Article
Multidisciplinary Sciences
A. Gonzalez I., M. Pacheco, A. M. Calle, E. C. Siqueira, P. A. Orellana
Summary: This article studies the influence of quantum interference effects on electronic transport through a parallel triple quantum-dot system coupled to normal and superconducting leads in the linear response and non-equilibrium regime. Using a triple impurity Anderson Hamiltonian with Coulomb intra-dot correlations in all quantum dots, the Andreev conductance and transmittance are calculated within the superconductor gap. The results show Fano and Dicke-like resonances in the Andreev reflection spectra, with abrupt changes in charge due to the Dicke effect being one of the main findings.
SCIENTIFIC REPORTS
(2021)
Article
Quantum Science & Technology
Si-Si Gu, Bao-Chuan Wang, Ming-Bo Chen, Ting Lin, Yuan Kang, Hai-Ou Li, Gang Cao, Guo-Ping Guo
Summary: The integration of quantum dots with a microwave resonator in the hybrid circuit quantum electrodynamics architecture has created a controllable artificial system and enriched physics through electron-photon interaction. The study investigates a hybrid device where a triple quantum dot is dipole coupled with the electric field of a superconducting quantum interference device array resonator. The results suggest that the hybrid system has the potential to investigate exotic many-body effects and matter-light interaction, depending on the relationship between various Coulomb energy in the quantum dot and the cavity photon energy.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Dong-Yang Li, Jun-Hua Song, Zi-Yan Xu, Yu-Jia Gao, Xu Yin, Yu-Han Hou, Li -Juan Feng, Cheng-Yang Yue, Honghan Fei, Xiao-Wu Lei
Summary: In this study, a dynamic phonon-engineering strategy is used to achieve reversible photoluminescent switching among three 0D hybrid antimony halides. This research not only demonstrates the potential applications of hybrid metal halides, but also contributes to the protection of confidential information and anti-counterfeiting.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Heidi Potts, Markus Aspegren, Rousan Debbarma, Sebastian Lehmann, Claes Thelander
Summary: We investigate tunnel transport spectroscopy on a quantum dot molecule with a superconducting contact. The scattering between quantum dot spins and Bogoliubov quasiparticles leads to the formation of Yu-Shiba-Rusinov states within the superconducting gap. We find that the interaction between inter-dot spin-triplet state and the superconductor is stronger than the corresponding singlet, indicating stronger screening.
Article
Quantum Science & Technology
Weijie Li, Zhihai Liu, Jingwei Mu, Yi Luo, Dong Pan, Jianhua Zhao, H. Q. Xu
Summary: A serial triple quantum dot (TQD) integrated with a quantum dot (QD) charge sensor was successfully realized using a fine finger-gate technique applied to an InAs nanowire. The complex charge states and intriguing properties of the TQD were studied in the few-electron regime through direct transport measurements and charge-sensor detection measurements. The TQD's charge stability diagrams were measured by the charge sensor and were well reproduced by simultaneous direct transport measurements and simulations based on an effective capacitance network model. In addition, the TQD was demonstrated and discussed as a quantum cellular automaton.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
D. Krychowski, M. Antkiewicz, S. Lipinski
Summary: Strong electron correlations in three capacitively coupled quantum dots were discussed using the finite-U mean field slave boson approach. Depending on the interactions and occupation, charge ordered states or various spin, spin-charge, and charge Kondo resonances may arise.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wonjin Jang, Min-Kyun Cho, Hyeongyu Jang, Jehyun Kim, Jaemin Park, Gyeonghun Kim, Byoungwoo Kang, Hwanchul Jung, Vladimir Umansky, Dohun Kim
Summary: This study presents a high-fidelity readout method for a semiconductor hybrid qubit in GaAs double quantum dots, achieving quantum state mapping with voltage-controlled adiabatic transitions and energy-selective tunneling-based spin-to-charge conversion with a visibility of approximately 92.6%. The research also demonstrates coherent oscillations of a hybrid qubit in GaAs and explores the potential applications of this method in other materials.
