Chinese Physics Letters最新文献_第2页

Balancing the quantum speed limit and instantaneous energy cost in adiabatic quantum evolution 平衡绝热量子演化中的量子速度极限和瞬时能量成本

Chinese Physics Letters Pub Date : 2024-03-26 DOI: 10.1088/0256-307x/41/4/040202

Jianwen Xu, Yujia Zhang, Wen Zheng, Haoyang Cai, Haoyu Zhou, Xianke Li, Xudong Liao, Yu Zhang, Shaoxiong Li, Dong Lan, Xinsheng Tan, Yang Yu

{"title":"Balancing the quantum speed limit and instantaneous energy cost in adiabatic quantum evolution","authors":"Jianwen Xu, Yujia Zhang, Wen Zheng, Haoyang Cai, Haoyu Zhou, Xianke Li, Xudong Liao, Yu Zhang, Shaoxiong Li, Dong Lan, Xinsheng Tan, Yang Yu","doi":"10.1088/0256-307x/41/4/040202","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/040202","url":null,"abstract":"\u0000 Adiabatic time-optimal quantum controls are extensively used in quantum technologies to break the constraints imposed by short coherence times. However, in practical, it is crucial to consider the trade-off between the quantum evolution speed and instantaneous energy cost of process because of the constraints in the available control Hamiltonian. Here, we experimentally show using a transmon qubit that, even in the presence of vanishing energy gaps, it is possible to reach a highly time-optimal adiabatic quantum driving at low energy cost in the whole evolution process. This validates the recently derived general solution of the quantum Zermelo navigation problem, paving the way for energy-efficient quantum control which is usually overlooked in conventional speed-up schemes, including the well-known counter-diabatic driving. By designing the control Hamiltonian based on the quantum speed limit bound quantified by the changing rate of phase in the interaction picture, we reveal the relationship between the quantum speed limit and instantaneous energy cost. Consequently, we demonstrate fast and high-fidelity quantum adiabatic processes by employing energy-efficient driving strengths, indicating a promising strategy for expanding the applications of time-optimal quantum controls in superconducting quantum circuits.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"107 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140380583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic switching dynamics and tunnel magnetoresistance effect based on spin-splitting noncollinear antiferromagnet Mn3Pt 基于自旋分裂非共轭反铁磁体 Mn3Pt 的磁开关动力学和隧道磁阻效应

Chinese Physics Letters Pub Date : 2024-03-25 DOI: 10.1088/0256-307x/41/4/047502

Meng Zhu, J. Dong, Xinlu Li, Fanxing Zheng, Ye Zhou, Kun Wu, Jia Zhang

{"title":"Magnetic switching dynamics and tunnel magnetoresistance effect based on spin-splitting noncollinear antiferromagnet Mn3Pt","authors":"Meng Zhu, J. Dong, Xinlu Li, Fanxing Zheng, Ye Zhou, Kun Wu, Jia Zhang","doi":"10.1088/0256-307x/41/4/047502","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/047502","url":null,"abstract":"\u0000 In comparison to ferromagnets, antiferromagnets are believed to have superior advantages for applications in next-generation magnetic storage devices, including fast spin dynamics, vanishing stray fields and robust against external magnetic field, etc. However, unlike ferromagnetic orders, which could be detected through tunneling magnetoresistance effect in magnetic tunnel junctions, the antiferromagnetic order (i.e., Néel vector) cannot be effectively detected by the similar mechanism due to the spin degeneracy of conventional antiferromagnets. Recently discovered spin-splitting noncollinear antiferromagnets such as Mn3Pt with momentum-dependent spin polarization due to their special magnetic space group, make them possible to achieve remarkable tunneling magnetoresistance effects in noncollinear antiferromagnetic tunnel junctions. Through first-principles calculations, we demonstrate that the tunneling magnetoresistance ratio can reach more than 800% in Mn3Pt/perovskite oxides/Mn3Pt antiferromagnetic tunnel junctions. We also reveal the switching dynamics of Mn3Pt thin film under magnetic fields using atomistic spin dynamic simulation. Our study provides a reliable method for detecting Néel vector of noncollinear antiferromagnets through the tunnel magnetoresistance effect and may pave its way for potential applications in antiferromagnetic memory devices.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 772","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140382862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Dark localized waves in shallow waters: An analysis within an extended Boussinesq system 浅水中的局部暗波：扩展的布森斯克系统内的分析

