Article
Chemistry, Multidisciplinary
Erik Kirstein, Dmitri R. Yakovlev, Mikhail M. Glazov, Eiko Evers, Evgeny A. Zhukov, Vasilii V. Belykh, Nataliia E. Kopteva, Dennis Kudlacik, Olga Nazarenko, Dmitry N. Dirin, Maksym Kovalenko, Manfred Bayer
Summary: The excellent optical quality of lead halide perovskites has inspired research into their potential for optical control of carrier spins, with studies showing them as promising competitors for traditional semiconductors in spintronics. Through experimental and theoretical analysis, the coherent spin dynamics of electrons and holes in these materials have been explored, revealing their potential applications and characteristics.
ADVANCED MATERIALS
(2022)
Review
Quantum Science & Technology
Peihao Huang
Summary: This article discusses the progress on spin dephasing of two exchange-coupled spins in a double quantum dot, including schemes of two-qubit gates and qubit encodings, as well as methods of suppressing spin dephasing. Understanding spin dephasing may lead to high-fidelity quantum gates for spin-based quantum computing.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Xiaolei Chu, Alex Abelson, Caroline Qian, Oleg Igouchkine, Ethan Field, Kwan-Liu Ma, Matt Law, Adam J. J. Moule
Summary: Using scanning transmission electron microscopy (STEM) and full-tilt tomographic reconstruction, a single-crystalline region of a 3D epitaxially-fused PbSe quantum dot (QD) superlattice containing 633 QDs was imaged at a spatial resolution of 2.16 angstrom. The analysis revealed 3D mesoscale correlations of atomic lattice and superlattice order across hundreds of nanocrystals, and showed that the QD surface layers template the superlattice. The techniques presented in this study can be applied to a wide range of 3D nanostructured materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kevin D. Vallejo, Carlos I. Cabrera-Perdomo, Trent A. Garrett, Madison D. Drake, Baolai Liang, Kevin A. Grossklaus, Paul J. Simmonds
Summary: In this study, we showcase the tailored self-assembled growth of In0.5Ga0.5As quantum dots (QDs) on GaSb(111)A surfaces using molecular beam epitaxy. These QDs demonstrate excellent structural and optical quality through spontaneous Volmer-Weber growth. By utilizing tensile strain, we are able to reduce their band gap energy and achieve light emission in the midwave infrared wavelength range. Furthermore, we observe a blue-shift in emission wavelength with increasing QD size, which we attribute to the incorporation of Sb into the InGaAs QDs from the GaSb barriers. This research holds significant importance as it paves the way for the development of highly tunable mid-infrared light sources.
Article
Chemistry, Multidisciplinary
T. S. Shamirzaev, A. V. Shumilin, D. S. Smirnov, D. Kudlacik, S. V. Nekrasov, Yu G. Kusrayev, D. R. Yakovlev, M. Bayer
Summary: This study investigated exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots with indirect band gap and type-I band alignment. The anisotropic exchange interaction in these quantum dots was found to be negligible, enabling the formation of spin-polarized bright excitons under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons were controlled by the hyperfine interaction between the electron and nuclear spins. A kinetic model was developed to quantitatively describe the experimental data, taking into account the population dynamics of the bright and dark exciton states as well as the spin dynamics.
Article
Quantum Science & Technology
Qin Wan, Fei Zeng, Junwei Yu, Tongjin Chen, Ziao Lu, Feng Pan
Summary: Research and development of memristor-based neuromorphic networks has reached large-scale application stage, but a thorough understanding of the adopted memristors is still lacking. In this study, a method to manipulate the local activity of NbO quantum dot (QD) system by creating an electrode tip is proposed, enabling reversible nucleation behavior and periodic pulsing. These mechanisms contribute to the information-energy conversion in the QD system and provide a more precise and low energy-consumption approach for neuromorphic computing.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Mona Atabakhshi-Kashi, Monica Carril, Hossein Mahdavi, Wolfgang J. Parak, Carolina Carrillo-Carrion, Khosro Khajeh
Summary: The successful conjugation of antibodies onto a fluorescent NP assembly demonstrated that the NP assembly retained the targeting ability of the antibodies in cellular uptake, while also preserving its intrinsic properties such as fluorescence.
