Focus |

Condensed-Matter Physics

  • Nature Communications | Article | open

    Placement of charge centres with atomic precision on graphene allows exploration of new types of confinement of charge carriers. Here, the authors fabricate atomically precise arrays of point charges on graphene and observe the onset of a frustrated supercritical regime.

    • Jiong Lu
    • , Hsin-Zon Tsai
    • , Alpin N. Tatan
    • , Sebastian Wickenburg
    • , Arash A. Omrani
    • , Dillon Wong
    • , Alexander Riss
    • , Erik Piatti
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Alex Zettl
    • , Vitor M. Pereira
    •  &  Michael F. Crommie
  • Nature Communications | Article | open

    The observation of magnetic field dependence of defects hosted in hBN has been elusive so far. Here, the authors perform an investigation of spin-related effects in the optical emission from hBN defects, and observe a magnetic field dependence in the intensity of the photoluminescence spectrum.

    • Annemarie L. Exarhos
    • , David A. Hopper
    • , Raj N. Patel
    • , Marcus W. Doherty
    •  &  Lee C. Bassett
  • Nature Communications | Article | open

    The short exciton life time in atomically thin transition metal dichalcogenides poses limitations to efficient control of the valley pseudospin and coherence. Here, the authors manipulate the exciton coherence in a WSe2 monolayer embedded in an optical microcavity in the strong light-matter coupling regime.

    • S. Dufferwiel
    • , T. P. Lyons
    • , D. D. Solnyshkov
    • , A. A. P. Trichet
    • , A. Catanzaro
    • , F. Withers
    • , G. Malpuech
    • , J. M. Smith
    • , K. S. Novoselov
    • , M. S. Skolnick
    • , D. N. Krizhanovskii
    •  &  A. I. Tartakovskii
  • Nature Communications | Article | open

    Quantitative analysis of the extinction spectra of dispersions of 2D materials is complicated by light scattering. Here, the authors investigate non-resonant scattering in suspensions of wide-bandgap nanosheets, and develop a general model which allows the scattering spectra to be used as metrics for particle size in nanosheet dispersions.

    • Andrew Harvey
    • , Claudia Backes
    • , John B. Boland
    • , Xiaoyun He
    • , Aideen Griffin
    • , Beata Szydlowska
    • , Cian Gabbett
    • , John F. Donegan
    •  &  Jonathan N. Coleman
  • Nature Communications | Article | open

    Encapsulated graphene Josephson junctions are promising for microwave quantum circuits but so far haven’t been explored. Here, Schmidt and Jenkins et al. observe a gate-tunable Josephson inductance in a microwave circuit based on a ballistic graphene Josephson junction embedded in a superconducting cavity.

    • Felix E. Schmidt
    • , Mark D. Jenkins
    • , Kenji Watanabe
    • , Takashi Taniguchi
    •  &  Gary A. Steele
  • Nature Communications | Article | open

    High-order correlated states in atomically thin transition metal dichalcogenides may be facilitated by long-lived optically dark excitons. Here, the authors report experimentally the emergence of neutral and charged biexciton species at low light intensities in encapsulated WSe2 monolayers.

    • Ziliang Ye
    • , Lutz Waldecker
    • , Eric Yue Ma
    • , Daniel Rhodes
    • , Abhinandan Antony
    • , Bumho Kim
    • , Xiao-Xiao Zhang
    • , Minda Deng
    • , Yuxuan Jiang
    • , Zhengguang Lu
    • , Dmitry Smirnov
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , James Hone
    •  &  Tony F. Heinz
  • Nature Communications | Article | open

    The optical properties of nanographenes can be engineered by designing their size, shape, and edges. Here, the authors show that graphene quantum dots are single photon emitters at room temperature, and their emission wavelength can be controlled by edge functionalization.

    • Shen Zhao
    • , Julien Lavie
    • , Loïc Rondin
    • , Lucile Orcin-Chaix
    • , Carole Diederichs
    • , Philippe Roussignol
    • , Yannick Chassagneux
    • , Christophe Voisin
    • , Klaus Müllen
    • , Akimitsu Narita
    • , Stéphane Campidelli
    •  &  Jean-Sébastien Lauret
  • Nature Communications | Article | open

    Atomically thin transition metal dichalcogenides offer a platform to explore the valley degree of freedom originating from their electronic band structure. Here, the authors use polarization- and time-resolved spectroscopy to investigate the temperature-dependent valley pseudospin relaxation processes in WSe2 monolayers.

