Article
Materials Science, Multidisciplinary
Amin Hosseinkhani, Guido Burkard
Summary: In this study, we developed a theory for the relaxation of single-electron silicon spin qubits in the presence of a magnetic field gradient. We successfully reproduced experimental measurements using our theoretical modeling, showing that the presence of a gradient field can modify the spin-mixing mechanisms and the EDSR Rabi frequency of a silicon spin qubit. The effect strongly depends on the details of the interface roughness.
Article
Physics, Multidisciplinary
Peihao Huang, Xuedong Hu
Summary: The study of synthetic spin-orbit coupling (SOC) in a quantum dot reveals significant differences in the spin dynamics compared to intrinsic SOC, with synthetic SOC inducing distinct spin relaxation, spin dephasing, and spin manipulation behaviors attributed to the broken time-reversal symmetry. These results highlight the important impact of synthetic SOC on spin dynamics in quantum dots, providing insights into potential applications in spin-based quantum computing.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
He Liu, Ting Zhang, Ke Wang, Fei Gao, Gang Xu, Xin Zhang, Shu-Xiao Li, Gang Cao, Ting Wang, Jianjun Zhang, Xuedong Hu, Hai-Ou Li, Guo-Ping Guo
Summary: Researchers have demonstrated a tunable spin-orbit interaction in a double quantum dot system in a germanium hut wire. This finding could enable fast spin manipulation and reduce decoherence, potentially leading to high-fidelity qubits in germanium hut wire systems.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Jinwu Wei, Xiao Wang, Baoshan Cui, Chenyang Guo, Hongjun Xu, Yao Guang, Yuqiang Wang, Xuming Luo, Caihua Wan, Jiafeng Feng, Hongxiang Wei, Gen Yin, Xiufeng Han, Guoqiang Yu
Summary: Synthetic antiferromagnets (SAFs) show potential in next-generation spintronic devices due to zero net magnetization and high thermal stability, despite typically requiring an in-plane effective magnetic field. A new study demonstrates field-free switching in an all-SAF system with significantly reduced net magnetization, showing robustness up to approximately 460 K.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Pawel Wojcik, Andrea Bertoni, Guido Goldoni
Summary: In this study, we used the k . p theory and envelope function approach to evaluate the Rashba spin-orbit coupling induced by a magnetic field in different orientations in a semiconductor nanowire, taking into account the prismatic symmetry of typical nanocrystals. Our results demonstrate the anisotropy of spin-orbit coupling at high magnetic fields, as well as the twofold anisotropy induced by a backgate potential breaking the native symmetry of the nanocrystal. Overall, our calculations are in agreement with recent experimental analysis, providing a microscopic interpretation of the vectorial character of the spin-orbit coupling in the same nanomaterial.
Article
Multidisciplinary Sciences
Michal Pudlak, R. Nazmitdinov
Summary: This paper investigates electron transport through a one-dimensional quantum ring in the presence of external fields. The effects of optical radiation produced by a high-frequency electric field and a perpendicular magnetic field are described using the Floquet theory. The specific conditions for achieving the spin-filtering effect caused by the interplay of the external fields and Rashba spin-orbit interaction are found analytically.
Article
Chemistry, Multidisciplinary
Kok Wai Chan, Harshad Sahasrabudhe, Wister Huang, Yu Wang, Henry C. Yang, Menno Veldhorst, Jason C. C. Hwang, Fahd A. Mohiyaddin, Fay E. Hudson, Kohei M. Itoh, Andre Saraiva, Andrea Morello, Arne Laucht, Rajib Rahman, Andrew S. Dzurak
Summary: Quantum gates between spin qubits can be implemented through controlled Heisenberg exchange interaction by adjusting the overlap between electronic wave functions. Another approach is to establish coupling between distant spins through mediated superexchange. Experimental evidence in a linear array of three single-electron spin qubits in silicon confirms direct exchange coupling and second neighbor mediated superexchange.
Article
Chemistry, Multidisciplinary
Nguyen Huu Lam, Phuong Lien Nguyen, Byoung Ki Choi, Trinh Thi Ly, Ganbat Duvjir, Tae Gyu Rhee, Yong Jin Jo, Tae Heon Kim, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Younghun Hwang, Young Jun Chang, Jaekwang Lee, Jungdae Kim
Summary: In this study, the strength of spin-orbit coupling in NiTe2 is shown to be tunable through Se substitution, resulting in shifts of the bulk Dirac point while maintaining the type-II Dirac band. This approach provides an effective means of controlling the type-II Dirac band in NiTe2 and can be applicable to other topological materials.
