Chinese Physics B最新文献_第9页

Gate-field control of valley polarization in valleytronics 山谷电子学中山谷极化的栅场控制

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-18 DOI: 10.1088/1674-1056/ad401a

Ting-Ting Zhang, Yilin Han, Run-Wu Zhang, Zhi-Ming Yu

{"title":"Gate-field control of valley polarization in valleytronics","authors":"Ting-Ting Zhang, Yilin Han, Run-Wu Zhang, Zhi-Ming Yu","doi":"10.1088/1674-1056/ad401a","DOIUrl":"https://doi.org/10.1088/1674-1056/ad401a","url":null,"abstract":"\u0000 Valleytronics materials are a kind of special semiconductors, which can host multiple symmetryconnected and well-separated electron or hole pockets in the Brillouin zone when the system is slightly n or p doped. Since the low-energy particles residing in these pockets generally are not easily scattered to each other by small perturbations, they are endowed with an additional valley degree of freedom. Analogous to spin, the valley freedom can be used to process information, leading to the concept of valleytronics. The prerequisite for valleytronics is the generation of valley polarization. Thus, a focus in this field is achieving electric generation of valley polarization, especially the static generation by the gate electric field alone. In this work, we briefly review the latest progress in this research direction, focusing on the concepts of the couplings between valley and layer, i.e. the valley-layer coupling which permits the gate-field control of the valley polarization, the couplings between valley, layer, and spin in magnetic systems, the physical properties, the novel designing schemes for electronics devices, and the material realizations of the gate-controlled valleytronics materials.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140686636","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

Experimental observation of a Fermi-level flat band in a novel kagome Metal CeNi5 新型卡戈米金属 CeNi5 中费米级平带的实验观测

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-18 DOI: 10.1088/1674-1056/ad4019

Xuezhi Chen, Le Wang, Shuai Zhang, Renjie Zhang, Yiwei Cheng, Yudong Hu, Chengnuo Meng, Zhengtai Liu, Baiqing Lv, Yaobo Huang

{"title":"Experimental observation of a Fermi-level flat band in a novel kagome Metal CeNi5","authors":"Xuezhi Chen, Le Wang, Shuai Zhang, Renjie Zhang, Yiwei Cheng, Yudong Hu, Chengnuo Meng, Zhengtai Liu, Baiqing Lv, Yaobo Huang","doi":"10.1088/1674-1056/ad4019","DOIUrl":"https://doi.org/10.1088/1674-1056/ad4019","url":null,"abstract":"\u0000 Kagome materials are a class of materials with a lattice structure composed of corner-sharing triangles that give rise to various exotic electronic phenomena, such as Dirac fermions, van Hove singularities, and flat bands. However, most of the known kagome materials have a flat band detached from the Fermi energy, limiting the investigation of the emergent flat band physics. By combining soft X-ray angle-resolved resolved photoemission spectroscopy (ARPES) and the first-principles calculations, we reveal the electronic structure of a novel kagome metal CeNi5 with a clear dispersion along kz\u0000 direction and a Fermi level flat band on the Γ-K-M-Γ plane. Besides, resonant ARPES experiments results indicate a near 4+ valence state of Ce ions, which is consistent with the transport measurements. Our results demonstrate the unique electronic properties of CeNi5 as a new kagome metal and provide an ideal platform for exploring the flat band physics as well as the interaction between different types of flat bands by tuning the valence state of Ce ions.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140687084","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

Atomic transport dynamics in crossed optical dipole trap 交叉光偶极子陷阱中的原子传输动力学

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-18 DOI: 10.1088/1674-1056/ad401c

Peng Peng, Zhengxi Zhang, Yaoyuan Fan, Guoling Yin, Dekai Mao, Xuzong Chen, Wei Xiong, Xiaoji Zhou

{"title":"Atomic transport dynamics in crossed optical dipole trap","authors":"Peng Peng, Zhengxi Zhang, Yaoyuan Fan, Guoling Yin, Dekai Mao, Xuzong Chen, Wei Xiong, Xiaoji Zhou","doi":"10.1088/1674-1056/ad401c","DOIUrl":"https://doi.org/10.1088/1674-1056/ad401c","url":null,"abstract":"\u0000 We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic loss. The loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in the preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the center region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the center region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the center region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for the preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140688474","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

Nonlinear Seebeck and Peltier effects in a Majorana nanowire coupled to leads 与引线耦合的马约拉纳纳米线中的非线性塞贝克效应和珀尔帖效应

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-17 DOI: 10.1088/1674-1056/ad3f99

Chi Feng, Liu Jia, Zhenguo Fu, Liming Liu

{"title":"Nonlinear Seebeck and Peltier effects in a Majorana nanowire coupled to leads","authors":"Chi Feng, Liu Jia, Zhenguo Fu, Liming Liu","doi":"10.1088/1674-1056/ad3f99","DOIUrl":"https://doi.org/10.1088/1674-1056/ad3f99","url":null,"abstract":"\u0000 We study theoretically nonlinear thermoelectric transport through a topological superconductor nanowire hosting Majorana bound states (MBSs) at its two ends, a system named as Majorana nanowire (MNW). We consider that the MNW is coupled to the left and right normal metallic leads subjected to either bias voltage or temperature gradient. We focus our attention on the sign change of nonlinear Seebeck and Peltier coefficients induced by mechanisms related to the MBSs, by which the possible existence of MBSs might be proved. Our results show that for a fixed temperature difference between the two leads, the sign of the nonlinear Seebeck coefficient (thermopower) can be reversed by changing the overlap amplitude between the MBSs or the system equilibrium temperature, which are similar to the cases in linear response regime. By optimizing the MBS-MBS interaction amplitude and system equilibrium temperature, however, we find that the temperature difference may also induce sign change of the nonlinear thermopower. For zero temperature difference and finite bias voltage, both the sign and magnitude of nonlinear Peltier coefficient can be adjusted by changing the bias voltage or overlap amplitude between the MBSs. In the presence of both bias voltage and temperature difference, we show that the electrical current at zero Fermi level and the states induced by overlap between the MBSs keeps unchanged regardless of the amplitude of temperature difference. We also find that the direction of the heat current driven by bias voltage may be changed by weak temperature difference.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140690621","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

