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Title: Prediction of large gap flat Chern band in a two-dimensional metal-organic framework

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5017956· OSTI ID:1510949
 [1]; ORCiD logo [1];  [2];  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Materials Science and Engineering
  2. Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale

Systems with a flat Chern band have been extensively studied for their potential to realize high-temperature fractional quantum Hall states. To experimentally observe the quantum transport properties, a sizable topological gap is highly necessary. Taking advantage of the high tunability of two-dimensional (2D) metal-organic frameworks (MOFs), whose crystal structures can be easily tuned using different metal atoms and molecular ligands, we propose a design of a 2D MOF [Tl2(C6H4)3, Tl2Ph3] showing nontrivial topological states with an extremely large gap in both the nearly flat Chern band and the Dirac bands. By coordinating π-conjugated thallium ions and benzene rings, crystalline Tl2Ph3 can be formed with Tl and Ph constructing honeycomb and kagome lattices, respectively. The px,y orbitals of Tl on the honeycomb lattice form ideal pxy four-bands, through which a flat Chern band with a spin-orbit coupling (SOC) gap around 140 meV evolves below the Fermi level. This is the largest SOC gap among all the theoretically proposed organic topological insulators so far.

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-04ER46148; DMR-1121252
OSTI ID:
1510949
Alternate ID(s):
OSTI ID: 1417421
Journal Information:
Applied Physics Letters, Vol. 112, Issue 3; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Cited By (8)

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Prediction of two-dimensional organic topological insulator in metal-DCB lattices journal December 2018
Staggered potential and magnetic field tunable electronic switch in a kagome nanoribbon junction journal May 2019
Nonlinear optical response of the α T 3 model due to the nontrivial topology of the band dispersion journal July 2019
Hidden mechanism for embedding the flat bands of Lieb, kagome, and checkerboard lattices in other structures journal July 2019
Flat bands and nontrivial topological properties in an extended Lieb lattice journal December 2019
Enhanced magneto-optical response due to the flat band in nanoribbons made from the α T 3 lattice journal January 2019
Methods for the construction of interacting many-body Hamiltonians with compact localized states in geometrically frustrated clusters journal March 2020

Figures / Tables (5)