    • Yuhei Miyauchi
    • , Satoru Konabe
    • , Feijiu Wang
    • , Wenjin Zhang
    • , Alexander Hwang
    • , Yusuke Hasegawa
    • , Lizhong Zhou
    • , Shinichiro Mouri
    • , Minglin Toh
    • , Goki Eda
    •  &  Kazunari Matsuda
  • Nature Communications | Article | open

    Hexagonal boron nitride (hBN) is a layered van der Waals material showing promise for nanophotonics. Here, the authors design hBN photonic crystal cavities with quality factors exceeding 2000, and further demonstrate deterministic tuning of individual cavities by minimally-invasive electron beam induced etching.

    • Sejeong Kim
    • , Johannes E. Fröch
    • , Joe Christian
    • , Marcus Straw
    • , James Bishop
    • , Daniel Totonjian
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Milos Toth
    •  &  Igor Aharonovich
  • Nature Communications | Article | open

    The wide application of wireless communications in various technologies calls for the development of robust yet compact radio-frequency switches. Here, Kim et al. utilize MoS2 based non-volatile memristors to switch up to THz frequencies in sub µm2 areas, whilst the switches consume zero-static energy.

    • Myungsoo Kim
    • , Ruijing Ge
    • , Xiaohan Wu
    • , Xing Lan
    • , Jesse Tice
    • , Jack C. Lee
    •  &  Deji Akinwande
  • Nature Communications | Article | open

    Observing and tuning the Kondo effect in graphene is experimentally challenging. Here, the authors identify the spectroscopic signature of Kondo screening in graphene, along with a quantum phase transition between screened and unscreened phases of vacancy magnetic moments.

    • Yuhang Jiang
    • , Po-Wei Lo
    • , Daniel May
    • , Guohong Li
    • , Guang-Yu Guo
    • , Frithjof B. Anders
    • , Takashi Taniguchi
    • , Kenji Watanabe
    • , Jinhai Mao
    •  &  Eva Y. Andrei
  • Nature Communications | Article | open

    The interplay between strong interactions and presence of disorder makes atomically thin transition metal dichalcogenides an ideal platform to study phase transitions and critical phenomena. Here, the authors observe asymmetric critical exponents around the metal-insulator-transition of multilayer MoS2.

    • Byoung Hee Moon
    • , Jung Jun Bae
    • , Min-Kyu Joo
    • , Homin Choi
    • , Gang Hee Han
    • , Hanjo Lim
    •  &  Young Hee Lee
  • Nature Communications | Article | open

    The investigation into the dynamical transitions of charged quasiparticles on interfaces remains technically challenging. Here, the authors use ultrafast, mid-infrared micro-spectroscopy to unveil the formation of tightly bound interlayer excitons between conducting graphene and semiconducting MoSe2.

    • Xiewen Wen
    • , Hailong Chen
    • , Tianmin Wu
    • , Zhihao Yu
    • , Qirong Yang
    • , Jingwen Deng
    • , Zhengtang Liu
    • , Xin Guo
    • , Jianxin Guan
    • , Xiang Zhang
    • , Yongji Gong
    • , Jiangtan Yuan
    • , Zhuhua Zhang
    • , Chongyue Yi
    • , Xuefeng Guo
    • , Pulickel M. Ajayan
    • , Wei Zhuang
    • , Zhirong Liu
    • , Jun Lou
    •  &  Junrong Zheng
  • Nature Communications | Article | open

    In two-dimensional semiconductors excitons are strongly bound, suppressing the creation of free carriers. Here, the authors investigate the main exciton dissociation pathway in p-n junctions of monolayer WSe2 by means of time and spectrally resolved photocurrent measurements.

    • Mathieu Massicotte
    • , Fabien Vialla
    • , Peter Schmidt
    • , Mark B. Lundeberg
    • , Simone Latini
    • , Sten Haastrup
    • , Mark Danovich
    • , Diana Davydovskaya
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Vladimir I. Fal’ko
    • , Kristian S. Thygesen
    • , Thomas G. Pedersen
    •  &  Frank H. L. Koppens
  • Nature Communications | Article | open

    Ultra-compact phonon polariton devices may benefit from the atomically thin nature of van der Waals materials. Here, the authors report that atomically 2D transition metal dichalcogenides on a silicon carbide substrate support a 190-fold confinement of propagating surface phonon polaritons.

    • Alexander M. Dubrovkin
    • , Bo Qiang
    • , Harish N. S. Krishnamoorthy
    • , Nikolay I. Zheludev
    •  &  Qi Jie Wang
  • Nature Communications | Article | open

    The fabrication of van der Waals heterostructures of atomically thin materials often relies on the search, manual transferring, and alignment of suitable flakes. Here, the authors develop a robotic system capable of identifying exfoliated 2D crystals and assembling them in complex heterostructures.

