Twisted bilayers of thin film magnetic topological insulators

被引：4

作者：

Chaudhary, Gaurav ^{[1
]}

Burkov, Anton A. ^{[2
,3
]}

Heinonen, Olle G. ^{[1
,4
]}

机构：

[1] Argonne Natl Lab, Mat Sci Div, Lemont, IL 60439 USA

[2] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L3G1, Canada

[3] Perimeter Inst Theoret Phys, Waterloo, ON N2L2Y5, Canada

[4] Seagate Technol, 7801 Comp Ave, Bloomington, MN 55435 USA

来源：

PHYSICAL REVIEW RESEARCH | 2022年 / 4卷 / 04期

关键词：

MAGIC-ANGLE; STATES; GRAPHENE; SUPERCONDUCTIVITY; MODEL;

D O I：

10.1103/PhysRevResearch.4.043034

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Twisted bilayer graphene (TBG) near "magic angles" has emerged as a rich platform for strongly correlated states of two-dimensional (2D) Dirac semimetals. Here we show that twisted bilayers of thin film magnetic topological insulators (MTIs) with large in-plane magnetization can realize flat bands near 2D Dirac nodes. Using a simple model for thin films of MTIs, we derive a continuum model for two such MTIs, twisted by a small angle with respect to each other. When the magnetization is in plane, we show that interlayer tunneling terms act as effective SU(2) vector potentials, which are known to lead to flat bands in TBG. We show that by changing the in-plane magnetization, it is possible to tune the twisted bilayer MTI band dispersion to quadratic band touching or to flat bands, similar to the TBG. If realized, this system can be a highly tunable platform for strongly correlated phases of two-dimensional Dirac semimetals.

引用

页数：13

共 49 条

[1] GROUND-STATE OF A SPIN-1-2 CHARGED-PARTICLE IN A 2-DIMENSIONAL MAGNETIC-FIELD [J].

AHARONOV, Y ;

CASHER, A .

PHYSICAL REVIEW A, 1979, 19 (06) :2461-2462

[2] Failure of Nielsen-Ninomiya Theorem and Fragile Topology in Two-Dimensional Systems with Space-Time Inversion Symmetry: Application to Twisted Bilayer Graphene at Magic Angle [J].

Ahn, Junyeong ;

Park, Sungjoon ;

Yang, Bohm-Jung .

PHYSICAL REVIEW X, 2019, 9 (02)

[3]

[Anonymous], 2013, SCIENCE

[4] General continuum model for twisted bilayer graphene and arbitrary smooth deformations [J].

Balents, Leon .

SCIPOST PHYSICS, 2019, 7 (04)

[5] Excitonic density wave and spin-valley superfluid in bilayer transition metal dichalcogenide [J].

Bi, Zhen ;

Fu, Liang .

NATURE COMMUNICATIONS, 2021, 12 (01)

[6] 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

[7] Wilson loop approach to fragile topology of split elementary band representations and topological crystalline insulators with time-reversal symmetry [J].

Bouhon, Adrien ;

Black-Schaffer, Annica M. ;

Slager, Robert-Jan .

PHYSICAL REVIEW B, 2019, 100 (19)

[8] Quantum anomalies in nodal line semimetals [J].

Burkov, A. A. .

PHYSICAL REVIEW B, 2018, 97 (16)

[9] High-temperature topological superconductivity in twisted double-layer copper oxides [J].

Can, Oguzhan ;

Tummuru, Tarun ;

Day, Ryan P. ;

Elfimov, Ilya ;

Damascelli, Andrea ;

Franz, Marcel .

NATURE PHYSICS, 2021, 17 (04) :519-+

[10] Moire superlattice on the surface of a topological insulator [J].

Cano, Jennifer ;

Fang, Shiang ;

Pixley, J. H. ;

Wilson, Justin H. .

PHYSICAL REVIEW B, 2021, 103 (15)

← 1 2 3 4 5 →