Observation of quadratic magnetoresistance in twisted double bilayer graphene  

作　　者：Yanbang Chu Le Liu Yiru Ji Jinpeng Tian Fanfan Wu Jian Tang Yalong Yuan Yanchong Zhao Xiaozhou Zan Rong Yang Kenji Watanabe Takashi Taniguchi Dongxia Shi Wei Yang Guangyu Zhang 褚衍邦;刘乐;季怡汝;田金朋;吴帆帆;汤建;袁亚龙;赵岩翀;昝晓州;杨蓉;Kenji Watanabe;Takashi Taniguchi;时东霞;杨威;张广宇(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Research Center for Functional Materials,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan;International Center for Materials Nanoarchitectonics,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China [4]Research Center for Functional Materials,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan [5]International Center for Materials Nanoarchitectonics,National Institute for Materials Science,1-1 Namiki,Tsukuba 305-0044,Japan

出　　处：《Chinese Physics B》2022年第10期273-277,共5页中国物理B（英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2020YFA0309600);the National Natural Science Foundation of China (Grant Nos. 61888102, 11834017, and 12074413);the Strategic Priority Research Program of CAS (Grant Nos. XDB30000000 and XDB33000000);the Key-Area Research and Development Program of Guangdong Province (Grant No. 2020B0101340001);supported by the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001, JSPS KAKENHI (Grant No. JP20H00354);A3 Foresight by JSPS。

摘　　要：Magnetoresistance(MR) provides rich information about Fermi surface, carrier scatterings, and exotic phases for a given electronic system. Here, we report a study of the magnetoresistance for the metallic states in twisted double bilayer graphene(TDBG). We observe quadratic magnetoresistance in both Moiré valence band(VB) and Moiré conduction band(CB). The scaling analysis shows validity of Kohler's rule in the Moiré valence band. On the other hand, the quadratic magnetoresistance appears near the halo structure in the Moiré conduction band, and it violates Kohler's rule, demonstrating the MR scaling related to band structure in TDBG. We also propose an alternative scaling near the halo structure. Further analysis implies that the observed quadratic magnetoresistance and alternative scaling in conduction band are related to the halo boundary. Our results may inspire investigation on MR in twisted 2D materials and provide new knowledge for MR study in condensed matter physics.

关 键 词：twisted double bilayer graphene Kohler's rule magnetoresistance scaling critical behavior 

分 类 号：O469[理学—凝聚态物理]