Magnetic Field-Stabilized Wigner Crystal States in a Graphene Moire Superlattice

被引：10

作者：

Chen, Guorui ^{[5
,6
]}

Zhang, Ya-Hui ^{[1
]}

Sharpe, Aaron ^{[2
,3
,4
]}

Zhang, Zuocheng ^{[5
]}

Wang, Shaoxin ^{[5
]}

Jiang, Lili ^{[5
]}

Lyu, Bosai ^{[6
]}

Li, Hongyuan ^{[5
]}

Watanabe, Kenji ^{[7
]}

Taniguchi, Takashi ^{[8
]}

Shi, Zhiwen ^{[6
]}

Goldhaber-Gordon, David ^{[3
,9
]}

Zhang, Yuanbo ^{[10
,11
]}

Wang, Feng ^{[5
,12
,13
,14
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[3] Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[4] Sandia Natl Labs, Quantum & Elect Mat Dept, Livermore, CA 94550 USA

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Shenyang Natl Lab Mat Sci,Minist Educ, Shanghai 200240, Peoples R China

[7] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba 3050044, Japan

[8] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba 3050044, Japan

[9] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[10] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[11] Fudan Univ, Inst Nanoelect Devices & Quantum Comp, Shanghai 200433, Peoples R China

[12] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

[13] Univ Calif Berkeley, Kavli Energy NanoSci Inst, Berkeley, CA 94720 USA

[14] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2023年 / 23卷 / 15期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

graphene; moire superlattice; Wigner crystal; Hofstadter butterfly; Mott insulator; flat band; DIRAC FERMIONS; INSULATOR; ELECTRONS; MOTT;

D O I：

10.1021/acs.nanolett.3c01741

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

ABC-stacked trilayer graphene on boron nitride (ABC-TLG/hBN) moire superlattices provides a tunable platform for exploring Wigner crystal states in which the electron correlation can be controlled by electric and magnetic fields. Here we report the observation of magnetic field-stabilized Wigner crystal states in a ABC-TLG/hBN. We show that correlated insulating states emerge at multiple fractional and integer fillings corresponding to nu = (1)/(3), (2)/(3), 1, (4)/(3), (5)/(3), and 2 electrons per moire lattice site under a magnetic field. These correlated insulating states can be attributed to generalized Mott states for the integer fillings and generalized Wigner crystal states for the fractional fillings. The generalized Wigner crystal states are stabilized by a vertical magnetic field and are strongest at one magnetic flux quantum per three moire superlattices. The nu = 2 insulating state persists up to 30 T, which can be described by a Mott-Hofstadter transition at a high magnetic field.

引用

页码：7023 / 7028

页数：6

共 20 条

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