    • Satoru Masubuchi
    • , Masataka Morimoto
    • , Sei Morikawa
    • , Momoko Onodera
    • , Yuta Asakawa
    • , Kenji Watanabe
    • , Takashi Taniguchi
    •  &  Tomoki Machida
  • Nature Communications | Article | open

    Valleytronics leverages the valley degree of freedom to engineer light-matter interaction. Here, the authors demonstrate a room temperature, bias-free valley effect in bulk SnS by means of spectroscopic measurements, previously unattainable using atomically thin transition metal dichalcogenides.

    • Shuren Lin
    • , Alexandra Carvalho
    • , Shancheng Yan
    • , Roger Li
    • , Sujung Kim
    • , Aleksandr Rodin
    • , Lídia Carvalho
    • , Emory M. Chan
    • , Xi Wang
    • , Antonio H. Castro Neto
    •  &  Jie Yao
  • Nature Communications | Article | open

    Conductance quantization is the hallmark of non-interacting confined systems. The authors show that the quantization in graphene nanoconstrictions with low edge disorder is suppressed in the quantum Hall regime. This is explained by the addition of new conductance channels due to electrostatic screening.

    • José M. Caridad
    • , Stephen R. Power
    • , Mikkel R. Lotz
    • , Artsem A. Shylau
    • , Joachim D. Thomsen
    • , Lene Gammelgaard
    • , Timothy J. Booth
    • , Antti-Pekka Jauho
    •  &  Peter Bøggild
  • Nature Communications | Article | open

    Atomically thin monolayers with high photoluminescence quantum yield are promising for optoelectronic and lighting applications. Here, the authors fabricate a transient-mode electroluminescent device to bypass the requirement of ohmic contacts for electrons and holes, and observe millimetre-scale light emission from a transparent 2D display.

    • Der-Hsien Lien
    • , Matin Amani
    • , Sujay B. Desai
    • , Geun Ho Ahn
    • , Kevin Han
    • , Jr-Hau He
    • , Joel W. Ager III
    • , Ming C. Wu
    •  &  Ali Javey
  • Nature Communications | Article | open

    Owing to their valley degree of freedom, atomically thin transition metal dichalcogenides show promise for valleytronics. Here, the authors leverage the dark excitons of two-dimensional van der Waals heterostructures to demonstrate a microsecond valley polarization memory effect.

    • Chongyun Jiang
    • , Weigao Xu
    • , Abdullah Rasmita
    • , Zumeng Huang
    • , Ke Li
    • , Qihua Xiong
    •  &  Wei-bo Gao
  • Nature Communications | Article | open

    Strain is an effective tool to tune the optoelectronic properties of two-dimensional materials. Here, the authors demonstrate that second harmonic generation can be used to extract the full strain tensor of MoS2 and to spatially image its two-dimensional strain field.

    • Lukas Mennel
    • , Marco M. Furchi
    • , Stefan Wachter
    • , Matthias Paur
    • , Dmitry K. Polyushkin
    •  &  Thomas Mueller
  • Nature Communications | Article | open

    Graphene possesses a nonlinear optical response arising from its electronic dispersion. Here, the authors measure the response of graphene to an ultrafast optical field and provide an explanation of the quantum dynamics of Dirac carriers mediating the material’s nonlinear response.

    • Matthias Baudisch
    • , Andrea Marini
    • , Joel D. Cox
    • , Tony Zhu
    • , Francisco Silva
    • , Stephan Teichmann
    • , Mathieu Massicotte
    • , Frank Koppens
    • , Leonid S. Levitov
    • , F. Javier García de Abajo
    •  &  Jens Biegert
  • Nature Communications | Article | open

    Owing to its long spin diffusion length, graphene shows promise for spintronics applications, especially when encapsulated within hexagonal boron nitride. Here, the authors demonstrate gate-tunable spin transport in encapsulated graphene-based spin valves with one-dimensional ferromagnetic edge contacts via magnetic proximity effect.

    • Jinsong Xu
    • , Simranjeet Singh
    • , Jyoti Katoch
    • , Guanzhong Wu
    • , Tiancong Zhu
    • , Igor Žutić
    •  &  Roland K. Kawakami
  • Nature Communications | Article | open

    Understanding of ordered phases of interacting electrons in 2D systems is a fundamental many-body physics problem. Here, the authors report unconventional fractional quantum Hall phases in graphene Corbino devices originating from residual interactions of composite fermions in partially filled higher Landau levels. They also demonstrate the exceptional strength of the Coulomb interactions in suspended graphene by reaching the field-induced Wigner crystal state.

    • Manohar Kumar
    • , Antti Laitinen
    •  &  Pertti Hakonen