Excited quantum anomalous and spin Hall effect: dissociation of flat-bands-enabled excitonic insulator state

Zhou, Yinong; Sethi, Gurjyot; Liu, Hang; Wang, Zhengfei; Liu, Feng

doi:10.1088/1361-6528/ac7a4b

Title: Excited quantum anomalous and spin Hall effect: dissociation of flat-bands-enabled excitonic insulator state

Journal Article · Tue Jul 19 00:00:00 EDT 2022 · Nanotechnology

DOI:https://doi.org/10.1088/1361-6528/ac7a4b· OSTI ID:1905824

^[1]; Sethi, Gurjyot ^[1];

^[2];

^[3];

^[1]

Univ. of Utah, Salt Lake City, UT (United States)
Songshan Lake Materials Laboratory, Guangdong (China); Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Science and Technology of China, Hefei (China)

Quantum anomalous Hall effect (QAHE) and quantum spin Hall effect (QSHE) are two interesting physical manifestations of 2D materials that have an intrinsic nontrivial band topology. In principle, they are ground-state equilibrium properties characterized by Fermi level lying in a topological gap, below which all the occupied bands are summed to a non-zero topological invariant. In this work, we propose theoretical concepts and models of ‘excited’ QAHE (EQAHE) and EQSHE generated by dissociation of an excitonic insulator (EI) state with complete population inversion (CPI), a unique many-body ground state enabled by two yin-yang flat bands (FBs) of opposite chirality hosted in a diatomic Kagome lattice. The two FBs have a trivial gap in between, i.e. the system is a trivial insulator in the single-particle ground-state, but nontrivial gaps above and below, so that upon photoexcitation the quasi-Fermi levels of both electrons and holes will lie in a nontrivial gap achieved by the CPI-EI state, as demonstrated by exact diagonalization calculations. Then dissociation of singlet and triplet EI state will lead to EQAHE and EQSHE, respectively. Realizations of yin-yang FBs in real materials are also discussed.

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Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-04ER46148

OSTI ID:: 1905824

Journal Information:: Nanotechnology, Vol. 33, Issue 41; ISSN 0957-4484

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Excited quantum anomalous and spin Hall effect: dissociation of flat-bands-enabled excitonic insulator state

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