Article
Multidisciplinary Sciences
L. A. Castro-Enriquez, A. Martin-Ruiz, Mauro Cambiaso
Summary: In this study, we investigate a hybrid plexciton system composed of a semiconductor quantum dot and a topological insulator nanoparticle. Under the influence of an external magnetic field, long-lived plasmonic surface modes are induced by the topological magnetoelectricity of the nanoparticle and coupled with the quantum dot through its polarization operator. We treat the hybrid system as an open quantum system, taking into account environmental effects with the master equation in the Born-Markov approximation. By applying Peres' positive partial transpose criterion, we quantify the entanglement of the hybrid system and demonstrate that it is a direct signature of the Z(2) invariant of topological insulators.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
L. Banszerus, S. Moeller, E. Icking, C. Steiner, D. Neumaier, M. Otto, K. Watanabe, T. Taniguchi, C. Volk, C. Stampfer
Summary: The research demonstrates dispersive readout of individual charge states in gate-defined few-electron quantum dots in bilayer graphene. By utilizing a radio frequency reflectometry circuit, changes in quantum capacitance can be detected over a wide gate-voltage range, allowing probing of excited states down to the single-electron regime without the need for additional quantum devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Kaixiang Chen, Chufan Zhang, Xiaoxian Zang, Fuyuan Ma, Yuanzhen Chen, Yaping Dan
Summary: Coating graphene with quantum dots enhances light absorption and leads to high photogain. Light illumination narrows down the surface depletion region, creating a photovoltage that gates the graphene, resulting in high photogain in graphene.
Article
Physics, Condensed Matter
Natalya A. Zimbovskaya
Summary: The present study focuses on the theoretical analysis of thermoelectric transport and heat transfer in a junction consisting of a T-shaped double quantum dot coupled to nonmagnetic electrodes and supplemented with a third dot in a parallel configuration. The results show that the combination of Coulomb interactions and quantum interference in the T-shaped portion of the system significantly affects both charge and heat transfer.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Yi-Ming Liu, Yuan-Dong Wang, Jian-Hua Wei
Summary: New characteristics of the Kondo effect, arising from spin chirality induced by the Berry phase in the equilibrium state, are investigated. The analysis is based on the hierarchical equations of motion (HEOM) approach in a triangular triple quantum-dot (TTQD) structure. The study finds that under the influence of a perpendicular magnetic field, the spin chirality leads to the splitting of the Kondo peak, indicating the important role of the phase factor in the Kondo effect. This work provides insight into the quantum transport of strongly correlated electronic systems.
Article
Nanoscience & Nanotechnology
Xin Zheng, Yangbin Zhu, Yang Liu, Linpeng Zhou, Zhongwei Xu, Chen Feng, Chunbo Zheng, Yueting Zheng, Jieyu Bai, Kaiyu Yang, Dongyan Zhu, Jianmin Yao, Hailong Hu, Yuanhui Zheng, Tailiang Guo, Fushan Li
Summary: The study presents a triple-level unclonable anti-counterfeiting system utilizing inkjet printing technique, glass microspheres, and quantum dots to create multiple layers of security features, which can resist forgery and be easily authenticated.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Heedae Kim, Jong Su Kim, Jin Dong Song
Summary: Micro-photoluminescence in a single GaAs quantum ring was observed, with a blue shift in the energy levels of the ground and excited state excitons as the excitation power increased. The excited state exciton exhibited strong polarization dependence due to an asymmetric localized state. Temperature-dependence measurements revealed a stronger exciton-phonon interaction in the excited state compared to the ground state, resulting from enhanced confinement. Additionally, confined electrons in the asymmetric ring structure of the single GaAs quantum ring exhibited a higher activation energy.
