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| Open AccessEvidence for two dimensional anisotropic Luttinger liquids at millikelvin temperatures
Recently, a Luttinger liquid state was reported in a moiré superlattice of bilayer tungsten ditelluride at small twist angles and temperatures of a few kelvins. Here, the authors extend this result to millikelvin temperatures, supporting the existence of the 2D anisotropic Luttinger liquid as a stable ground state.
- Guo Yu
- , Pengjie Wang
- & Sanfeng Wu
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Article
| Open AccessEvidence for ground state coherence in a two-dimensional Kondo lattice
Recently the Kondo effect has been observed in transition metal dichalcogenide heterobilayers, but the evidence for low-temperature coherent state has been missing. Wan et al. observe signatures of such state in the form of a split Kondo peak with a characteristic magnetic-field dependence by STM at 340 mK.
- Wen Wan
- , Rishav Harsh
- & Miguel M. Ugeda
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| Open AccessScreening the Coulomb interaction leads to a prethermal regime in two-dimensional bad conductors
Many-body localization is observed in synthetic systems, but experiments on real materials with Coulomb interactions are vital for insights in higher dimensions. Stanley et al. report a prethermal regime in the dynamics of a 2D disordered electron system in Si MOSFETs and explore the effects of interaction range.
- L. J. Stanley
- , Ping V. Lin
- & Dragana Popović
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Article
| Open Access0D van der Waals interfacial ferroelectricity
Down-scaled ferroelectricity normally diminishes due to the arising depolarization field. Here, the authors realize a 0D ferroelectric diode device taking advantage of the sliding at the van der Waals interface by the two crossed tungsten disulfide nanotubes.
- Yue Niu
- , Lei Li
- & Yao Guo
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Article
| Open AccessRobust 2D layered MXene matrix–boron carbide hybrid films for neutron radiation shielding
There is an urgent need to develop coatings with good neutron-absorption capacity and workability. Here the authors addressed these challenges by developing a scalable and solution processable two-dimensional Ti3C2Tx MXene hybrid film with homogeneously distributed B4C particles.
- Ju-Hyoung Han
- , Shi-Hyun Seok
- & Soon-Yong Kwon
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Article
| Open AccessPrecise synthetic control of exclusive ligand effect boosts oxygen reduction catalysis
Deconvoluting and quantitating ligand effect from the typical strain-ligand effects in a real catalytic structure remains challenging. Here, the authors report a core/shell catalyst model to quantitate how much ligand effect solely contributes to electrocatalytic performance through experimental design.
- Lu Tao
- , Kai Wang
- & Shaojun Guo
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Article
| Open AccessMicrowave-induced conductance replicas in hybrid Josephson junctions without Floquet—Andreev states
The authors study conductance replicas emerging under microwave irradiation in the tunnelling spectrum of Josephson junctions in InAs/Al heterostructures, focusing on distinguishing the signatures of Floquet-Andreev states (FASs) from those of photon-assisted tunneling (PAT). They establish that PAT largely dominates the response to microwave radiation in their device.
- Daniel Z. Haxell
- , Marco Coraiola
- & Fabrizio Nichele
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Matters Arising
| Open AccessReassessing the existence of soft X-ray correlated plasmons
- Mohsen Moazzami Gudarzi
- & Seyed Hamed Aboutalebi
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Matters Arising
| Open AccessReply to: Reassessing the existence of soft X-ray correlated plasmons
- T. J. Whitcher
- , A. D. Fauzi
- & A. Rusydi
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Article
| Open AccessMulti-scale molecular dynamics simulations of enhanced energy transfer in organic molecules under strong coupling
Placing an organic material in an optical cavity can enhance exciton transport, but the mechanism is poorly understood. Here, using molecular dynamics simulations, the authors obtained atomistic insights into that mechanism.
- Ilia Sokolovskii
- , Ruth H. Tichauer
- & Gerrit Groenhof
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Article
| Open AccessColossal negative magnetoresistance in field-induced Weyl semimetal of magnetic half-Heusler compound
Half-Heusler alloys containing rare earth ions have attracted interest due to combination of band-inversion and magnetism. Ueda et al study less studied trivial semiconductor HoAuSn, and show that it undergoes a magnetic field induced transition to a Weyl semimetal state, with a large reduction in the resistance.
