Honeycomb-Lattice Mott Insulator on Tantalum Disulphide
Abstract
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 5$$\textit{d}$$ electrons. Iin this work, we engineer a well-known triangular lattice 2D Mott insulator 1$$\textit{T}$$ – TaS2 into a honeycomb lattice utilizing an adsorbate superstructure. Potassium (K) adatoms at an optimum coverage deplete one-third of the unpaired $$\textit{d}$$ 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.
- Authors:
-
[1];
[2];
[8];
[1]
- Institute for Basic Science (IBS), Pohang (Republic of Korea); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
- Institute for Basic Science (IBS), Pohang (Republic of Korea); Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Toronto, ON (Canada)
- Institute for Basic Science (IBS), Daejeon (Republic of Korea)
- Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); Rutgers Univ., Piscataway, NJ (United States)
- Institute for Basic Science (IBS), Pohang (Republic of Korea)
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Toronto, ON (Canada); Canadian Institute for Advanced Research (CIFAR), Toronto, ON (Candad)
- Publication Date:
- Research Org.:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC)
- OSTI Identifier:
- 1800201
- Grant/Contract Number:
- FG02-04ER46148; IBS-R014-D1; IBS-R014-Y1; IBS-R024-D1; 06089-2016
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 125; Journal Issue: 9; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Physics
Citation Formats
Lee, Jinwon, Jin, Kyung-Hwan, Catuneanu, Andrei, Go, Ara, Jung, Jiwon, Won, Choongjae, Cheong, Sang-Wook, Kim, Jaeyoung, Liu, Feng, Kee, Hae-Young, and Yeom, Han Woong. Honeycomb-Lattice Mott Insulator on Tantalum Disulphide. United States: N. p., 2020.
Web. doi:10.1103/physrevlett.125.096403.
Lee, Jinwon, Jin, Kyung-Hwan, Catuneanu, Andrei, Go, Ara, Jung, Jiwon, Won, Choongjae, Cheong, Sang-Wook, Kim, Jaeyoung, Liu, Feng, Kee, Hae-Young, & Yeom, Han Woong. Honeycomb-Lattice Mott Insulator on Tantalum Disulphide. United States. https://doi.org/10.1103/physrevlett.125.096403
Lee, Jinwon, Jin, Kyung-Hwan, Catuneanu, Andrei, Go, Ara, Jung, Jiwon, Won, Choongjae, Cheong, Sang-Wook, Kim, Jaeyoung, Liu, Feng, Kee, Hae-Young, and Yeom, Han Woong. Fri .
"Honeycomb-Lattice Mott Insulator on Tantalum Disulphide". United States. https://doi.org/10.1103/physrevlett.125.096403. https://www.osti.gov/servlets/purl/1800201.
@article{osti_1800201,
title = {Honeycomb-Lattice Mott Insulator on Tantalum Disulphide},
author = {Lee, Jinwon and Jin, Kyung-Hwan and Catuneanu, Andrei and Go, Ara and Jung, Jiwon and Won, Choongjae and Cheong, Sang-Wook and Kim, Jaeyoung and Liu, Feng and Kee, Hae-Young and Yeom, Han Woong},
abstractNote = {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 5$\textit{d}$ electrons. Iin this work, we engineer a well-known triangular lattice 2D Mott insulator 1$\textit{T}$ – TaS2 into a honeycomb lattice utilizing an adsorbate superstructure. Potassium (K) adatoms at an optimum coverage deplete one-third of the unpaired $\textit{d}$ 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.},
doi = {10.1103/physrevlett.125.096403},
journal = {Physical Review Letters},
number = 9,
volume = 125,
place = {United States},
year = {Fri Aug 28 00:00:00 EDT 2020},
month = {Fri Aug 28 00:00:00 EDT 2020}
}
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