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Title: Half-Excitonic Insulator: A Single-Spin Bose-Einstein Condensate

Abstract

First-principles calculations reveal an unusual electronic state (dubbed as half excitonic insulator) in monolayer 1T-MX2 (M = Co, Ni and X = Cl, Br). Its one spin channel has a many-body ground state due to excitonic instability, while the other is characterized by a conventional band insulator gap. This disparity arises from a competition between the band gap and exciton binding energy, which exhibits a spin-dependence due to different orbital occupations. Such a state can be identified by optical absorption measurements and angle-resolved photoemission spectroscopy. Finally, our theory not only provides new insights for the study of exciton condensation in magnetic materials but also suggests that strongly correlated materials could be fertile candidates for excitonic insulators.

Authors:
 [1];  [2];  [1];  [3]
  1. Tsinghua Univ., Beijing (China)
  2. Beijing Inst. of Technology (China)
  3. Rensselaer Polytechnic Inst., Troy, NY (United States)
Publication Date:
Research Org.:
Rensselaer Polytechnic Inst., NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1594887
Alternate Identifier(s):
OSTI ID: 1546403
Grant/Contract Number:  
SC0002623; 51788104; 2016YFA0301001; 11674071; 11674188
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; first-principles; electronic structure; exciton

Citation Formats

Jiang, Zeyu, Li, Yuanchang, Duan, Wenhui, and Zhang, Shengbai. Half-Excitonic Insulator: A Single-Spin Bose-Einstein Condensate. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.236402.
Jiang, Zeyu, Li, Yuanchang, Duan, Wenhui, & Zhang, Shengbai. Half-Excitonic Insulator: A Single-Spin Bose-Einstein Condensate. United States. doi:10.1103/PhysRevLett.122.236402.
Jiang, Zeyu, Li, Yuanchang, Duan, Wenhui, and Zhang, Shengbai. Fri . "Half-Excitonic Insulator: A Single-Spin Bose-Einstein Condensate". United States. doi:10.1103/PhysRevLett.122.236402.
@article{osti_1594887,
title = {Half-Excitonic Insulator: A Single-Spin Bose-Einstein Condensate},
author = {Jiang, Zeyu and Li, Yuanchang and Duan, Wenhui and Zhang, Shengbai},
abstractNote = {First-principles calculations reveal an unusual electronic state (dubbed as half excitonic insulator) in monolayer 1T-MX2 (M = Co, Ni and X = Cl, Br). Its one spin channel has a many-body ground state due to excitonic instability, while the other is characterized by a conventional band insulator gap. This disparity arises from a competition between the band gap and exciton binding energy, which exhibits a spin-dependence due to different orbital occupations. Such a state can be identified by optical absorption measurements and angle-resolved photoemission spectroscopy. Finally, our theory not only provides new insights for the study of exciton condensation in magnetic materials but also suggests that strongly correlated materials could be fertile candidates for excitonic insulators.},
doi = {10.1103/PhysRevLett.122.236402},
journal = {Physical Review Letters},
number = 23,
volume = 122,
place = {United States},
year = {2019},
month = {6}
}

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