Article
Nanoscience & Nanotechnology
N. S. Maslova, P. I. Arseyev, I. M. Sokolov, V. N. Mantsevich
Summary: A protocol for entanglement formation between electronic spins in the system of interacting quantum dots and circular polarized cavity photons was proposed. The entangled states are formed due to the spin-orbit interaction in the system consisting of two different types of diamond-like spatially arranged quantum dots resonantly interacting with left and right circular polarized cavity fields. The time evolution of entanglement degree (concurrence) in the presence of interaction with fermionic reservoir and cavity leakage was obtained.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Quantum Science & Technology
Abhishek Kejriwal, Dasika Shishir, Sumiran Pujari, Kasturi Saha
Summary: Nitrogen-Vacancy (NV) centers in diamonds act as a room-temperature platform for various quantum technologies, and a freezing protocol has been demonstrated to isolate the intrinsic nuclear spin of an NV center from a noisy electromagnetic environment. Numerical simulations show that this protocol effectively shields the nuclear spin from strong drive or noise fields. The suppression of quantum correlations in the frozen nuclear spin regime, measured through the quantum discord of the electron-nuclear spin system, can be instrumental in extending the storage times of NV nuclear spin-based quantum memories in hybrid quantum systems.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Physics, Applied
Adrien Khalili, Claire Abadie, Tung Huu Dang, Audrey Chu, Eva Izquierdo, Corentin Dabard, Charlie Greboval, Mariarosa Cavallo, Huichen Zhang, Stefano Pierini, Yoann Prado, Xiang Zhen Xu, Sandrine Ithurria, Gregory Vincent, Christophe Coinon, Ludovic Desplanque, Emmanuel Lhuillier
Summary: This study proposes a method to broaden the spectral range of InGaAs by using HgTe nanocrystals and alleviating lattice matching constraints in short wave infrared sensing. A diode structure is designed, where a p-type HgTe NC array and n-type InGaAs wires are used to extract minority carriers. This work opens up new possibilities for infrared detection using epitaxially grown and colloidally grown semiconductors.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
M. Milivojevic
Summary: The study explores the possibility of determining the Rashba spin-orbit coupling strength in InSb nanowire quantum dots by measuring the magnetic susceptibility of the two-electron system in a double quantum dot. It is found that the magnetic susceptibility reaches a maximal value when the spin-orbit and magnetic field are parallel/antiparallel, which can be used to extract the value of the Rashba parameter.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Physical
Jingtao Liu, Hang Li, Xiaohui Liu, Ying Wang, Yingnan Guo, Shufang Wang, Guangsheng Fu, Yuriy I. Mazur, Morgan E. Ware, Gregory J. Salamo, Baolai Liang
Summary: This study investigates carrier injection hybrid structures, where carriers are injected from an adjacent quantum well into a layer of surface quantum dots. The hybrid structures show enhanced photoluminescence intensity compared to reference surface quantum dots. The best carrier injection efficiency is achieved with a 2.5 nm spacer, demonstrating strong coupling between the quantum well and the surface quantum dots. However, the carrier injection is less efficient than expected due to resonant carrier tunneling and significant carrier loss through nonradiative recombination.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zhijing Zhang, Sushant Ghimire, Takuya Okamoto, Bhagyashree Mahesha Sachith, Jeladhara Sobhanan, Challapalli Subrahmanyam, Vasudevanpillai Biju
Summary: This study reports the mechanically changing excitons and photoluminescence of self-assembled formamidinium lead bromide (FAPbBr(3)) quantum dots. The structure and excitonic properties of individual quantum dots are different from the self-assemblies. The mechanically changing emission color and lifetime of halide perovskite have potential applications in mechano-optical and optomechanical devices.
