Berry curvature dipole senses topological transition in a moire superlattice

被引:108
作者
Sinha, Subhajit [1 ]
Adak, Pratap Chandra [1 ]
Chakraborty, Atasi [2 ]
Das, Kamal [2 ]
Debnath, Koyendrila [3 ]
Sangani, L. D. Varma [1 ]
Watanabe, Kenji [4 ]
Taniguchi, Takashi [5 ]
Waghmare, Umesh, V [3 ]
Agarwal, Amit [2 ]
Deshmukh, Mandar M. [1 ]
机构
[1] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Mumbai, Maharashtra, India
[2] Indian Inst Technol, Dept Phys, Kanpur, Uttar Pradesh, India
[3] Jawaharlal Nehru Ctr Adv Sci Res, Theoret Sci Unit, Bangalore, Karnataka, India
[4] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba, Ibaraki, Japan
[5] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki, Japan
关键词
GRAPHENE; BANDS;
D O I
10.1038/s41567-022-01606-y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Topological aspects of the electron wave function-including the Berry curvature and Chern number-play a crucial role in determining the physical properties of materials. Although the Berry curvature and its effects in materials have been studied(1,)(2), detecting changes in the Chern number can be challenging, particularly changes in the valley Chern type. In this regard, twisted double bilayer graphene(3-7) has emerged as a promising platform to gain electrical control over the Berry curvature hotspots(8) and the valley Chern numbers of topological flat bands(9,10). In addition, strain-induced breaking of the threefold rotation symmetry leads to a non-zero first moment of Berry curvature (called the Berry curvature dipole)(11). Here we show that a sign change in the Berry curvature dipole detects topological transitions in the bands. In twisted double bilayer graphene, the perpendicular electric field simultaneously tunes the valley Chern number and Berry curvature dipole, providing a tunable system to probe the topological transitions. Furthermore, we find hysteresis in the transport response that is caused by switching of the electric polarization. This holds promise for next-generation Berry-curvature-based memory devices. Our technique can be emulated in three-dimensional topological systems to probe topological transitions governed by parameters such as pressure or anisotropic strain.
引用
收藏
页码:765 / +
页数:13
相关论文
共 46 条
[1]   Tunable bandwidths and gaps in twisted double bilayer graphene on the verge of correlations [J].
Adak, Pratap Chandra ;
Sinha, Subhajit ;
Ghorai, Unmesh ;
Sangani, L. D. Varma ;
Watanabe, Kenji ;
Taniguchi, Takashi ;
Sensarma, Rajdeep ;
Deshmukh, Mandar M. .
PHYSICAL REVIEW B, 2020, 101 (12)
[2]   Moire bands in twisted double-layer graphene [J].
Bistritzer, Rafi ;
MacDonald, Allan H. .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2011, 108 (30) :12233-12237
[3]   Correlated Insulating States in Twisted Double Bilayer Graphene [J].
Burg, G. William ;
Zhu, Jihang ;
Taniguchi, Takashi ;
Watanabe, Kenji ;
MacDonald, Allan H. ;
Tutuc, Emanuel .
PHYSICAL REVIEW LETTERS, 2019, 123 (19)
[4]   Tunable correlated states and spin-polarized phases in twisted bilayer-bilayer graphene [J].
Cao, Yuan ;
Rodan-Legrain, Daniel ;
Rubies-Bigorda, Oriol ;
Park, Jeong Min ;
Watanabe, Kenji ;
Taniguchi, Takashi ;
Jarillo-Herrero, Pablo .
NATURE, 2020, 583 (7815) :215-+
[5]   Correlated insulator behaviour at half-filling in magic-angle graphene superlattices [J].
Cao, Yuan ;
Fatemi, Valla ;
Demir, Ahmet ;
Fang, Shiang ;
Tomarken, Spencer L. ;
Luo, Jason Y. ;
Sanchez-Yamagishi, Javier D. ;
Watanabe, Kenji ;
Taniguchi, Takashi ;
Kaxiras, Efthimios ;
Ashoori, Ray C. ;
Jarillo-Herrero, Pablo .
NATURE, 2018, 556 (7699) :80-+
[6]   Unconventional superconductivity in magic-angle graphene superlattices [J].
Cao, Yuan ;
Fatemi, Valla ;
Fang, Shiang ;
Watanabe, Kenji ;
Taniguchi, Takashi ;
Kaxiras, Efthimios ;
Jarillo-Herrero, Pablo .
NATURE, 2018, 556 (7699) :43-+
[7]   Flat bands in twisted double bilayer graphene [J].
Chebrolu, Narasimha Raju ;
Chittari, Bheema Lingam ;
Jung, Jeil .
PHYSICAL REVIEW B, 2019, 99 (23)
[8]   Symmetry-broken Chern insulators and Rashba-like Landau-level crossings in magic-angle bilayer graphene [J].
Das, Ipsita ;
Lu, Xiaobo ;
Herzog-Arbeitman, Jonah ;
Song, Zhi-Da ;
Watanabe, Kenji ;
Taniguchi, Takashi ;
Bernevig, B. Andrei ;
Efetov, Dmitri K. .
NATURE PHYSICS, 2021, 17 (06) :710-+
[9]   Nonlinear Hall effects [J].
Du, Z. Z. ;
Lu, Hai-Zhou ;
Xie, X. C. .
NATURE REVIEWS PHYSICS, 2021, 3 (11) :744-752
[10]   Disorder-induced nonlinear Hall effect with time-reversal symmetry [J].
Du, Z. Z. ;
Wang, C. M. X. ;
Li, Shuai ;
Lu, Hai-Zhou ;
Xie, X. C. .
NATURE COMMUNICATIONS, 2019, 10 (1)