Zhi Wang

Chinese Academy of Sciences

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Alex Zunger

University of Colorado Boulder

Jun‐Wei Luo

Institute of Semiconductors

Lin‐Wang Wang

Institute of Semiconductors

Qifeng Liang

Shaoxing University

Keiji Morokuma

Kyoto University

Xingang Zhao

University of Tennessee at Knoxville

Dao‐Xin Yao

Sun Yat-sen University

Shu‐Shen Li

Institute of Semiconductors

Stephan Irle

Oak Ridge National Laboratory

Jia-Jin Feng

Peking University

Cooperative Institutions

Chinese Academy of Sciences

161

University of Chinese Academy of Sciences

Peking University

University of Science and Technology of China

Huazhong University of Science and Technology

Shandong University

Zhejiang University

Sun Yat-sen University

Institute of Semiconductors

University of Electronic Science and Technology of China

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Realization Method of Stable Continuous Steering Jumping for a Bioinspired Jerboa Robot

Advanced Theory and Simulations (2023)

Ziqiang Zhang Zhi Wang Jun Li Menɡ Ninɡ Jun Yang

Abstract The continuous jumping of bioinspired robots in 3D spaces can greatly improve its motion flexibility, which is one of the highlights of research on jumping robots. However, most existing jumping robots can only move in a plane, and achieving stable continuous steering jumping is difficult. In this study, a realization method of stable continuous steering jumping for a bioinspired jerboa robot is proposed. On the basis of the jumping mechanism of the jerboa, the robot mechanism model is established, and the factors affecting motion feasibility and performance are analyzed in detail. Then, mathematical models of the stability indices of the robot jumping on uneven ground with redundant driving are established. Based on the proposed improved bee colony algorithm, the motion parameters and driving parameters can be determined. Simulation results show that the robot can realize stable continuous steering jumping in different terrains along the expected trajectory, thus proving the feasibility of the method proposed in this study. This study provides a theoretical reference for the high‐speed flexible motion of legged robots in 3D spaces.

Realization (probability)

10.1002/adts.202300393

Cite

Citations (0)

Metal oxide alternatives for efficient electron transport in perovskite solar cells: beyond TiO₂ and SnO₂

Journal of Materials Chemistry A (2020)

Zhiyuan Cao Chengbo Li Xiaoyu Deng Shurong Wang Yuan Yuan

Recent advances of metal oxides beyond TiO₂ and SnO₂ for electron transport in perovskite solar cells are reviewed from the aspects of nanostructuring, element doping, surface modification, multi-layer design and large-scale fabrication.

10.1039/d0ta07282f

Cite

Citations (84)

Proposal for a flux qubit in a dc SQUID with the $4\pi$ period Josephson effect

arXiv (Cornell University) (2015)

Wenchao Huang Qifeng Liang Dao‐Xin Yao Zhi Wang

Constructing qubits which are suitable for quantum computation remains a notable challenge. Here, we propose a superconducting flux qubit in a dc SQUID structure, formed by a conventional insulator Josephson junction and a topological nanowire Josephson junction with Majorana bound states. The zero energy Majorana bound states transport $4\pi$ period Josephson currents in the nanowire junction. The interplay between this $4\pi$ period Josephson effect and the convectional $2\pi$ period Josephson effect in the insulator junction induces a double-well potential energy landscape in the SQUID. As a result, the two lowest energy levels of the SQUID are isolated from other levels. These two levels show contradicting circulating supercurrents, thus can be used as a flux qubit. We reveal that this flux qubit has the merits of stability to external noises, tolerance to the deviation of system parameters, and scalability to large numbers. Furthermore, we demonstrate how to couple this flux qubit with the Majorana qubit by tuning the junction parameters, and how to use this coupling to manipulate the Majorana qubit.

Flux qubit

Charge qubit

Magnetic flux quantum

Superconducting tunnel junction

Source

Cite

Citations (0)

Dynamical evolution of CO2 and H2O on garnet electrolyte elucidated by ambient pressure X-ray spectroscopies

Nature Communications (2024)

Nian Zhang Guoxi Ren Lili Li Zhi Wang Pengfei Yu

Abstract Garnet-type Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (LLZO) is considered a promising solid electrolyte, but the surface degradation in air hinders its application for all-solid-state battery. Recent studies have mainly focused on the final products of the LLZO surface reactions due to lacking of powerful in situ characterization methods. Here, we use ambient pressure X-ray spectroscopies to in situ investigate the dynamical evolution of LLZO surface in different gas environments. The newly developed ambient pressure mapping of resonant Auger spectroscopy clearly distinguishes the lithium containing species, including LiOH, Li 2 O, Li 2 CO 3 and lattice oxygen. The reaction of CO 2 with LLZO to form Li 2 CO 3 is found to be a thermodynamically favored self-limiting reaction. On the contrary, the reaction of H 2 O with LLZO lags behind that of CO 2 , but intensifies at high pressure. More interestingly, the results provide direct spectroscopic evidence for the existence of Li + /H + exchange and reveal the importance of the initial layer formed on clean electrolyte surface in determining their air stability. This work demonstrates that the newly developed in situ technologies pave a new way to investigate the oxygen evolution and surface degradation mechanism in energy materials.

