Chinese Physics Letters最新文献_第8页

Phonon thermal transport at the interfaces of graphene/vertically aligned carbon nanotubes /hexagonal boron nitride sandwich heterostructure 石墨烯/垂直排列碳纳米管/六方氮化硼三明治异质结构界面的声子热传输

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/41/1/016302

Menglin Li, M. A. Shakoori, Ruipeng Wang, Haipeng Li

{"title":"Phonon thermal transport at the interfaces of graphene/vertically aligned carbon nanotubes /hexagonal boron nitride sandwich heterostructure","authors":"Menglin Li, M. A. Shakoori, Ruipeng Wang, Haipeng Li","doi":"10.1088/0256-307x/41/1/016302","DOIUrl":"https://doi.org/10.1088/0256-307x/41/1/016302","url":null,"abstract":"\u0000 In this paper, molecular dynamics simulation is used to calculate the interfacial thermal resistance (ITR) of the graphene/carbon nanotubes/hexagonal boron nitride (Gr/CNTs/hBN) sandwich heterostructure, of which vertically aligned carbon nanotube (VACNT) arrays is covalently bonded to graphene and hexagonal boron nitride layers. We found that the ITR of the Gr/VACNT/hBN sandwich heterostructure is 1-2 orders of magnitude smaller than the ITR of the Gr/hBN Van der Waals heterostructure with the same plane size. It is observed that the covalent bonding effectively enhances the phonon coupling between Gr and hBN layers, resulting in an increase in the overlap factor of phonon density of state between Gr and hBN, thus reducing the ITR of Gr and hBN. In addition, the chirality, size (diameter and length) and packing density of sandwich-layer VACNT have an important influence on the ITR of the heterostructure. Under the same diameter and length of CNT, the ITR of the sandwich heterostructure with armchair-shaped VACNT is higher than that of the sandwich heterostructure with zigzag-shaped VACNT, due to the different chemical bonding of chiral CNT with Gr and hBN. When the armchairshaped CNT diameter increases or the length decreases, the ITR of the sandwich heterostructure tends to decrease. Moreover, the increase in the packing density of VACNT has also led to a continuous decrease in the ITR of the sandwich heterostructure, attributed to the extremely high intrinsic thermal conductivity of CNT and the increase of out-ofplane heat transfer channels. This work will help to understand the mechanism for ITR for multi-layer vertical heterostructures, and provide theoretical guidance for a new strategy to regulate the inter-layer thermal resistance of heterostructures by optimizing the design of sandwich layer thermal interface materials.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"33 S123","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138623219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Chiral Dirac Fermion in a Collinear Antiferromagnet 共线反铁磁体中的手性狄拉克费米子

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/126101

Ao Zhang, Ke Deng, Jieming Sheng, Pengfei Liu, Shiv Kumar, Kenya Shimada, Zhicheng Jiang, Zhengtai Liu, Dawei Shen, Jiayu Li, Jun Ren, Le Wang, Liang Zhou, Yoshihisa Ishikawa, Takashi Ohhara, Qiang Zhang, Garry McIntyre, Dehong Yu, Enke Liu, Liusuo Wu, Chaoyu Chen, Qihang Liu

{"title":"Chiral Dirac Fermion in a Collinear Antiferromagnet","authors":"Ao Zhang, Ke Deng, Jieming Sheng, Pengfei Liu, Shiv Kumar, Kenya Shimada, Zhicheng Jiang, Zhengtai Liu, Dawei Shen, Jiayu Li, Jun Ren, Le Wang, Liang Zhou, Yoshihisa Ishikawa, Takashi Ohhara, Qiang Zhang, Garry McIntyre, Dehong Yu, Enke Liu, Liusuo Wu, Chaoyu Chen, Qihang Liu","doi":"10.1088/0256-307x/40/12/126101","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/126101","url":null,"abstract":"In a Dirac semimetal, the massless Dirac fermion has zero chirality, leading to surface states connected adiabatically to a topologically trivial surface state as well as vanishing anomalous Hall effect. Recently, it is predicted that in the nonrelativistic limit of certain collinear antiferromagnets, there exists a type of chiral “Dirac-like” fermion, whose dispersion manifests four-fold degenerate crossing points formed by spin-degenerate linear bands, with topologically protected Fermi arcs. Such an unconventional chiral fermion, protected by a hidden <italic toggle=\"yes\">SU</italic>(2) symmetry in the hierarchy of an enhanced crystallographic group, namely spin space group, is not experimentally verified yet. Here, by angle-resolved photoemission spectroscopy measurements, we reveal the surface origin of the electron pocket at the Fermi surface in collinear antiferromagnet CoNb3S6. Combining with neutron diffraction and first-principles calculations, we suggest a multidomain collinear antiferromagnetic configuration, rendering the the existence of the Fermi-arc surface states induced by chiral Dirac-like fermions. Our work provides spectral evidence of the chiral Dirac-like fermion caused by particular spin symmetry in CoNb3S6, paving an avenue for exploring new emergent phenomena in antiferromagnets with unconventional quasiparticle excitations.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"87 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Simulation Prediction of Heat Transport with Machine Learning in Tokamak Plasmas 利用机器学习对托卡马克等离子体中的热传输进行模拟预测

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/125201

Hui Li, Yan-Lin Fu, Ji-Quan Li, Zheng-Xiong Wang

引用次数: 0

Multi-Pseudo Peakons in the b-Family Fifth-Order Camassa–Holm Model b 族五阶卡马萨-霍尔姆模型中的多伪峰子

