Programming correlated magnetic states with gate-controlled moire geometry

被引：37

作者：

Anderson, Eric ^{[1
]}

Fan, Feng-Ren ^{[2
]}

Cai, Jiaqi ^{[1
]}

Holtzmann, William ^{[1
]}

Taniguchi, Takashi ^{[4
]}

Watanabe, Kenji ^{[5
]}

Xiao, Di ^{[1
,6
]}

Yao, Wang ^{[2
,3
]}

Xu, Xiaodong ^{[1
,6
]}

机构：

[1] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[2] Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China

[3] HKU UCAS Joint Inst Theoret & Computat Phys, Hong Kong, Peoples R China

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

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

[6] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA

来源：

SCIENCE | 2023年 / 381卷 / 6655期

关键词：

D O I：

10.1126/science.adg4268

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The ability to control the underlying lattice geometry of a system may enable transitions between emergent quantum ground states. We report in situ gate switching between honeycomb and triangular lattice geometries of an electron many-body Hamiltonian in rhombohedral (R)-stacked molybdenum ditelluride (MoTe2) moire bilayers, resulting in switchable magnetic exchange interactions. At zero electric field, we observed a correlated ferromagnetic insulator near one hole per moire unit cell with a widely tunable Curie temperature up to 14 K. Applying an electric field switched the system into a half-filled triangular lattice with antiferromagnetic interactions; further doping this layer-polarized superlattice tuned the antiferromagnetic exchange interaction back to ferromagnetic. Our work demonstrates R-stacked MoTe2 moires to be a laboratory for engineering correlated states with nontrivial topology.

引用

页码：325 / 330

页数：6

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