- Kentaro Ueda
- , Tonghua Yu
- & Yoshinori Tokura
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Article
| Open AccessModulation-doping a correlated electron insulator
The metal-insulator transition in VO2 is concomitant with the structural transition, making purely electrical control challenging. Here the authors use a modulation-doped heterostructure to demonstrate modulation of the transition temperature with doping, without introducing structural changes.
- Debasish Mondal
- , Smruti Rekha Mahapatra
- & Naga Phani B. Aetukuri
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Article
| Open AccessVisualizing symmetry-breaking electronic orders in epitaxial Kagome magnet FeSn films
The Kagome lattice consists of equilateral triangles occupying each edge of a hexagon, resembling a star with six-fold rotation symmetry. Here, using scanning tunnelling microscopy, Zhang et al observe the breaking of this six-fold rotation symmetry in the Kagome lattice plane of the planar antiferromagnet, FeSn.
- Huimin Zhang
- , Basu Dev Oli
- & Lian Li
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Article
| Open AccessSignature of spin-phonon coupling driven charge density wave in a kagome magnet
The interplay between magnetism and charge density wave in the kagome magnet FeGe is under debate. By using elastic and inelastic X-ray scattering, angle-resolved photoemission spectroscopy, and first principles calculations, Miao et al. propose that the charge density wave is stabilized by spin-phonon coupling.
- H. Miao
- , T. T. Zhang
- & H. N. Lee
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Article
| Open AccessStrain control of a bandwidth-driven spin reorientation in Ca3Ru2O7
Ca3Ru2O7 is a layered ruthenate, which undergoes a spin-reorientation transition where the spins rotate 90 degrees between two anti-ferromagnetic states. Despite extensive study, the driver of this transition has proved elusive. Here, using neutron and resonant x-ray scattering, Dashwood et al. show that this transition is driven by lattice strain.
- C. D. Dashwood
- , A. H. Walker
- & D. F. McMorrow
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Article
| Open AccessBroad and colossal edge supercurrent in Dirac semimetal Cd3As2 Josephson junctions
The non-Hermitian skin effect, or localization of eigenstates at the boundary of a non-Hermitian system, has been intensively studied. Chu et al. observe a large and wide edge supercurrent in the Dirac semimetal Cd3As2-based Josephson junctions, which is consistent with the non-Hermitian skin effect.
- Chun-Guang Chu
- , Jing-Jing Chen
- & Zhi-Min Liao
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Article
| Open AccessRealization of an inherent time crystal in a dissipative many-body system
Physical realizations of time crystals, non-equilibrium many-body systems with broken time-translation symmetry, typically require periodic driving. Here the authors demonstrate a time crystal without external periodic drive in a collection of erbium atoms under a continuous laser excitation.
- Yu-Hui Chen
- & Xiangdong Zhang
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Article
| Open AccessBallistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2
By combining graphene with transition metal dichalcogenides, such as WSe2, it is possible to induce a large spin-orbit interaction in the graphene layer. Here, Rao et al study the spin-orbit coupling in graphene/WSe2 heterostructures using the ballistic transport based technique, known transverse magnetic focusing.
- Qing Rao
- , Wun-Hao Kang
- & Dong-Keun Ki
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Article
| Open AccessEncoding multistate charge order and chirality in endotaxial heterostructures
Phase transitions in charge density wave materials could be useful for memory and electronic device applications. Here, the authors correlate the temperature-driven transitions in the electrical and optical properties of H-TaS2/1T-TaS2 heterostructures to the number of endotaxial metallic H-TaS2 monolayers.
- Samra Husremović
- , Berit H. Goodge
- & D. Kwabena Bediako
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Article
| Open AccessSpatiotemporal observation of quantum crystallization of electrons
The understanding of quantum effects in electronic crystallization is limited. Murase et al. report spatio-temporal dynamics in an organic material, with distinct nucleation and growth signatures, demonstrating larger growth rates than in the classical case due to quantum nature of electrons.
