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Title: High-temperature fractional quantum Hall state in the Floquet kagome flat band

Journal Article · · Physical Review. B
 [1]; ORCiD logo [2];  [3];  [2];  [4];  [5]; ORCiD logo [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Utah, Salt Lake City, UT (United States); Songshan Lake Materials Laboratory, Guangdong (China)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. California State University, Northridge (CSUN), CA (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China); Beijing Institute of Technology (China)
  5. Univ. of Utah, Salt Lake City, UT (United States); Songshan Lake Materials Laboratory, Guangdong (China)

A fractional quantum Hall effect (FQHE) has been predicted in a topological flat band (FB) by a single-particle band structure combined with phenomenological theory or solution of a many-body lattice Hamiltonian with fuzzy parameters. A long-standing roadblock toward the realization of a FB-FQHE is lacking the many-body solution of specific materials under realistic conditions. Here, we demonstrate a combined study of single-particle Floquet band theory with exact diagonalization (ED) of a many-body Hamiltonian. We show that a time-periodic circularly polarized laser inverts the sign of second-nearest-neighbor hopping in a kagome lattice and enhances spin-orbit coupling in one spin channel to produce a Floquet FB with a high flatness ratio of bandwidth over band gap, as exemplified in monolayer Pt3C36S12H12. The ED of the resultant Floquet-kagome lattice Hamiltonian gives a one-third-filling ground state with a laser-dependent excitation gap of a FQH state, up to an estimated temperature above 70 K. Our findings pave the way for exploring the alluding high-temperature FB-FQHE.

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Basic Research Program of China; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences; China Postdoctoral Science Foundation; Guangdong Basic and Applied Basic Research Foundation; China Scholarship Council
Grant/Contract Number:
FG02-04ER46148; FG02-06ER46305; 2020YFA0308800; 2016YFA0300902; 2015CB921001; 91850120; 11774396; 11974045; 12147136; XDB30000000; 2021M700163; 2021A1515110466
OSTI ID:
1905826
Journal Information:
Physical Review. B, Vol. 105, Issue 16; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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