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Ultrafast photoluminescence and multiscale light amplification in nanoplasmonic cavity glass
This article presents a unique nanocomposite plasmonic-excitonic glass with extraordinary amplified optical properties: ultra-narrow photoluminescence (FWHM = 13 nm) and ultrashort photoluminescence lifetime (90 ps) at room temperature
- Piotr Piotrowski
- , Marta Buza
- & Dorota A. Pawlak
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| Open Access
All-silicon multidimensionally-encoded optical physical unclonable functions for integrated circuit anti-counterfeiting
The researchers introduce an all-silicon optical PUF that enhances IoT device security through CMOS-compatible fabrication, showcasing five unique optical responses per pixel for advanced authentication and high information entropy.
- Kun Wang
- , Jianwei Shi
- & Deren Yang
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Halogen doped graphene quantum dots modulate TDP-43 phase separation and aggregation in the nucleus
Modulating amyloid protein phase separation and fibrilization may help in addressing neurodegenerative diseases. This study demonstrates that halogen-doped graphene quantum dots can modulate these processes in TDP-43 in both nucleus and cytoplasm.
- Hong Zhang
- , Huazhang Guo
- & Bin Dai
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Tailoring coordination environments of single-atom electrocatalysts for hydrogen evolution by topological heteroatom transfer
The rational design of carbon-supported transition metal single atom catalysts with precise coordination tailoring remains challenging. Here, the authors develop a topological heteroatom-transfer strategy to precisely control the P coordination in Co single atoms for hydrogen evolution.
- Sheng Qian
- , Feng Xu
- & Jingqi Tian
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Machine-learning-assisted and real-time-feedback-controlled growth of InAs/GaAs quantum dots
Finding the process parameters in molecular beam epitaxy for a specific density of quantum dots is a multidimensional optimization challenge. Here, the authors demonstrate real-time feedback controlled self-assembled InAs/GaAs QDs growth based on machine learning (ML) outputs.
- Chao Shen
- , Wenkang Zhan
- & Zhanguo Wang
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Photooxidation triggered ultralong afterglow in carbon nanodots
Biocompatible afterglow materials have potential in imaging applications, but are challenging to prepare. Here the authors report the development of carbon nanodots with near-infrared afterglow, and demonstrate their use in imaging for tumour resection.
- Guang-Song Zheng
- , Cheng-Long Shen
- & Chong-Xin Shan
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Real-time two-axis control of a spin qubit
Real-time adaptive control of a qubit has been demonstrated but limited to single-axis Hamiltonian estimation. Here the authors implement two-axis control of a singlet-triplet spin qubit with two fluctuating Hamiltonian parameters, resulting in improved quality of coherent oscillations.
- Fabrizio Berritta
- , Torbjørn Rasmussen
- & Ferdinand Kuemmeth
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Insights into structural defect formation in individual InP/ZnSe/ZnS quantum dots under UV oxidation
InP/ZnSe/ZnS quantum dots (QDs) are promising candidates for advanced light-emitting diodes, but low emission efficiency due to oxidation hampers applications. Here, the authors provide insight into the structural defects that form on individual QDs during UV-facilitated oxidation.
- Hayeon Baek
- , Sungsu Kang
- & Jungwon Park
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Spontaneous crystallization of strongly confined CsSnxPb1-xI3 perovskite colloidal quantum dots at room temperature
Photoactive pure-iodine all-inorganic colloidal perovskite quantum dots (QDs) are attractive for optoelectronic applications, however their synthesis at room temperature is challenging. Here the authors report a room temperature strongly confined strategy to synthesize CsSnxPb1-xI3 QDs.
- Louwen Zhang
- , Hai Zhou
- & Guojia Fang
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Spin-EPR-pair separation by conveyor-mode single electron shuttling in Si/SiGe
Electron charge and spin shuttling is a promising technique for connecting distant spin qubits. Here the authors use conveyor-mode shuttling to achieve high-fidelity transport of a single electron spin in Si/SiGe by separation and rejoining of two spin-entangled electrons across a shuttling distance of 560 nm.
