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Interaction-Driven Spontaneous Quantum Hall Effect on a Kagome Lattice

Title: Interaction-driven Spontaneous Quantum Hall Effect On A Kagome Lattice.
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Name(s): Zhu, W., author
Gong, Shou-Shu, author
Zeng, Tian-Sheng, author
Fu, Liang, author
Sheng, D. N., author
Type of Resource: text
Genre: Text
Date Issued: 2016-08-23
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Topological states of matter have been widely studied as being driven by an external magnetic field, intrinsic spin-orbital coupling, or magnetic doping. Here, we unveil an interaction-driven spontaneous quantum Hall effect (a Chern insulator) emerging in an extended fermion-Hubbard model on a kagome lattice, based on a state-of-the-art density-matrix renormalization group on cylinder geometry and an exact diagonalization in torus geometry. We first demonstrate that the proposed model exhibits an incompressible liquid phase with doublet degenerate ground states as time-reversal partners. The explicit spontaneous time-reversal symmetry breaking is determined by emergent uniform circulating loop currents between nearest neighbors. Importantly, the fingerprint topological nature of the ground state is characterized by quantized Hall conductance. Thus, we identify the liquid phase as a quantum Hall phase, which provides a "proof-of-principle" demonstration of the interaction-driven topological phase in a topologically trivial noninteracting band.
Identifier: FSU_libsubv1_wos_000382007600009 (IID), 10.1103/PhysRevLett.117.096402 (DOI)
Keywords: landau-levels, model, realization, states, topological insulators
Publication Note: The publisher’s version of record is available at https://doi.org/10.1103/PhysRevLett.117.096402
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000382007600009
Owner Institution: FSU
Is Part Of: Physical Review Letters.
0031-9007
Issue: iss. 9, vol. 117

Choose the citation style.
Zhu, W., Gong, S. -S., Zeng, T. -S., Fu, L., & Sheng, D. N. (2016). Interaction-driven Spontaneous Quantum Hall Effect On A Kagome Lattice. Physical Review Letters. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000382007600009