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

Jiang, Zeyu; Li, Yuanchang; Duan, Wenhui; Zhang, Shengbai

doi:10.1103/PhysRevLett.122.236402

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

Journal Article · Fri Jun 14 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.236402· OSTI ID:1594887

Jiang, Zeyu ^[1]; Li, Yuanchang ^[2]; Duan, Wenhui ^[1]; Zhang, Shengbai ^[3]

Tsinghua Univ., Beijing (China)
Beijing Inst. of Technology (China)
Rensselaer Polytechnic Inst., Troy, NY (United States)

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.

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Research Organization:: Rensselaer Polytechnic Inst., NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0002623; 51788104; 2016YFA0301001; 11674071; 11674188

OSTI ID:: 1594887

Alternate ID(s):: OSTI ID: 1546403

Journal Information:: Physical Review Letters, Vol. 122, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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