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원자제어 저차원 전자계 연구단
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Honeycomb-Lattice Mott Insulator on Tantalum Disulphide

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Title
Honeycomb-Lattice Mott Insulator on Tantalum Disulphide
Author(s)
Jinwon Lee; Kyung-Hwan Jin; Andrei Catuneanu; Ara Go; Jiwon Jung; Choongjae Won; Sang-Wook Cheong; Jaeyoung Kim; Feng Liu; Hae-Young Kee; Han Woong Yeom
Subject
CHARGE-DENSITY WAVES, ; SCANNING TUNNELING SPECTROSCOPY, ; TRANSITION, ; SUPERCONDUCTIVITY, ; FERMIONS, ; 1T-TAS2, ; PHASE
Publication Date
2020-08
Journal
PHYSICAL REVIEW LETTERS, v.125, no.9, pp.096403
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. Effects of electron many-body interactions amplify in an electronic system with a narrow bandwidth opening a way to exotic physics. A narrow band in a two-dimensional (2D) honeycomb lattice is particularly intriguing as combined with Dirac bands and topological properties but the material realization of a strongly interacting honeycomb lattice described by the Kane-Mele-Hubbard model has not been identified. Here we report a novel approach to realize a 2D honeycomb-lattice narrow-band system with strongly interacting 5d electrons. We engineer a well-known triangular lattice 2D Mott insulator 1T-TaS2 into a honeycomb lattice utilizing an adsorbate superstructure. Potassium (K) adatoms at an optimum coverage deplete one-third of the unpaired d electrons and the remaining electrons form a honeycomb lattice with a very small hopping. Ab initio calculations show extremely narrow Z(2) topological bands mimicking the Kane-Mele model. Electron spectroscopy detects an order of magnitude bigger charge gap confirming the substantial electron correlation as confirmed by dynamical mean field theory. It could be the first artificial Mott insulator with a finite spin Chern number
URI
https://pr.ibs.re.kr/handle/8788114/7695
DOI
10.1103/PhysRevLett.125.096403
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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