Chinese Physics Letters Pub Date : 2024-02-29 DOI: 10.1088/0256-307x/41/4/044201

Zhengping Yang, W. Zhong, Milivoj R. Belić

引用次数: 0

Experimental investigation on the anisotropic thermal conductivity of C/SiC composite thin slab 关于 C/SiC 复合薄板各向异性导热性的实验研究

Chinese Physics Letters Pub Date : 2024-02-28 DOI: 10.1088/0256-307x/41/3/034401

Ke-Fan Wu, Hu Zhang, Gui-Hua Tang

{"title":"Experimental investigation on the anisotropic thermal conductivity of C/SiC composite thin slab","authors":"Ke-Fan Wu, Hu Zhang, Gui-Hua Tang","doi":"10.1088/0256-307x/41/3/034401","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/034401","url":null,"abstract":"\u0000 Due to the anisotropic fibers and structure distribution, fiber-reinforced composites possess anisotropic mechanical and heat transfer properties. For C/SiC composites, the out-of-plane thermal conductivity was mainly studied whereas the in-plane thermal conductivity received less attentions due to its limited thickness. In this study, the slab module of transient plane source method is adopted to measure the in-plane thermal conductivity of 2D plain woven C/SiC composite slab and the test uncertainty is analyzed numerically for the first time. The numerical investigation proves that the slab module is reliable for measuring the isotropic and anisotropic slabs with in-plane thermal conductivity greater than 10 W·m-1·K-1. The anisotropic thermal conductivity of 2D plain woven C/SiC composite slab is obtained within the temperature range of 20℃-900℃ by combining with the laser flash analysis method to measure the out-of-plane thermal conductivity. The results demonstrate that the out-of-plane thermal conductivity of C/SiC composite decreases with temperature while its in-plane thermal conductivity increases with temperature first and then decreases, and the ratio of in-plane thermal conductivity to out-of-plane thermal conductivity is within 2.2-3.1.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"10 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140423095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MWCNT Doped Reverse-Mode Polymer Network Liquid Crystals with Frequency Response Property 具有频率响应特性的掺杂 MWCNT 反向模式聚合物网络液晶

Chinese Physics Letters Pub Date : 2024-02-26 DOI: 10.1088/0256-307x/41/3/038501

Jiajun Li, Dongchao Ji, Zhibo Zhang, Yanan Yang, Ruicong Zhang, Tianyu Wang, Yumin Zhang, Wenxin Cao, Jiaqi Zhu

{"title":"MWCNT Doped Reverse-Mode Polymer Network Liquid Crystals with Frequency Response Property","authors":"Jiajun Li, Dongchao Ji, Zhibo Zhang, Yanan Yang, Ruicong Zhang, Tianyu Wang, Yumin Zhang, Wenxin Cao, Jiaqi Zhu","doi":"10.1088/0256-307x/41/3/038501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/038501","url":null,"abstract":"\u0000 Polymer-liquid crystals (PLC) is a common material for smart windows. However, PLC smart windows usually require high driving voltage to maintain transparency. In this work, we synthesized a novel PLC smart film by doping multi-wall carbon nanotubes (MWCNT) into a reverse-mode polymer network liquid crystal (R-PNLC). It was found that doping MWCNT could effectively reduce the threshold voltage (V\u0000 th) of R-PNLC from 19.0V to 8.4V. Due to co-orientation between MWCNT and LC molecules, the doped R-PNLC was able to maintain a high transmittance of visible light (~80%) without an applied electric field. We found that doping MWCNT could change the frequency modulation property of R-PNLC. The doped R-PNLC exhibits a wider frequency modulation range up to 40,000Hz, while the frequency modulation of the undoped R-PNLC reached to a saturation at 23,000 Hz. We also tested the electromagnetic interference (EMI) shielding efficiency of R-PNLC and found that the EMI shielding efficiency could be improved by doping only 0.01wt% MWCNT into the system. The total shielding effectiveness (SET) value of 0.01wt% MWCNT doped R-PNLC was up to 14.91 dB during frequency band of 5.38 GHz-8.17 GHz. This study demonstrates that the films are potentially useful for low-energy-consumption smart windows with enhanced electromagnetic shielding capability.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"135 S235","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140428883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Interaction between Surface Acoustic Wave and Quantum Hall Effects 表面声波与量子霍尔效应之间的相互作用