- Tom Struck
- , Mats Volmer
- & Lars R. Schreiber
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Approaching a fully-polarized state of nuclear spins in a solid
Highly polarized nuclear spins can supress decoherence of electron spin qubits, but this requires near-unity polarization. Here the authors implement a protocol combining optical excitation and fast carrier tunnelling to achieve nuclear spin polarizations above 95% in GaAs quantum dots on a timescale of 1 minute.
- Peter Millington-Hotze
- , Harry E. Dyte
- & Evgeny A. Chekhovich
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| Open Access
Giant optical polarisation rotations induced by a single quantum dot spin
Light-matter interfaces implementing arbitrary conditional operations on incoming photons would have several applications in quantum computation and communications. Here, the authors demonstrate conditional polarization rotation induced by a single quantum dot spin embedded in an electrically contacted micropillar, spanning up to a pi flip.
- E. Mehdi
- , M. Gundín
- & L. Lanco
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The role of ion migration, octahedral tilt, and the A-site cation on the instability of Cs1-xFAxPbI3
Applications of perovskite solar cells have been hindered by ion migration and structural instability. Here, the authors use ultra-low dose transmission electron microscopy to reveal the process of ion migration and structural change at the atomic level in Cs1-xFAxPbI3.
- Weilun Li
- , Mengmeng Hao
- & Joanne Etheridge
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Coherent light scattering from a telecom C-band quantum dot
Developing quantum networks would require reliable sources of coherent quantum light at telecom wavelengths. Here, the authors employ elastic scattering of excitation laser photons on InAs/InP quantum dots to demonstrate the emission of telecom photons with coherence times longer than the Fourier limit.
- L. Wells
- , T. Müller
- & A. J. Shields
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Coherent charge oscillations in a bilayer graphene double quantum dot
Graphene quantum dots promise applications for spin and valley qubits; however a demonstration of phase coherent oscillations has been lacking. Here the authors report coherent charge oscillations and measurements of coherence times in highly tuneable double quantum dots in bilayer graphene.
- K. Hecker
- , L. Banszerus
- & C. Stampfer
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Cryogenic multiplexing using selective area grown nanowires
The authors demonstrate a large ensemble of quantum dots which is characterized using a cryogenic multiplexer-demultiplexer circuit based on selective area growth nanowires, establishing the feasibility of scaling future quantum circuits.
- Dāgs Olšteins
- , Gunjan Nagda
- & Thomas S. Jespersen
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Single PbS colloidal quantum dot transistors
Colloidal quantum dots remain unexplored for applications in single-electron devices. Here, the authors demonstrate single-electron transistors using single PbS colloidal quantum dot, highlighting their room-temperature operation.
- Kenji Shibata
- , Masaki Yoshida
- & Yoshihiro Iwasa
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In situ imaging of the atomic phase transition dynamics in metal halide perovskites
Phase transition dynamics are an important concern in the wide applications of metal halide perovskites. Here authors apply low-dose imaging technique to reveal the phase transition dynamics of CsPbI3 during in-situ heating process with atomic resolution.
- Mengmeng Ma
- , Xuliang Zhang
- & Boyuan Shen
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Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices
Andreev bound states can form in hybrid semiconducting-superconducting devices and can mirror the experimental signatures of the much sought topologically non-trivial Majorana bound states. Here, van Driel, Wang and coauthors present a method of directly measuring the spin-polarized excitation spectrum of Andreev bound states.
- David van Driel
- , Guanzhong Wang
- & Tom Dvir
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Photoluminescence imaging of single photon emitters within nanoscale strain profiles in monolayer WSe2
Here, the authors correlate the position and spectral emission properties of single photon emitters in monolayer WSe2 with the surrounding local strain potential by combining deep-subwavelength photoluminescence imaging and atomic force microscopy, providing insights on the microscopic mechanisms behind the formation of the quantum emitters.
