Quantum Oscillations in Noncentrosymmetric Weyl Semimetal SmAlSi  

作　　者：Weizheng Cao Yunlong Su Qi Wang Cuiying Pei Lingling Gao Yi Zhao Changhua Li Na Yu Jinghui Wang Zhongkai Liu Yulin Chen Gang Li Jun Li Yanpeng Qi 曹渭征;苏云龙;王琦;裴翠颖;高玲玲;赵毅;李昌华;余娜;王靖珲;柳仲楷;陈宇林;李刚;李军;齐彦鹏(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China;Department of Physics,Clarendon Laboratory,University of Oxford,Parks Road,Oxford OX13PU,UK;Shanghai Key Laboratory of High-resolution Electron Microscopy,ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [2]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [3]Department of Physics,Clarendon Laboratory,University of Oxford,Parks Road,Oxford OX13PU,UK [4]Shanghai Key Laboratory of High-resolution Electron Microscopy,ShanghaiTech University,Shanghai 201210,China

出　　处：《Chinese Physics Letters》2022年第4期67-73,共7页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant Nos.2018YFA0704300 and 2017YFB0503302);the National Natural Science Foundation of China(Grant Nos.U1932217,11974246,12004252,61771234,and 12004251);the Natural Science Foundation of Shanghai(Grant Nos.19ZR1477300 and 20ZR1436100);the Science and Technology Commission of Shanghai Municipality(Grant Nos.19JC1413900 and YDZX20203100001438);the Shanghai Science and Technology Plan(Grant No.21DZ2260400),the Shanghai Sailing Program(Grant No.21YF1429200);the Interdisciplinary Program of Wuhan National High Magnetic Field Center(Grant No.WHMFC202124);the Beijing National Laboratory for Condensed Matter Physics;the support from Analytical Instrumentation Center(Grant No.SPST-AIC10112914);Centre for High-resolution Electron Microscopy(ChEM)(Grant No.EM02161943),SPST,Shanghai Tech University。

摘　　要：As a new type of quantum state of matter hosting low energy relativistic quasiparticles,Weyl semimetals(WSMs)have attracted significant attention for scientific community and potential quantum device applications.In this study,we present a comprehensive investigation of the structural,magnetic,and transport properties of noncentrosymmetric RAl Si(R=Sm,Ce),which have been predicted to be new magnetic WSM candidates.Both samples exhibit nonsaturated magnetoresistance,with about 900%and 80%for Sm Al Si and Ce Al Si,respectively,at temperature of 1.8 K and magnetic field of 9 T.The carrier densities of Sm Al Si and Ce Al Si exhibit remarkable change around magnetic transition temperatures,signifying that the electronic states are sensitive to the magnetic ordering of rare-earth elements.At low temperatures,Sm Al Si reveals prominent Shubnikov–de Haas oscillations associated with the nontrivial Berry phase.High-pressure experiments demonstrate that the magnetic order is robust and survival under high pressure.Our results would yield valuable insights into WSM physics and potentials in applications to next-generation spintronic devices in the RAl Si(R=Sm,Ce)family.

关 键 词：SYMMETRIC QUANTUM nontrivial 

分 类 号：O469[理学—凝聚态物理]