- Hideaki Murase
- , Shunto Arai
- & Kazushi Kanoda
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Article
| Open AccessManipulation of nonlinear optical responses in layered ferroelectric niobium oxide dihalides
This paper reports the intralayer ferroelectric-to-antiferroelectric and ferroelectric-toparaelectric phase transitions in layered NbOCl2 and NbOI2 under a small pressure, respectively, along with the strong manipulations of nonlinear optics.
- Liangting Ye
- , Wenju Zhou
- & Bing Huang
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| Open AccessStrong electron-phonon coupling driven pseudogap modulation and density-wave fluctuations in a correlated polar metal
Electronic bandwidth modulation by static pressure has been explored in several material families. Wang et al. use temperature-dependent Raman spectroscopy and density functional theory to reveal phonon-driven modulation of electronic pseudogap and density wave fluctuations in a ruthenate Ca3Ru2O7.
- Huaiyu (Hugo) Wang
- , Yihuang Xiong
- & Venkatraman Gopalan
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Article
| Open AccessCharge density wave surface reconstruction in a van der Waals layered material
Recent work has reported puzzling results on the surface of 1T-TaS2. Based on first-principles calculations, the authors show that charge density wave order undergoes surface reconstruction, leading to modifications in the surface electronic structure, which can explain recent experiments.
- Sung-Hoon Lee
- & Doohee Cho
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Article
| Open AccessBroad-high operating temperature range and enhanced energy storage performances in lead-free ferroelectrics
One of the key challenges in dielectric ceramics for energy storage lies in the comprehensive optimization of their properties. Here, the authors establish an equitable system considering performance and structure evolution in a lead-free ceramic capacitor, achieving a broad-high temperature performance.
- Weichen Zhao
- , Diming Xu
- & Di Zhou
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Article
| Open AccessInterplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
Here, the authors observe that valley-polarized dark excitons in monolayer WSe2 show a distinct doping dependence when the carriers reach a critical density. This is indicative of the onset of strongly modified Fermi sea interactions.
- Xin Cong
- , Parisa Ali Mohammadi
- & Xiao-Xiao Zhang
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Article
| Open AccessDirected exciton transport highways in organic semiconductors
Optical properties of organic semiconductors enable various optoelectronic applications. Müller et al. report a large exciton bandwidth in a crystalline organic material and attribute it to the strong Coulomb interaction in directed exciton pathways induced by the donor–acceptor type molecular structure.
- Kai Müller
- , Karl S. Schellhammer
- & Frank Ortmann
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Article
| Open AccessAn anisotropic van der Waals dielectric for symmetry engineering in functionalized heterointerfaces
Here, the authors demonstrate that a layered anisotropic dielectric material, SiP2, can break the rotational symmetry of 2D MoS2, leading to linearly polarized photoluminescence emission and conductance anisotropy ratios up to 1000 in gated SiP2/MoS2 heterostructures.
- Zeya Li
- , Junwei Huang
- & Hongtao Yuan
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Article
| Open AccessSynergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures
Here, the authors theoretically predict the formation of synergistic correlated and topological states in Coulomb-coupled and gate-tunable graphene/insulator heterostructures, proposing a number of promising substrate candidates and a possible explanation for recent experimental observations in graphene/CrOCl heterostructures.
- Xin Lu
- , Shihao Zhang
- & Jianpeng Liu
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Article
| Open AccessAn electronic origin of charge order in infinite-layer nickelates
Recent experiments reported charge order with a stripe pattern in parent compounds of infinite-layer nickelate superconductors. Chen et al. use first principles and effective model calculations to propose an electronic, charge-transfer-driven mechanism of the charge order.
- Hanghui Chen
- , Yi-feng Yang
- & Hongquan Liu
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Article
| Open AccessFrom Stoner to local moment magnetism in atomically thin Cr2Te3
Over the last few years, several van der Waals materials have been found that retain magnetic ordering down to monolayer thickness. These materials provide a simple platform for studying the magnetism in reduced dimensions. Here, Zhong et al study the thickness dependence of magnetic ordering in Cr2Te3, and find a crossover from Stoner to Heisenberg-type magnetism as thicknesses are reduced.