Chinese Physics Letters Pub Date : 2024-02-07 DOI: 10.1088/0256-307x/41/4/047301

Xiao Liu, Mengmeng Wu, Renfei Wang, Xinghao Wang, Wenfeng Zhang, Yujiang Dong, Rui-Rui Du, Yang Liu, Xi Lin

引用次数: 0

Interception of layered LP-N and HLP-N at ambient conditions by confined template 封闭模板在环境条件下拦截分层 LP-N 和 HLP-N

Chinese Physics Letters Pub Date : 2024-01-26 DOI: 10.1088/0256-307x/41/3/036101

Dong-Xue Wang, Jing Fu, Yi Li, Zhen Yao, Shuang Liu, Bing-Bing Liu

引用次数: 0

Intense mid-infrared laser pulse generated via flying-mirror red-shifting in near-critical-density plasmas 在近临界密度等离子体中通过飞镜红移产生的强中红外激光脉冲

Chinese Physics Letters Pub Date : 2024-01-23 DOI: 10.1088/0256-307x/41/2/024101

Yu Lu, Dong-Ao Li, Qianni Li, F. Shao, Tong-Pu Yu

引用次数: 0

Strong anisotropic order parameters at all-nitride ferromagnet/superconductor interfaces 全氮化铁磁体/超导体界面的强各向异性阶次参数

Chinese Physics Letters Pub Date : 2024-01-23 DOI: 10.1088/0256-307x/41/2/027402

Qiao Jin, Meng Yang, Guozhu Song, Nan Zhao, S. Chen, Haitao Hong, Ting Cui, Dongke Rong, Qianying Wang, Yiyan Fan, Chen Ge, Can Wang, Jiachang Bi, Yanwei Cao, Liusuo Wu, Shanmin Wang, K J Jin, Zhi-Gang Cheng, Er-Jia Guo

{"title":"Strong anisotropic order parameters at all-nitride ferromagnet/superconductor interfaces","authors":"Qiao Jin, Meng Yang, Guozhu Song, Nan Zhao, S. Chen, Haitao Hong, Ting Cui, Dongke Rong, Qianying Wang, Yiyan Fan, Chen Ge, Can Wang, Jiachang Bi, Yanwei Cao, Liusuo Wu, Shanmin Wang, K J Jin, Zhi-Gang Cheng, Er-Jia Guo","doi":"10.1088/0256-307x/41/2/027402","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/027402","url":null,"abstract":"\u0000 Proximity effects between superconductors and ferromagnets (SC/FM) hold paramount importance in comprehending the spin competition transpiring at their interfaces. This competition arises from the interplay between Cooper pairs and ferromagnetic exchange interactions. The proximity effects between transition metal nitrides (TMNs) are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM interfaces. In this work, we fabricated heterostructures comprising SC titanium nitride (TiN) and FM iron nitride (Fe3N) with precise chemical compositions and atomically well-defined interfaces. The magnetoresistance of Fe3N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external perturbations. Moreover, the superconducting transition temperature (T\u0000 C) and critical field of TiN experience notable suppression when proximity to Fe3N. We observe the intriguing competition of interfacial spin orientations near T\u0000 C (~1.25 K). These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets, but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"130 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139604936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering quantum criticality for quantum dot power harvesting 为量子点功率采集设计量子临界点

Chinese Physics Letters Pub Date : 2024-01-18 DOI: 10.1088/0256-307x/41/2/020503

Jin-Yi Wang, Lei-Lei Nian, Jing-Tao Lü

引用次数: 0