转角双层石墨烯中的新发现:手性诱导的单向磁阻效应  

New discovery in twisted bilayer graphene:Chirality-induced giant unidirectional magnetoresistance

作　　者：戴慧佳 马天星[1] DAI HuiJia;MA TianXing(Department of Physics,Beijing Normal University,Beijing 100875,China)

机构地区：[1]北京师范大学物理学系,北京100875

出　　处：《中国科学：物理学、力学、天文学》2021年第10期138-140,共3页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11974049,11774033);北京市自然科学基金(编号:1192011)资助项目。

摘　　要：转角双层石墨烯中具有许多与平带和手性晶格结构相关的新奇电子现象,如超导电性、Mott绝缘态、反常的磁性等.最近,研究人员计算发现转角双层石墨烯中的手性可以诱导出显著的单向磁阻.单向磁阻代表了类似二极管的电流整流,并且可以将电磁辐射转换为传输电流,以进行能量收集和光电检测等.这一发现揭示了转角双层石墨烯在电子输运方面的独特性质和应用潜力.Twisted bilayer graphene(TBG)exhibits fascinating correlation-driven phenomena,such as the superconductivity and a Mott insulating state,with flat bands and a chiral lattice structure.Recently,based on quantum-transport calculations,scientists claimed that chirality leads to a giant unidirectional magnetoresistance(UMR)in TBG.The giant UMR represents diode-like current rectification and can convert radiation(e.g.,terahertz)into the current for energy-harvesting and photodetection.This discovery has revealed more novel physical properties of the TBG and inspired researchers to explore other chiral bilayer structure materials.

关 键 词：转角双层石墨烯 手性 单向磁阻 

分 类 号：TQ127.11[化学工程—无机化工]