- Yong Zhong
- , Cheng Peng
- & Zhi-Xun Shen
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Article
| Open AccessUncovering spin-orbit coupling-independent hidden spin polarization of energy bands in antiferromagnets
A hidden effect can occur in materials where locally a symmetry is broken, even though global symmetry is preserved. An example is hidden spin-polarization, arising from local inversion symmetry breaking in otherwise globally centro-symmetric materials. Here, Yuan et al uncover a hidden spin-polarization that can occur in antiferromagnets without spin-orbit coupling and identify the key material requirements for this to occur.
- Lin-Ding Yuan
- , Xiuwen Zhang
- & Alex Zunger
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Article
| Open AccessResonating holes vs molecular spin-orbit coupled states in group-5 lacunar spinels
Dressing is a concept used to describe moderately interacting electrons. Here authors present the notion of dressed spin-orbit 3/2 moments and how this picture breaks down with increasing electronic interactions across group-5 lacunar spinel magnets.
- Thorben Petersen
- , Pritam Bhattacharyya
- & Liviu Hozoi
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Article
| Open AccessDiscovery and construction of surface kagome electronic states induced by p-d electronic hybridization in Co3Sn2S2
Kagome materials host 2D planes which give rise to kagome physics, but these are typically embedded in the bulk. Huang et al. demonstrate a strategy for generating surface kagome electronic states by vertical p-d electronic hybridization between surface atoms and the buried Co kagome network in Co3Sn2S2.
- Li Huang
- , Xianghua Kong
- & Hong-Jun Gao
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Article
| Open AccessImpact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions
Many proposed spintronic devices, where spin, rather than charge is used for information processing, rely on the combination of multiple materials, for example, heavy metals and magnetic materials in spin-orbit torque devices. Here, Gao et al. show how the interface between a ferromagnet and a semimetal, Ni81Fe19/Bi0.1Sb0.9, can result in a barrier-mediated spin-orbit torques
- Tenghua Gao
- , Alireza Qaiumzadeh
- & Kazuya Ando
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Article
| Open AccessProminent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y
The authors investigate junctions made of two flakes of the cuprate superconductor Bi2Sr2-xLaxCuO6+y (Bi2201) twisted by 45 degrees. They find evidence for an isotropic pairing component, and call into question theoretical predictions of d+id superconductivity in this system.
- Heng Wang
- , Yuying Zhu
- & Qi-Kun Xue
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Article
| Open AccessMaterial symmetry recognition and property prediction accomplished by crystal capsule representation
Learning global crystal symmetry and interpreting equivariance are crucial for developing ML model to predict electronic properties. Here authors propose a symmetry-enhanced model to simulate cluster interactions and to predict materials properties.
- Chao Liang
- , Yilimiranmu Rouzhahong
- & Huashan Li
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Article
| Open AccessTopological soliton molecule in quasi 1D charge density wave
Soliton molecules have been observed only in the temporal dimension for classical wave optical systems. Here, the authors use scanning tunneling spectroscopy to identify a topological soliton molecule in real space in a quasi-1D charge-ordered phase of indium atomic wires.
- Taehwan Im
- , Sun Kyu Song
- & Han Woong Yeom
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Article
| Open AccessTransparent dynamic infrared emissivity regulators
In this work, authors report a transparent dynamic infrared emissivity modulation mechanism based on reversible injection/extraction of electrons in aluminium-doped zinc oxide nanocrystals and demonstrate it for smart thermal management applications.
- Yan Jia
- , Dongqing Liu
- & Tianwen Liu
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Article
| Open AccessProton-controlled molecular ionic ferroelectrics
Molecular ferroelectrics contain stimuli-responsive structure and ionic building blocks, promising for ionically tailored multifunctionality. Here, the authors report molecular ionic ferroelectrics exhibiting the coexistence of room-temperature ionic conductivity and ferroelectricity.
