Chinese Physics B最新文献_第3页

A quantum-enhanced magnetometer using a single high-spin nucleus in silicon 利用硅中单个高自旋原子核的量子增强磁力计

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-31 DOI: 10.1088/1674-1056/ad5a75

Tao Xin, 涛辛, Ke Zhang, 科张, Jun Li and 俊李

引用次数: 0

Different topological phase transitions in the Su–Schrieffer–Heeger model under different disorder structures 不同无序结构下苏-施里弗-希格模型的不同拓扑相变

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad59fb

Yan Gu, Zhanpeng Lu

引用次数: 0

Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe2 二维铁磁材料 CrTe2 的电流垂直于平面传输特性

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5af1

Jin Wang, Yu Liu, Taikun Wang, Yongkang Xu, Shuanghai Wang, Kun He, Yafeng Deng, Pengfei Yan, Liang He

{"title":"Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe2","authors":"Jin Wang, Yu Liu, Taikun Wang, Yongkang Xu, Shuanghai Wang, Kun He, Yafeng Deng, Pengfei Yan, Liang He","doi":"10.1088/1674-1056/ad5af1","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5af1","url":null,"abstract":"Heterostructures of van der Waals (vdW) ferromagnetic materials have become a focal point in research of low-dimensional spintronic devices. The current direction in spin valves is commonly perpendicular to the plane (CPP). However, the transport properties of the CPP mode remain largely unexplored. In this work, current-in-plane (CIP) mode and CPP mode for CrTe2 thin films are carefully studied. The temperature-dependent longitudinal resistance transitions from metallic (CIP) to semiconductor behavior (CPP), with the electrical resistivity of CPP increased by five orders of magnitude. More importantly, the transport properties of the CPP can be categorized into a single-gap tunneling-through model with the activation energy (<italic toggle=\"yes\">E</italic>a) of ∼ 1.34 meV/gap at 300–150 K, the variable range hopping model with a linear negative magnetoresistance at 150–20 K, and weak localization region with a nonlinear magnetic resistance below 20 K. This study explores the vertical transport in CrTe2 materials for the first time, contributing to understand its unique properties and to pave the way for its potential in spin valve devices.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"28 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Induced magneto-conductivity in a two-nodeWeyl semimetal under Gaussian random disorder 高斯随机无序条件下双节点韦尔半金属的诱导磁导率

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad59fc

Chuanxiong Xu, Haoping Yu, Mei Zhou, Xuanting Ji

{"title":"Induced magneto-conductivity in a two-nodeWeyl semimetal under Gaussian random disorder","authors":"Chuanxiong Xu, Haoping Yu, Mei Zhou, Xuanting Ji","doi":"10.1088/1674-1056/ad59fc","DOIUrl":"https://doi.org/10.1088/1674-1056/ad59fc","url":null,"abstract":"Measuring the magneto-conductivity induced from impurities may help determine the impurity distribution and reveal the structure of a Weyl semimetal sample. To verify this, we utilize the Gaussian random disorder to simulate charged impurities in a two-node Weyl semimetal model and investigate the impact of charged impurities on magneto-conductivity in Weyl semimetals. We first compute the longitudinal magnetic conductivity and find that it is positive and increases proportionally with the parameter governing the Gaussian distribution of charged impurities, suggesting the presence of negative longitudinal magneto-resistivity. Then we consider both the intra-valley and inter-valley scattering processes to calculate the induced transverse magneto-conductivity in the model. Our findings indicate that both inter-valley and intra-valley scattering processes play important roles in the transverse magneto-conductivity. The locations of Weyl nodes can also be determined by magneto-conductivity measurements. This is possible if the magnetic field strength and the density of charged impurities are known. Alternatively, the measurement of magnetic conductivity may reveal the distribution of charged impurities in a given sample once the locations of the Weyl nodes have been determined. These findings can aid in detecting the structure of a Weyl semimetal sample, enhancing comprehension of magnetotransport in Weyl semimetals and promoting the development of valley electronics.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"20 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pressure generation under deformation in a large-volume press 大容积压力机变形时产生的压力

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad58c6

Saisai Wang, Xinyu Zhao, Kuo Hu, Bingtao Feng, Xuyuan Hou, Yiming Zhang, Shucheng Liu, Yuchen Shang, Zhaodong Liu, Mingguang Yao, Bingbing Liu

{"title":"Pressure generation under deformation in a large-volume press","authors":"Saisai Wang, Xinyu Zhao, Kuo Hu, Bingtao Feng, Xuyuan Hou, Yiming Zhang, Shucheng Liu, Yuchen Shang, Zhaodong Liu, Mingguang Yao, Bingbing Liu","doi":"10.1088/1674-1056/ad58c6","DOIUrl":"https://doi.org/10.1088/1674-1056/ad58c6","url":null,"abstract":"Deformation can change the transition pathway of materials under high pressure, thus significantly affects physical and chemical properties of matters. However, accurate pressure calibration under deformation is challenging and thereby causes relatively large pressure uncertainties in deformation experiments, resulting in the synthesis of complex multiphase materials. Here, pressure generations of three types of deformation assemblies were well calibrated in a Walker-type large-volume press (LVP) by electrical resistance measurements combined with finite element simulations (FESs). Hard Al2O3 or diamond pistons in shear and uniaxial deformation assemblies significantly increase the efficiency of pressure generation compared with the conventional quasi-hydrostatic assembly. The uniaxial deformation assembly using flat diamond pistons possesses the highest efficiency in these deformation assemblies. This finding is further confirmed by stress distribution analysis based on FESs. With this deformation assembly, we found shear can effectively promote the transformation of C60 into diamond under high pressure and realized the synthesis of phase-pure diamond at relatively moderate pressure and temperature conditions. The present developed techniques will help improve pressure efficiencies in LVP and explore the new physical and chemical properties of materials under deformation in both science and technology.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"139 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of ion species on extraction characteristics of mixed ion beams 离子种类对混合离子束萃取特性的影响