Ambient pressure

Oxygen evolution

10.1038/s41467-024-47071-4

Cite

Citations (11)

Theoretical study on behaviors for Is~23s ?s~2np transition of Ni~(25+)ion in whole energy region

Journal of Atomic and Molecular Physics (2009)

Zhi Wang

The energies of 1s~23s and 1s~2np (n≤9) states for Ni~(25+) ion are calculated by using the full-core plus correlation method. The higher-order relativistic contribution and QED correction to the energy is estimated under a hydrogenic approximation. The transition energies, wavelengths and oscillator strengths for the 1s~23s 1s~2np transitions of this ion are calculated. The quantum defect of Rydberg series 1s~2np is determined according to the quantum defect theory. The energies of any highly excited states with n≥10 for this series can be reliably predicted. The discrete oscillator strengths for the transitions from 1s~23s state to highly excited states (n ≥10) and the oscillator strengths density corresponding to the bound-free transitions are obtained.

Quantum defect

Oscillator strength

Source

Cite

Citations (0)

Parity flipping mediated by a quantum dot in Majorana Josephson junctions

Physics Letters A (2023)

Shanbo Chow Zhi Wang Dao‐Xin Yao

Parity (physics)

10.1016/j.physleta.2023.128814

Cite

Citations (0)

Tetrazole modulated perovskite films for efficient solar cells with improved moisture stability

Chemical Engineering Journal (2020)

Lisha Xie Xiaoyu Deng Chengbo Li Yuying Cui Zhiyuan Cao

Passivation

Tetrazole

10.1016/j.cej.2020.127579

Cite

Citations (16)

Improving Broadband White‐Light Emission Performances of 2D Perovskites by Subtly Regulating Organic Cations

Chemistry - A European Journal (2020)

Chang‐Qing Jing Juan Wang Huifang Zhao Wen‐Xin Chu Yun Yuan

Recently, 2D organic-inorganic hybrid lead halide perovskites have attracted intensive attention in solid-state luminescence fields such as single-component white-light emitters, and rational optimization of the photoluminescence (PL) performance through accurate structural-design strategies is still significant. Herein, by carefully choosing homologous aliphatic amines as templates, isotypical perovskites [DMEDA]PbCl4 (1, DMEDA=N,N-dimethylethylenediamine) and [DMPDA]PbCl4 (2, DMPDA=N,N-dimethyl-1,3-diaminopropane) having tunable and stable broadband bluish white emission properties were rationally designed. The subtle regulation of organic cations leads to a higher degree of distortion of the 2D [PbCl4 ]2- layers and enhanced photoluminescence quantum efficiencies (<1 % for 1 and 4.9 % for 2). The broadband light emissions could be ascribed to self-trapped excitons on the basis of structural characterization, time-resolved PL, temperature-dependent PL emission, and theoretical calculations. This work gives a new guidance to rationally optimize the PL properties of low-dimensional halide perovskites and affords a platform to probe the structure-property relationship.

Rational design

10.1002/chem.202001178

Cite

Citations (25)

An efficient atomistic quantum mechanical simulation on InAs band-to-band tunneling field-effect transistors

Applied Physics Letters (2014)

Zhi Wang Xiangwei Jiang Shu‐Shen Li Lin‐Wang Wang

We have presented a fully atomistic quantum mechanical simulation method on band-to-band tunneling (BTBT) field-effect transistors (FETs). Our simulation approach is based on the linear combination of bulk band method with empirical pseudopotentials, which is an atomist method beyond the effective-mass approximation or k.p perturbation method, and can be used to simulate real-size devices (∼105 atoms) efficiently (∼5 h on a few computational cores). Using this approach, we studied the InAs dual-gate BTBT FETs. The I-V characteristics from our approach agree very well with the tight-binding non-equilibrium Green's function results, yet our method costs much less computationally. In addition, we have studied ways to increase the tunneling current and analyzed the effects of different mechanisms for that purpose.

Tight binding

10.1063/1.4869461

Cite

Citations (7)

UWBLoc: NLoS Mitigation for Practical UWB Localization

Chang Su Fusang Zhang Beihong Jin Junqi Ma Jiazhi Ni

Ultra-WideBand (UWB) technology has been employed for high-precision localization of targets due to its high resolution, low power consumption, and strong anti-interference capability. Though promising, the None-Line-of-Sight (NLoS) issue caused by walls and human occlusions in real-world scenarios significantly degrades ranging accuracy and localization performance. Existing methods have been developed to tackle this issue, however, they typically incur a high computational cost and are not easily adaptive to different environments. In this paper, we propose UWBLoc, a UWB-based localization system that achieves accurate localization under NLoS scenarios. Our insight is that Channel Impulse Response (CIR) from UWB device exhibits significant differences in Line-of-Sight (LoS) and NLoS environments, which can be utilized for link status identification. Meanwhile, we dynamically update the ranging weights of multiple anchors based on the link status identification and ranging residuals to characterize the influence of the environment on ranging. Then, we propose a hybrid distance and angle measurements algorithm based on the Taylor Series-based Least-Square (TS-LS) method, which effectively mitigates the impact of NLoS links on practical localization. We implement UWBLoc on commodity UWB devices and evaluate it in real office scenarios with obstructions such as walls and pillars. The evaluation results demonstrate that UWBLoc can achieve an average localization accuracy of 25.4 cm for single-point localization and 27.5 cm for real-time trajectory tracking.

Non-line-of-sight propagation

10.1109/swc57546.2023.10449041

Cite

Citations (0)