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/120202

Dinghao Zhu, Xiaodong Zhu

引用次数: 0

All optical switches for optical soliton interactions in a birefringent fiber 用于双折射光纤中光孤子相互作用的全光开关

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/124204

Xin Zhang, Houhui Yi, Yanli Yao, Shubin Wang, Lingxian Shi

引用次数: 0

Bounding Free Energy Difference with Flow Matching 用流动匹配限定自由能差

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/120201

Lu Zhao, Lei Wang

引用次数: 0

Realizations, Characterizations, and Manipulations of Two-Dimensional Electron Systems Floating above Superfluid Helium Surfaces 漂浮在超流体氦表面上的二维电子系统的实现、特征和操作

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/127301

Haoran Wei, Mengmeng Wu, Renfei Wang, Mingcheng He, Hiroki Ikegami, Yang Liu, Zhi Gang Cheng

{"title":"Realizations, Characterizations, and Manipulations of Two-Dimensional Electron Systems Floating above Superfluid Helium Surfaces","authors":"Haoran Wei, Mengmeng Wu, Renfei Wang, Mingcheng He, Hiroki Ikegami, Yang Liu, Zhi Gang Cheng","doi":"10.1088/0256-307x/40/12/127301","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127301","url":null,"abstract":"Electron systems in low dimensions are enriched with many superior properties for both fundamental research and technical developments. Wide tunability of electron density, high mobility of motion, and feasible controllability in microscales are the most prominent advantages that researchers strive for. Nevertheless, it is always difficult to fulfill all in one solid-state system. Two-dimensional electron systems (2DESs) floating above the superfluid helium surfaces are thought to meet these three requirements simultaneously, ensured by the atomic smoothness of surfaces and the electric neutrality of helium. Here we report our recent work in preparing, characterizing, and manipulating 2DESs on superfluid helium. We realized a tunability of electron density over one order of magnitude and tuned their transport properties by varying electron distribution and measurement frequency. The work we engage in is crucial for advancing research in many-body physics and for development of single-electron quantum devices rooted in these electron systems.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"205 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Highly Anisotropic Magnetism and Nearly Isotropic Magnetocaloric Effect in Mn3Sn2 Single Crystals Mn3Sn2 单晶中的高各向异性磁性和近乎各向同性的磁焦效应

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-12-01 DOI: 10.1088/0256-307x/40/12/127501

Jianli Bai, Qingxin Dong, Libo Zhang, Qiaoyu Liu, Jingwen Cheng, Pinyu Liu, Cundong Li, Yingrui Sun, Yu Huang, Zhian Ren, Genfu Chen

{"title":"Highly Anisotropic Magnetism and Nearly Isotropic Magnetocaloric Effect in Mn3Sn2 Single Crystals","authors":"Jianli Bai, Qingxin Dong, Libo Zhang, Qiaoyu Liu, Jingwen Cheng, Pinyu Liu, Cundong Li, Yingrui Sun, Yu Huang, Zhian Ren, Genfu Chen","doi":"10.1088/0256-307x/40/12/127501","DOIUrl":"https://doi.org/10.1088/0256-307x/40/12/127501","url":null,"abstract":"Mn3Sn2 has been proposed as an ideal material for magnetic refrigeration. It undergoes two successive ferromagnetic transitions (<italic toggle=\"yes\">T</italic>\u0000C1 = 262 K and <italic toggle=\"yes\">T</italic>\u0000C2 = 227 K) and one antiferromagnetic transition (<italic toggle=\"yes\">T</italic>\u0000N = 192 K). Herein we report, for the first time, the preparation of single crystals of Mn3Sn2 from Bi flux. The resultant anisotropic magnetic properties and magnetocaloric effect are investigated along the three principal crystallographic directions of the crystal. Significant anisotropy of magnetic susceptibility and multiple field-induced metamagnetic transitions were found at low fields, whereas the magnetocaloric effect was found to be almost isotropic and larger than that of the polycrystalline one. The maximum magnetic entropy change amounts to −Δ<italic toggle=\"yes\">S</italic>\u0000M = 4.01 J⋅kg−1⋅K−1 near <italic toggle=\"yes\">T</italic>\u0000C1 under a magnetic field change of <italic toggle=\"yes\">μ</italic>\u00000Δ<italic toggle=\"yes\">H</italic> = 5 T along the <italic toggle=\"yes\">c</italic>-axis, with the corresponding refrigerant capacity of 1750 mJ⋅cm−3. Combined with a much wider cooling temperature span (∼ 80 K), our results demonstrate Mn3Sn2 single crystal to be an attractive candidate working material for active magnetic refrigeration at low temperatures.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"78 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139057874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Magnetic topological Dirac semimetal transition driven by SOC in EuMg2Bi2 EuMg2Bi2 中由 SOC 驱动的磁拓扑狄拉克半金属转变

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-29 DOI: 10.1088/0256-307x/41/1/017101

J. M. Wang, H. J. Qian, Q. Jiang, S. Qiao, M. Ye

引用次数: 0

Optical-microwave entanglement paves the way for distributed quantum computation 光微波纠缠为分布式量子计算铺平道路

IF 3.5 2区物理与天体物理

Chinese Physics Letters Pub Date : 2023-11-28 DOI: 10.1088/0256-307x/41/1/014203

Zhifeng Hu, Kai Xu, Yu-Xiang Zhang, Bei-Bei Li

引用次数: 0