Article
Optics
Lifu Zhang, Jie Jiang, Christian Multunas, Chen Ming, Zhizhong Chen, Yang Hu, Zonghuan Lu, Saloni Pendse, Ru Jia, Mani Chandra, Yi-Yang Sun, Toh-Ming Lu, Yuan Ping, Ravishankar Sundararaman, Jian Shi
Summary: Researchers demonstrate a persistent spin helix in an organic-inorganic hybrid ferroelectric halide perovskite. They show that the spin-polarized band structure can be switched via an intrinsic ferroelectric field. This discovery has the potential to resolve the control-relaxation dilemma in spintronic devices.
Article
Physics, Condensed Matter
Pooja Saini, Soma Mukhopadhyay, Ashok Chatterjee
Summary: The study focuses on an off-centre hydrogenic D0 centre in a 2D Gaussian quantum dot, considering the effects of Rashba Dresselhaus spin-orbit interactions and an external magnetic field. The ground state binding energy of the D0 complex is calculated using an improved variational method, along with the calculation of magnetic susceptibility of the system. Results reveal interesting behavior with respect to different quantum dot parameters and spin-orbit couplings.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Physics, Condensed Matter
Pooja Saini, Soma Mukhopadhyay, Ashok Chatterjee
Summary: The binding energy of a hydrogenic neutral D0 complex in a three-dimensional asymmetric Gaussian GaAs quantum dot is analyzed considering the Rashba and Dresselhaus spin-orbit interactions and the influence of an external magnetic field. The variations in binding energy with respect to quantum dot size, magnetic field strength, donor position, and spin-orbit coupling strengths are calculated. Additionally, the magnetic susceptibility of the system is investigated for different values of the quantum dot parameters.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Quantum Science & Technology
Junxu Li, Manas Sajjan, Sumit Suresh Kale, Sabre Kais
Summary: This report proposes an experimental scheme to study the possible influence of quantum entanglement on the angular features of product distribution in a chemical reaction. The study aims to examine the relationship between quantum entanglement and spin-orbit interaction. The attainable results will be numerically simulated to highlight specific patterns corresponding to various possibilities, potentially providing unforeseen mechanistic insight into analogous reactions.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Nanoscience & Nanotechnology
Suman Dahiya, Siddhartha Lahon, Rinku Sharma
Summary: In this study, the effect of magnetic field, hydrostatic pressure, confining potential, and temperature on the third-harmonic generation (THG) in InxGa1-xAs 2D semi-parabolic quantum dots with Rashba spin-orbit interaction (SOI) is investigated. The main expression of THG is obtained using a formalism of compact density matrix. The results show that the Rashba SOI coefficient strongly affects the THG peaks, and external factors such as hydrostatic pressure, magnetic field, temperature, confining potential, and Rashba SOI induce a blue/redshift and corresponding increase/decrease in peak height. The conclusions suggest that for the engineering of optical devices based on quantum dots, the influence of SOI should be taken into consideration, and the optical properties of optoelectronic devices can be controlled by tuning the strength parameter.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Xuejie Xie, Xiujuan Wang, Wei Wang, Xiaonan Zhao, Lihui Bai, Yanxue Chen, Yufeng Tian, Shishen Yan
Summary: In this study, the controllable manipulation of multiple spin configurations is achieved by controlling long-range oscillatory interlayer coupling and neighboring ferrimagnetic coupling. This is done by integrating the advantages of ferromagnetic, ferrimagnetic, and antiferromagnetic spin configurations into a synthetic antiferromagnetic (SAF) heterostructure.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Haodong Fan, Menghao Jin, Yongming Luo, Hongxin Yang, Birui Wu, Zhongshu Feng, Yanshan Zhuang, Ziji Shao, Changqiu Yu, Hai Li, Jiahong Wen, Ningning Wang, Bo Liu, Wenjun Li, Tiejun Zhou
Summary: An exchange field gradient is introduced into perpendicularly magnetized synthetic ferro- and antiferromagnets (SFs and SAFs) through the insertion of a slightly wedged Ru between the two layers, enabling field-free switching of perpendicular SFs and SAFs with a high switching ratio. The field-free switching and effective spin-orbit torque (SOT) field are found to depend on the exchange field gradient. The results provide a new approach for achieving field-free switching and high SOT efficiency in perpendicularly magnetized SAFs for advanced magnetic memory devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ting Zhang, He Liu, Fei Gao, Gang Xu, Ke Wang, Xin Zhang, Gang Cao, Ting Wang, Jianjun Zhang, Xuedong Hu, Hai-Ou Li, Guo-Ping Guo
Summary: The study extracts the full g-tensor from strongly anisotropic leakage current in a double dot, revealing that the spin-orbit field is in-plane at an azimuthal angle of 59 degrees to the nanowire axis, indicating a strong spin-orbit interaction. The research demonstrates two different spin relaxation mechanisms for holes in Ge hut wire double dots, contributing to the feasibility of a Ge-based quantum processor.