Article
Physics, Multidisciplinary
Yi-Qian Sun, T. J. Gao
Summary: This paper investigates the influence of electron interaction on the magnetic coupling between diluted magnetic semiconductor quantum dots embedded in semiconductors. The RKKY magnetic interaction between the local spins of two diluted magnetic semiconductor quantum dots in the semiconductor is calculated using the Keldysh Green's function method, considering the electronic interaction using a simple self-consistent mean-field approximation.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Heike Eisenlohr, Matthias Vojta
Summary: The phenomenology of quantum phase transitions deals with physics at low temperatures and energies, often reaching millikelvin temperatures in solid-state experiments. This study explores how continuous magnetic quantum phase transitions are influenced, modified, or destroyed by the coupling to nuclear spins. Results show the sensitivity of quantum critical systems to small perturbations, affecting the observability of purely electronic quantum criticality at low temperatures.
Article
Nanoscience & Nanotechnology
Ajit Srivastava, Meinrad Sidler, Adrien V. Allain, Dominik S. Lembke, Andras Kis, A. Imamoglu
NATURE NANOTECHNOLOGY
(2015)
Article
Physics, Multidisciplinary
Meinrad Sidler, Patrick Back, Ovidiu Cotlet, Ajit Srivastava, Thomas Fink, Martin Kroner, Eugene Demler, Atac Imamoglu
Article
Physics, Multidisciplinary
Andrei Zholud, Ryan Freeman, Rongxing Cao, Ajit Srivastava, Sergei Urazhdin
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
Patrick Back, Meinrad Sidler, Ovidiu Cotlet, Ajit Srivastava, Naotomo Takemura, Martin Kroner, Atac Imamoglu
PHYSICAL REVIEW LETTERS
(2017)
Article
Multidisciplinary Sciences
Chongyun Jiang, Fucai Liu, Jorge Cuadra, Zumeng Huang, Ke Li, Abdullah Rasmita, Ajit Srivastava, Zheng Liu, Wei-Bo Gao
NATURE COMMUNICATIONS
(2017)
News Item
Chemistry, Physical
Ajit Srivastava
Article
Physics, Multidisciplinary
Xiaotong Chen, Xin Lu, Sudipta Dubey, Qiang Yao, Sheng Liu, Xingzhi Wang, Qihua Xiong, Lifa Zhang, Ajit Srivastava
Editorial Material
Multidisciplinary Sciences
Bernhard Urbaszek, Ajit Srivastava
Article
Nanoscience & Nanotechnology
Xin Lu, Xiaotong Chen, Sudipta Dubey, Qiang Yao, Weijie Li, Xingzhi Wang, Qihua Xiong, Ajit Srivastava
NATURE NANOTECHNOLOGY
(2019)
Article
Chemistry, Physical
Li Weijie, Lu Xin, Sudipta Dubey, Luka Devenica, Ajit Srivastava
Article
Chemistry, Multidisciplinary
Chentao Li, Xin Lu, Ajit Srivastava, S. David Storm, Rachel Gelfand, Matthew Pelton, Maxim Sukharev, Hayk Harutyunyan
Summary: This study presents the first experimental investigation of the nonlinear properties of monolayer transition metal dichalcogenides coupled to metal plasmonic nanocavities, showing a pronounced splitting in the pump-frequency dependence of the second-harmonic signal. Numerical simulations utilizing a nonperturbative nonlinear hydrodynamic model of conduction electrons support this interpretation and reproduce experimental results.
Article
Nanoscience & Nanotechnology
Weijie Li, Xin Lu, Jiatian Wu, Ajit Srivastava
Summary: Research has shown that many-body interactions among interlayer excitons in a WSe2/MoSe2 heterobilayer can induce a valley Zeeman splitting that is comparable in strength to a magnetic field of approximately 6 T, and the g-factor of the valley Zeeman splitting can be tuned by incident power, providing an effective way to control the valley pseudospin.
NATURE NANOTECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Tyler B. Smith, Lakshmi Pullasseri, Ajit Srivastava
Summary: This study demonstrates that the quantum metric of Bloch electrons leads to momentum-space gravity, highlighting connections between quantum geometry, momentum-space gravity, and quantum information.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Wei Zhang, Ajit Srivastava, Xiao Li, Lifa Zhang
Proceedings Paper
Engineering, Electrical & Electronic
Ajit Srivastava, Atac Imamoglu
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2016)