- Artem N. Abramov
- , Igor Y. Chestnov
- & Vasily Kravtsov
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Location-selective immobilisation of single-atom catalysts on the surface or within the interior of ionic nanocrystals using coordination chemistry
The authors report the location-selective immobilisation of single Pt atoms on the surface or within the interior of CdSe nanoplatelets using coordination chemistry and show location-dependent photocatalytic reactivity.
- Kenichi Endo
- , Masaki Saruyama
- & Toshiharu Teranishi
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Coherent heteroepitaxial growth of I-III-VI2 Ag(In,Ga)S2 colloidal nanocrystals with near-unity quantum yield for use in luminescent solar concentrators
Colloidal semiconductor core-shell nanocrystals are sought after for photonic applications. Here, the authors report coherent heteroepitaxial growth of Ag(In,Ga)S2 core-shell nanocrystals with near-unity photoluminescence quantum yield across almost the full visible range.
- Hak June Lee
- , Seongbin Im
- & Wan Ki Bae
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Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold
As the size of quantum processors scales up, accurate characterization of errors due to various crosstalks between qubits becomes important. Here the authors use a novel benchmarking protocol to study single-gate fidelities in a 2x2 hole spin qubit array in germanium when qubits are driven simultaneously.
- W. I. L. Lawrie
- , M. Rimbach-Russ
- & M. Veldhorst
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Incoherent nonadiabatic to coherent adiabatic transition of electron transfer in colloidal quantum dot molecules
The transition between nonadiabatic and adiabatic electron transfer regimes has been observed in molecular donor-bridge-acceptor complexes. Here, the authors computationally show how to control this transition in colloidal quantum dot molecules and achieve coherent electron transfer at room temperature.
- Bokang Hou
- , Michael Thoss
- & Eran Rabani
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Enabling metallic behaviour in two-dimensional superlattice of semiconductor colloidal quantum dots
Charge carrier transport in colloidal quantum dot assemblies is slow due to hopping transport nature. Here, the authors report the demonstration of gate-tuned metallic state in epitaxially-connected quantum dot superlattices by minimizing disorders.
- Ricky Dwi Septianto
- , Retno Miranti
- & Satria Zulkarnaen Bisri
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Wigner-molecularization-enabled dynamic nuclear polarization
Wigner molecules, or correlated localized electron states, has been reported in semiconductor quantum dots, but their interaction with environment has been less explored. Here the authors use the spin multiplet structure of a three-electron Wigner molecule to enhance and control dynamic nuclear polarization.
- Wonjin Jang
- , Jehyun Kim
- & Dohun Kim
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Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot
Interaction between localized electron spins and nuclear spins causes shifts in nuclear spin energy levels, but how this affects nuclear spin diffusion in quantum dots is not fully understood. Here the authors show that the central electron accelerates nuclear spin diffusion in GaAs/AlGaAs quantum dots.
- Peter Millington-Hotze
- , Santanu Manna
- & Evgeny A. Chekhovich
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Direct nano-imaging of light-matter interactions in nanoscale excitonic emitters
Authors investigate quasi-2D nanoscale emitters on different substrates with tapping mode tip-enhanced spectroscopy. They visualize in-plane near-field and radiative energy propagation via Surface plasmon polaritons launched by the nanoscale emitters on dielectric/Au or SiO2/Si substrates.
- Kiyoung Jo
- , Emanuele Marino
- & Deep Jariwala
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Zero-field quantum beats and spin decoherence mechanisms in CsPbBr3 perovskite nanocrystals
Lead halide perovskites host bright triplet excitons which have applications in optospintronic devices. Here the authors observe quantum coherence between exciton sublevels without magnetic field and clarify the mechanisms of exciton spin relaxation in ensembles of CsPbBr3 nanocrystals.
- Rui Cai
- , Indrajit Wadgaonkar
- & Tze Chien Sum
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Thermal tolerance of perovskite quantum dots dependent on A-site cation and surface ligand
The lattice strain induced by surface ligands not only stabilizes black phase at room temperature but also enables full-range A-site tuning. Here, authors construct a detailed picture of temperature dependent behaviour of perovskite quantum dots by in situ spectroscopic and structural measurements.
