Unconventional ferroelectricity in half-filling states of antiparallel stacking of twisted WSe<sub>2</sub>

An Liheng; Zhou Zishu; Feng Xuemeng; Huang Meizhen; Cai Xiangbin; Chen Yong; Zhao Pei; Dai Xi; Zhang Jingdi; Yao Wang; Liu Junwei; Wang Ning

doi:10.1360/nso/20220033

National Science Open (Jan 2023)

Unconventional ferroelectricity in half-filling states of antiparallel stacking of twisted WSe<sub>2</sub>

An Liheng,
Zhou Zishu,
Feng Xuemeng,
Huang Meizhen,
Cai Xiangbin,
Chen Yong,
Zhao Pei,
Dai Xi,
Zhang Jingdi,
Yao Wang,
Liu Junwei,
Wang Ning

Affiliations

An Liheng: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]
Zhou Zishu: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]
Feng Xuemeng: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]
Huang Meizhen: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]
Cai Xiangbin: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]
Chen Yong: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]
Zhao Pei: ["Department of Physics, University of Hong Kong, Hong Kong, China"]
Dai Xi: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China"]
Zhang Jingdi: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China"]
Yao Wang: ["Department of Physics, University of Hong Kong, Hong Kong, China"]
Liu Junwei: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China"]
Wang Ning: ["Department of Physics and Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China","William Mong Institute of Nano Science and Technology, the Hong Kong University of Science and Technology, Hong Kong, China"]

DOI: https://doi.org/10.1360/nso/20220033
Journal volume & issue: Vol. 2

Abstract

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We report on emergence of an abnormal electronic polarization in twisted double bilayer WSe2 in antiparallel interface stacking geometry, where local centrosymmetry of atomic registries at the twist interface does not favor the spontaneous electronic polarizations as recently observed in the parallel interface stacking geometry. The unconventional ferroelectric behaviors probed by electronic transport measurement occur at half filling insulating states at 1.5 K and gradually disappear at about 40 K. Single band Hubbard model based on the triangular moiré lattice and the interlayer charge transfer controlled by insulating phase transition are proposed to interpret the formation of electronic polarization states near half filling in twisted WSe2 devices. Our work highlights the prominent role of many-body electronic interaction in fostering novel quantum states in moiré-structured systems.

Published in National Science Open

ISSN: 2097-1168 (Print); 2097-1400 (Online)
Publisher: Science Press
Country of publisher: China
LCC subjects: Science; Technology: Engineering (General). Civil engineering (General)
Website: https://www.sciengine.com/NSO/home

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