Subpicosecond laser ablation behavior of magnesium target and crater evolution: Molecular dynamics study and experimental validation 镁靶的亚皮秒激光烧蚀行为和火山口演化：分子动力学研究与实验验证

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-16 DOI: 10.1088/1674-1056/ad3ef8

Guo-hsiang Jiang, Xia Zhou

引用次数: 0

RKKY interaction in helical higher-order topological insulators 螺旋高阶拓扑绝缘体中的 RKKY 相互作用

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-16 DOI: 10.1088/1674-1056/ad3ef9

Sha Jin, Jian Li, Qing-Xu Li, Jia-Ji Zhu

引用次数: 0

A color image encryption scheme based on 2D coupled chaotic system and diagonal scrambling algorithm 基于二维耦合混沌系统和对角加扰算法的彩色图像加密方案

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-16 DOI: 10.1088/1674-1056/ad3efa

Jingming Su, Yan Hong, Shihui Fang, Yan Wen

{"title":"A color image encryption scheme based on 2D coupled chaotic system and diagonal scrambling algorithm","authors":"Jingming Su, Yan Hong, Shihui Fang, Yan Wen","doi":"10.1088/1674-1056/ad3efa","DOIUrl":"https://doi.org/10.1088/1674-1056/ad3efa","url":null,"abstract":"\u0000 In this research, a novel color image encryption scheme is developed to enhance the security of encryption without increasing the complexity. Firstly, the plain color image is decomposed into three grayscale plain images, which are converted into the frequency domain coefficient matrices (FDCM) with discrete cosine transform (DCT) operation. After that, a 2D coupled chaotic system (2DCS) is developed and used to generate one group of embedded matrices and another group of encryption matrices, respectively. The embedded matrices are integrated with the FDCM to fulfill the frequency domain encryption, and then the inverse DCT processing is implemented to recover the spatial domain signal. Eventually, under the function of the Encryption matrices and the proposed diagonal scrambling algorithm, the final color ciphertext is obtained. The experimental results show that the proposed method can not only ensure efficient encryption but also satisfy various sizes of image encryption. Besides, it has better performance than other similar techniques in statistical feature analysis, such as key space, key sensitivity, anti-differential attack, information entropy, noise attack, etc.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140696636","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

Radiation of a TM mode from an Open End of a Three-Layer Dielectric Capillary 三层电介质毛细管开口端的 TM 模式辐射

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-16 DOI: 10.1088/1674-1056/ad3ef7

S. Galyamin, Alexandr M. Altmark

引用次数: 0

Wavelength-interval Switchable Brillouin-Raman Random Fiber Laser through Brillouin pump manipulation 通过操纵布里渊泵浦实现波长间隔可切换的布里渊-拉曼随机光纤激光器

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-16 DOI: 10.1088/1674-1056/ad3efb

Yang Li, Enming Xu, Rui-Jia Chen, Yu-Gang Shee, Zu-Xing Zhang

{"title":"Wavelength-interval Switchable Brillouin-Raman Random Fiber Laser through Brillouin pump manipulation","authors":"Yang Li, Enming Xu, Rui-Jia Chen, Yu-Gang Shee, Zu-Xing Zhang","doi":"10.1088/1674-1056/ad3efb","DOIUrl":"https://doi.org/10.1088/1674-1056/ad3efb","url":null,"abstract":"\u0000 A wavelength-interval switchable Brillouin-Raman random fiber laser (BRRFL) based on Brillouin pump (BP) manipulation is proposed in this letter. The proposed wavelength-interval switchable BRRFL has a full-open cavity configuration, featuring multiwavelength output with wavelength interval of double Brillouin frequency shifts. Through simultaneously injecting the BP light and its first-order stimulated Brillouin-scattered light into the cavity, the laser output exhibits a wavelength interval of single Brillouin frequency shift. The wavelength-interval switching effect can be manipulated by controlling the power of the first-order stimulated Brillouin scattering light. The experimental results show the multiwavelength output can be switched between double Brillouin frequency shift multiwavelength emission with a broad bandwidth of approximately 60 nm and single Brillouin frequency shift multiwavelength emission of 44 nm. The flexible optically controlled random fiber laser with switchable wavelength interval makes it useful for a wide range of applications and holds significant potential in the field of wavelength-division multiplexing optical communication.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140695211","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

Corrigendum to “Absolute partial and total ionization cross sections of carbon monoxide with electron collision from 350 eV to 8000 eV” 对 "一氧化碳在 350 eV 至 8000 eV 范围内与电子碰撞的绝对部分和总电离截面 "的更正

IF 1.7 4区物理与天体物理

Chinese Physics B Pub Date : 2024-04-16 DOI: 10.1088/1674-1056/ad3efc

Taj Wali Khan, Weizhe Huang, Enliang Wang, X. Shan, Xiangjun Chen

引用次数: 0