- Shuo Wang
- , Qian Zhao
- & Guoran Li
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Reducing charge noise in quantum dots by using thin silicon quantum wells
Charge noise degrades the performance of spin qubits hindering scalability. Here the authors engineer the heterogeneous material stack in 28Si/SiGe gate-defined quantum dots, to improve the scattering properties and to reduce charge noise.
- Brian Paquelet Wuetz
- , Davide Degli Esposti
- & Giordano Scappucci
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Blue light-emitting diodes based on colloidal quantum dots with reduced surface-bulk coupling
The surface localized charges in colloidal quantum dots induce a degradation that limits the electroluminescence performance. Here, Chen et al. propose quantum dots with monmonotonically-graded core/shell/shell structures to boost the device’s performance by reducing the surface-bulk coupling.
- Xingtong Chen
- , Xiongfeng Lin
- & Song Chen
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Universal scaling laws for charge-carrier interactions with quantum confinement in lead-halide perovskites
Knowledge of fundamental properties of lead halide perovskites is crucial for their technological development. Here, authors perform magneto-optical spectroscopy, develop universal scaling laws and offer a predictive picture for interaction energies within photo-generated charge-carrier complexes.
- Philippe Tamarat
- , Elise Prin
- & Brahim Lounis
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Surface passivation of intensely luminescent all-inorganic nanocrystals and their direct optical patterning
All-inorganic nanocrystals are of great importance for a variety of electronic applications. Here, the authors use metal salts to remove organic ligands to obtain passivated nanocrystals with improved fluorescence yield for direct optical patterning.
- Pengwei Xiao
- , Zhoufan Zhang
- & Yuanyuan Wang
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Heteroepitaxial chemistry of zinc chalcogenides on InP nanocrystals for defect-free interfaces with atomic uniformity
Heteroepitaxy on colloidal nanocrystals often yields defective heterostructures due to intricate reaction pathways. Here, the authors decode the surface chemistry at the molecular level to realise defect-free interfaces with atomic uniformity.
- Yeongho Choi
- , Donghyo Hahm
- & Jaehoon Lim
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SiGe quantum wells with oscillating Ge concentrations for quantum dot qubits
Quantum-dot spin qubits in Si/SiGe quantum wells require a large and uniform valley splitting for robust operation and scalability. Here the authors introduce and characterize a new heterostructure with periodic oscillations of Ge atoms in the quantum well, which could enhance the valley splitting.
- Thomas McJunkin
- , Benjamin Harpt
- & M. A. Eriksson
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| Open Access
Atomic fluctuations lifting the energy degeneracy in Si/SiGe quantum dots
Spin qubits in Si/SiGe quantum dots suffer from variability in the valley splitting which will hinder device scalability. Here, by using 3D atomic characterization, the authors explain this variability by random Si and Ge atomic fluctuations and propose a strategy to statistically enhance the valley splitting
- Brian Paquelet Wuetz
- , Merritt P. Losert
- & Giordano Scappucci
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| Open Access
Ultra-low loss quantum photonic circuits integrated with single quantum emitters
Applications of ultra-low-loss photonic circuitry in quantum photonics, in particular including triggered single photon sources, are rare. Here, the authors show how InAs quantum dot single photon sources can be integrated onto wafer-scale, CMOS compatible ultra-low loss silicon nitride photonic circuits.
- Ashish Chanana
- , Hugo Larocque
- & Marcelo Davanco
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| Open Access
Arginine-modified black phosphorus quantum dots with dual excited states for enhanced electrochemiluminescence in bioanalysis
Electrochemiluminescence is emitted via the radiative transition of a singlet or triplet excited state. Here, the authors propose an arginine modification of black phosphorus quantum dots that exhibits enhanced emission based on dual excited states.
- Siqi Yu
- , Yu Du
- & Huangxian Ju
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Article
| Open Access
Emergence of distinct electronic states in epitaxially-fused PbSe quantum dot superlattices
Self-assembled PbSe quantum dot (QD) superlattices are a class of materials that promises novel mesoscale electronic properties due to electronic coupling between individual QDs. Here, the authors reveal distinct electronic states manifested by the quantum confinement of charge carriers in epitaxially formed necking between QDs.