Article
Multidisciplinary Sciences
B. Jonas, D. Heinze, E. Schoell, P. Kallert, T. Langer, S. Krehs, A. Widhalm, K. D. Joens, D. Reuter, S. Schumacher, A. Zrenner
Summary: The authors introduce an all-optical nonlinear method to tailor and control the single photon emission. They demonstrate energy tuning and polarization control of the emitted photons through a laser-controlled down-conversion process.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Takuya Iwasaki, Taku Kato, Hirohito Ito, Kenji Watanabe, Takashi Taniguchi, Yutaka Wakayama, Tsuyoshi Hatano, Satoshi Moriyama
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Multidisciplinary
Takashi Nakajima, Akito Noiri, Kento Kawasaki, Jun Yoneda, Peter Stano, Shinichi Amaha, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, Seigo Tarucha
Article
Physics, Applied
G. Giavaras, Yasuhiro Tokura
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Tsuyoshi Hatano, Toshihiro Kubo, Shinichi Amaha, Yasuhiro Tokura, Seigo Tarucha
Summary: The study investigates the electron transport properties of parallel-coupled double quantum dot devices under magnetic fields, observing different behaviors such as electron tunneling at low magnetic fields and the coexistence of parallel- and series-coupled DQDs under high magnetic fields. The observations are attributed to changes in tunnel couplings induced by the magnetic fields.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Multidisciplinary
Shunsuke Kamimura, Hideaki Hakoshima, Yuichiro Matsuzaki, Kyo Yoshida, Yasuhiro Tokura
Summary: This study presents a quantum-enhanced heat engine with entanglement, utilizing superabsorption to enhance energy absorption by entangled qubits. Compared to conventional engines, this quantum heat engine provides power with a quantum scaling advantage of P = Theta(N-2), elucidating the quantum properties allowing for enhanced performance.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Hiroto Kasai, Yuki Takeuchi, Hideaki Hakoshima, Yuichiro Matsuzaki, Yasuhiro Tokura
Summary: This research introduces an anonymous quantum sensor that can hide the information of positions having non-zero magnetic fields after measurement, ensuring security and privacy. The effectiveness and feasibility of the quantum sensor are demonstrated by evaluating its sensitivity.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Kazuyuki Kuroyama, Sadashige Matsuo, Jo Muramoto, Shunsuke Yabunaka, Sascha R. Valentin, Arne Ludwig, Andreas D. Wieck, Yasuhiro Tokura, Seigo Tarucha
Summary: We report experimental observations of charge-spin cooperative dynamics of two-electron states in a GaAs double quantum dot located in a nonequilibrium phonon environment. The spin-flip rate of a single electron is significantly enhanced when the phonon energy exceeds the lowest excitation energy in the quantum dot. In addition, the spatial gradient of phonon density between the dots leads to a higher probability of parallel spin states than antiparallel ones.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Yudai Ueki, Shunsuke Kamimura, Yuichiro Matsuzaki, Kyo Yoshida, Yasuhiro Tokura
Summary: This article presents a quantum battery system that utilizes collective and entanglement effects to achieve ultra-fast charging.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Toshiaki Hayashi, Yasuhiro Tokura, Katsuhiko Nishiguchi
Summary: Variable-range hopping transport is studied from a new perspective, focusing on the statistical properties of voltage potential at different sites. By calculating the deviations in the voltage potentials using rate equations, it is found that there are two temperature regimes: nearest-neighbor hopping at high temperatures and variable-range hopping at low temperatures. The temperature dependence of the correlation length confirms the development of long-range order in the variable-range hopping regime.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Shunsuke Kamimura, Kyo Yoshida, Yasuhiro Tokura, Yuichiro Matsuzaki
Summary: In this study, new boundaries on the heat current in a quantum system coupled with an environment are derived and specific examples and restrictions are provided. These results are important for evaluating the performance of quantum-enhanced thermodynamic devices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Tsuyoshi Yamamoto, Yasuhiro Tokura, Takeo Kato
Summary: We study the backaction of quantum measurements on heat transport through a two-level system. The nonselective measurement leads to dephasing effect on the two-level system. We formulate the heat current under the selective measurement with a stochastic master equation and show that the cross-correlation between the measurement outcomes and the heat current contains information on the backaction. We expect that our findings can be verified using a platform of superconducting circuits.
Article
Materials Science, Multidisciplinary
M. Kondo, S. Miyota, W. Izumida, S. Amaha, T. Hatano
Summary: The study investigates the impact of thermal energy on the current flow and electron spin states in double quantum dots. At low temperatures, quadruplet Pauli spin blockade is affected by thermal energy, leading to the coexistence of Coulomb and Pauli spin blockades, while the standard triplet Pauli spin blockade leads to a monotonic smearing of current as temperature increases.
Article
Materials Science, Multidisciplinary
Yosuke Sato, Sadashige Matsuo, Chen-Hsuan Hsu, Peter Stano, Kento Ueda, Yuusuke Takeshige, Hiroshi Kamata, Joon Sue Lee, Borzoyeh Shojaei, Kaushini Wickramasinghe, Javad Shabani, Chris Palmstrom, Yasuhiro Tokura, Daniel Loss, Seigo Tarucha
Article
Materials Science, Multidisciplinary
G. Giavaras, Y. Tokura