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5c3d

Ao Xu, Pingping Gan, Xiang Wan, Yuanjie Shi

{"title":"Influence of ion species on extraction characteristics of mixed ion beams","authors":"Ao Xu, Pingping Gan, Xiang Wan, Yuanjie Shi","doi":"10.1088/1674-1056/ad5c3d","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5c3d","url":null,"abstract":"The spatial distributions of different kinds of ions are usually not completely the same in the process of extracting. In order to study the reason for the different characteristics of ion extraction, a simplified simulation model of Cu+ and Cr+ ions extraction process was established by 2D3V (two-dimensional in space and three-dimensional in velocity space) particle-in-cell (PIC) method. The effects of different extraction voltages from 0 V to 500 V on the density distribution of Cu+ and Cr+ ions and the change of plasma emission surface were analyzed. On the basis of this model, the ion density distribution characteristics of Cu+ ions mixed with Li+, Mg+, K+, Fe+, Y+, Ag+, Xe+, Au+, and Pb+ ions respectively under 200-V extraction voltage are further simulated, and it is revealed that the atomic mass of the ions is the key reason for different ion density distributions when different kinds of ions are mixed and extracted, which provides support for further understanding of ion extraction characteristics.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"32 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variational data encoding and correlations in quantum-enhanced machine learning 量子增强型机器学习中的变量数据编码和相关性

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5c3b

Ming-Hao Wang, Hua Lü

{"title":"Variational data encoding and correlations in quantum-enhanced machine learning","authors":"Ming-Hao Wang, Hua Lü","doi":"10.1088/1674-1056/ad5c3b","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5c3b","url":null,"abstract":"Leveraging the extraordinary phenomena of quantum superposition and quantum correlation, quantum computing offers unprecedented potential for addressing challenges beyond the reach of classical computers. This paper tackles two pivotal challenges in the realm of quantum computing: firstly, the development of an effective encoding protocol for translating classical data into quantum states, a critical step for any quantum computation. Different encoding strategies can significantly influence quantum computer performance. Secondly, we address the need to counteract the inevitable noise that can hinder quantum acceleration. Our primary contribution is the introduction of a novel variational data encoding method, grounded in quantum regression algorithm models. By adapting the learning concept from machine learning, we render data encoding a learnable process. This allowed us to study the role of quantum correlation in data encoding. Through numerical simulations of various regression tasks, we demonstrate the efficacy of our variational data encoding, particularly post-learning from instructional data. Moreover, we delve into the role of quantum correlation in enhancing task performance, especially in noisy environments. Our findings underscore the critical role of quantum correlation in not only bolstering performance but also in mitigating noise interference, thus advancing the frontier of quantum computing.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"7 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolutionary dynamics of tax-based strong altruistic reward and punishment in a public goods game 公共物品博弈中基于税收的强利他奖惩的进化动态

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5274

Zhi-Hao Yang, Yan-Long Yang

引用次数: 0

Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration 基于光学频率梳校准的频率调制连续波多路复用气体传感技术

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad5980

Linhua Jia, Xinghua Qu, Fumin Zhang

{"title":"Frequency-modulated continuous-wave multiplexed gas sensing based on optical frequency comb calibration","authors":"Linhua Jia, Xinghua Qu, Fumin Zhang","doi":"10.1088/1674-1056/ad5980","DOIUrl":"https://doi.org/10.1088/1674-1056/ad5980","url":null,"abstract":"Laser absorption spectroscopy has proven to be an effective approach for gas sensing, which plays an important role in the fields of military, industry, medicine and basic research. This paper presents a multiplexed gas sensing system based on optical frequency comb (OFC) calibrated frequency-modulated continuous-wave (FMCW) tuning nonlinearity. The system can be used for multi-parameter synchronous measurement of gas absorption spectrum and multiplexed optical path. Multi-channel parallel detection is realized by combining wavelength division multiplexing (WDM) and frequency division multiplexing (FDM) techniques. By introducing nonlinear optical crystals, broadband spectrum detection is simultaneously achieved over a bandwidth of hundreds of nanometers. An OFC with ultra-high frequency stability is used as the frequency calibration source, which guarantees the measurement accuracy. The test samples involve H13C14N, C2H2 and Rb vapor cells of varying densities and 5 parallel measurement experiments are designed. The results show that the measurement accuracies of spectral absorption line and the optical path are 150 MHz and 20 μm, respectively. The scheme offers the advantages of multiplexed, multi-parameter, wide spectrum and high resolution detection, which can realize the identification of multi-gas components and the high-precision inversion of absorption lines under different environments. The proposed sensor demonstrates great potential in the field of high-resolution absorption spectrum measurement for gas sensing applications.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"9 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lewis acid-doped transition metal dichalcogenides for ultraviolet–visible photodetectors 用于紫外-可见光光电探测器的路易斯酸掺杂过渡金属二钙化物

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-08-01 DOI: 10.1088/1674-1056/ad597f

Heng Yang, Mingjun Ma, Yongfeng Pei, Yufan Kang, Jialu Yan, Dong He, Changzhong Jiang, Wenqing Li, Xiangheng Xiao

引用次数: 0