- Yulong Huang
- , Jennifer L. Gottfried
- & Shenqiang Ren
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Article
| Open AccessHeavy quasiparticles and cascades without symmetry breaking in twisted bilayer graphene
Twisted bilayer graphene hosts a sequence of electronic resets evidenced experimentally by characteristic spectroscopic cascades and sawtooth peaks in the inverse electronic compressibility. Here, the authors use combined dynamical mean-field theory and Hartree calculations to demonstrate that symmetry-breaking transitions are not necessary to observe cascades in twisted bilayer graphene.
- Anushree Datta
- , M. J. Calderón
- & E. Bascones
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Article
| Open AccessMachine learning the microscopic form of nematic order in twisted double-bilayer graphene
Machine learning methods in condensed matter physics are an emerging tool for providing powerful analytical methods. Here, the authors demonstrate that convolutional neural networks can identify nematic electronic order from STM data of twisted double-layer graphene—even in the presence of heterostrain.
- João Augusto Sobral
- , Stefan Obernauer
- & Mathias S. Scheurer
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Article
| Open AccessIonic liquid gating induced self-intercalation of transition metal chalcogenides
Transition metal monochalcogenides have been predicted to host interesting superconducting and topological properties, but their synthesis remains challenging. Here, the authors report a self-intercalation method driven by ionic liquid gating to obtain PdTe and NiTe single crystals from PdTe2 and NiTe2, respectively.
- Fei Wang
- , Yang Zhang
- & Shuyun Zhou
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Article
| Open AccessTowards layer-selective quantum spin hall channels in weak topological insulator Bi4Br2I2
Weak topological insulators offer promising topological state tunability for devices. Here, the authors use ARPES and first-principles calculations to evidence signatures of layer-selective quantum spin Hall channels that may be tunable with chemical potential for future applications.
- Jingyuan Zhong
- , Ming Yang
- & Yi Du
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Article
| Open AccessImproved figure of merit (z) at low temperatures for superior thermoelectric cooling in Mg3(Bi,Sb)2
It is challenging to increase carrier mobility in n-type Mg3(Bi,Sb)2 due to grain-boundary scattering. Here, authors reported a facile growth of coarse-grained Mg3(Bi,Sb)2 crystals with high carrier mobility. The as-fabricated module shows cooling performance comparable to commercial Bi2Te3 module.
- Nan Chen
- , Hangtian Zhu
- & Huaizhou Zhao
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Article
| Open AccessFlat bands, non-trivial band topology and rotation symmetry breaking in layered kagome-lattice RbTi3Bi5
Kagome superconductors are a platform for intertwined condensed matter phenomena that may be mediated by band topology. Here, authors use ARPES and DFT to identify type-II Dirac nodal lines, flat bands, topologically non-trivial surface states and signatures of nematicity in the kagome compound RbTi3Bi5.
- Zhicheng Jiang
- , Zhengtai Liu
- & Dawei Shen
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Article
| Open AccessHigh-energy photoemission final states beyond the free-electron approximation
Angular-resolved photoemission data is commonly used to determine the 3D electronic structure assuming free-electron final states. Strocov et al. show that even at high excitation energies the complexity of final states in various materials can go far beyond the free-electron picture.
- V. N. Strocov
- , L. L. Lev
- & J. Minár
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Article
| Open AccessAnomalous Landau quantization in intrinsic magnetic topological insulators
Tunability of the electronic properties of magnetic topological insulators is highly desired for future device applications. Here, the authors study the effect of substitutional impurities on the topological properties of Sb-doped MnBi2Te4 devices and uncover tunable layer-dependent electronic states.
- Su Kong Chong
- , Chao Lei
- & Kang L. Wang
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Article
| Open AccessExcitonic insulator to superconductor phase transition in ultra-compressed helium
Solid helium is predicted to become a metal at extraordinarily high pressures of 25 TPa. Here, the authors predict that helium becomes an excitonic insulator just below the metallization pressure, and a superconductor just above the metallization pressure.
- Cong Liu
- , Ion Errea
- & Claudio Cazorla
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Article
| Open AccessTuning electronic and phononic states with hidden order in disordered crystals
Hidden local order in disordered crystals is shown to have a strong impact on electronic and phononic band structures. Local correlations within hidden-order states can open band gaps, thereby changing properties without long-range symmetry breaking.
- Nikolaj Roth
- & Andrew L. Goodwin