- Mahmut S. Kavrik
- , Jordan A. Hachtel
- & Matt Law
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| Open Access
Direct in situ photolithography of perovskite quantum dots based on photocatalysis of lead bromide complexes
Perovskite nanomaterials may suffer degradation during conventional photolithography. Here, the authors report a non-destructive method for patterning perovskite quantum dots based on direct photopolymerization catalyzed by lead bromide complexes.
- Pingping Zhang
- , Gaoling Yang
- & Haizheng Zhong
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| Open Access
A shuttling-based two-qubit logic gate for linking distant silicon quantum processors
A coherent quantum link between distant quantum processors is desirable for scaling up of quantum computation. Noiri et al. demonstrate a strategy to link distant quantum processors in silicon, by implementing a shuttling-based two-qubit gate between spin qubits in a Si/SiGe triple quantum dot.
- Akito Noiri
- , Kenta Takeda
- & Seigo Tarucha
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| Open Access
Excitonic Bloch–Siegert shift in CsPbI3 perovskite quantum dots
Observation of a Bloch-Siegert shift has remained elusive. Here, Wu et al, reports spin-selective Bloch-Siegert shift in lead halide perovskite quantum dots, and highlights the importance of many-body interactions in correctly modeling the shift.
- Yuxuan Li
- , Yaoyao Han
- & Jingyi Zhu
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| Open Access
Double-crowned 2D semiconductor nanoplatelets with bicolor power-tunable emission
Nanocrystals are desirable light sources for advanced display technologies. Here, the authors report on double-crowned 2D semiconductor nanoplatelets as light downconverters that offer both green and red emissions to achieve a wide color gamut.
- Corentin Dabard
- , Victor Guilloux
- & Sandrine Ithurria
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| Open Access
Nanoscale 3D spatial addressing and valence control of quantum dots using wireframe DNA origami
Programming the 3D spatial organization of quantum dots requires precise control over their individual valence, but this is challenging due to the possible presence of multiple binding sites. Here, authors develop a general approach that uses highly programmable wireframe DNA origami structures to control the 3D spatial relationships between QDs and other non-nucleic-acid molecules.
- Chi Chen
- , Xingfei Wei
- & Mark Bathe
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| Open Access
Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit
It has been predicted that longitudinal coupling between a qubit and a superconducting resonator can mediate efficient interactions among distant qubits. Here the authors implement such a coupling between a singlet-triplet qubit in a semiconductor double quantum dot and a high-impedance superconducting resonator.
- C. G. L. Bøttcher
- , S. P. Harvey
- & A. Yacoby
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| Open Access
Photonic crystal enhanced fluorescence emission and blinking suppression for single quantum dot digital resolution biosensing
Nanoscale emitters are useful for measuring biomolecular interactions, but are limited by weak signals. Here, the authors use a photonic crystal surface for 3000-fold signal enhancement, achieving single emitter sensitivity with extended on-time, and demonstrate its application in miRNA biomarker sensing.
- Yanyu Xiong
- , Qinglan Huang
- & Brian T. Cunningham
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| Open Access
Optoelectronic system and device integration for quantum-dot light-emitting diode white lighting with computational design framework
Next generation smart lighting requires high colour rendering and wide colour controllability. Here, Jung et al. realise, via a systematic colour optimisation and a computational charge transport simulation, white quantum dot light-emitting diodes with high colour performance.
- Chatura Samarakoon
- , Hyung Woo Choi
- & Jong Min Kim
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| Open Access
Harnessing many-body spin environment for long coherence storage and high-fidelity single-shot qubit readout
Hybrid quantum devices based on coupled nuclear and electron spins offer promising applications, but require long nuclear spin coherence times. Here the authors demonstrate millisecond coherence times for a nuclear spin ensemble coupled to a single electron spin qubit in a semiconductor quantum dot.
- George Gillard
- , Edmund Clarke
- & Evgeny A. Chekhovich
High-throughput quantum photonic devices emitting indistinguishable photons in the telecom C-band