Article
Physics, Applied
Ting Zhang, Ke Wang, Fei Gao, He Liu, Xin Zhang, Gang Cao, Ting Wang, Jianjun Zhang, Hai-Ou Li, Guo-Ping Guo
Summary: The research investigates the impact of strong spin-orbit interaction and weak hyperfine interaction on double quantum dots by applying an external magnetic field to Ge quantum dots. Under high magnetic field, spin-flip tunneling induced by SOI eliminates the Pauli spin blockade, revealing the energy spectrum of the DQD; while under low magnetic field, HFI mixes different states and leads to an increased leakage current.
APPLIED PHYSICS EXPRESS
(2021)
Article
Multidisciplinary Sciences
Ke Wang, Gang Xu, Fei Gao, He Liu, Rong-Long Ma, Xin Zhang, Zhanning Wang, Gang Cao, Ting Wang, Jian-Jun Zhang, Dimitrie Culcer, Xuedong Hu, Hong-Wen Jiang, Hai-Ou Li, Guang-Can Guo, Guo-Ping Guo
Summary: Hole-spin qubits in germanium show promise for rapid, all-electrical qubit control. The authors demonstrate ultrafast single-spin manipulation in a hole-based double quantum dot in a germanium hut wire, with a record Rabi frequency exceeding 540 MHz. These results suggest the potential for ultrafast coherent control of hole spin qubits to meet the requirements for scalable quantum information processing.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Rui-Zi Hu, Rong-Long Ma, Ming Ni, Xin Zhang, Yuan Zhou, Ke Wang, Gang Luo, Gang Cao, Zhen-Zhen Kong, Gui-Lei Wang, Hai-Ou Li, Guo-Ping Guo
Summary: This paper introduces how to realize a single spin qubit from Si-MOS quantum dots, including the structure and basic properties of the quantum dots, as well as methods for spin-to-charge conversion and coherent manipulation of spin qubits.
Article
Physics, Applied
He Liu, Ting Zhang, Ke Wang, Fei Gao, Gang Xu, Xin Zhang, Shu-Xiao Li, Gang Cao, Ting Wang, Jianjun Zhang, Xuedong Hu, Hai-Ou Li, Guo-Ping Guo
Summary: Researchers have demonstrated a tunable spin-orbit interaction in a double quantum dot system in a germanium hut wire. This finding could enable fast spin manipulation and reduce decoherence, potentially leading to high-fidelity qubits in germanium hut wire systems.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
He Liu, Ke Wang, Fei Gao, Jin Leng, Yang Liu, Yu-Chen Zhou, Gang Cao, Ting Wang, Jianjun Zhang, Peihao Huang, Hai-Ou Li, Guo-Ping Guo
Summary: Hole spin qubits based on germanium have strong tunable spin-orbit interaction and ultrafast qubit operation speed. We demonstrate that the Rabi frequency of a hole spin qubit in a Ge hut wire double quantum dot can be electrically tuned through the detuning energy and middle gate voltage. The discovery of an ultrafast and electrically tunable Rabi frequency in a hole spin qubit has potential applications in semiconductor quantum computing.
Article
Physics, Applied
Yuan Zhou, Sisi Gu, Ke Wang, Gang Cao, Xuedong Hu, Ming Gong, Hai-Ou Li, Guo-Ping Guo
Summary: In this work, we demonstrate a new approach to enhance the tunability of a quantum system through Floquet engineering based on longitudinal driving. By studying a multilevel model of gate-defined double quantum dots, we observe coherent interference and significantly enhanced tunability under longitudinal driving. This research is of great importance for quantum information processing.
PHYSICAL REVIEW APPLIED
(2023)