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Title: Interaction-Driven Spontaneous Quantum Hall Effect on a Kagome Lattice

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [1]
  1. California State Univ. Northridge (CSUN), Northridge, CA (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Topological states of matter have been widely studied as being driven by an external magnetic field, intrinsic spin-orbital coupling, or magnetic doping. With this work, 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. Moreover, the fingerprint topological nature of the ground state is characterized by quantized Hall conductance. Hence, 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.

Research Organization:
California State Univ. Northridge (CSUN), Northridge, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-06ER46305
OSTI ID:
1505728
Alternate ID(s):
OSTI ID: 1328624
Journal Information:
Physical Review Letters, Vol. 117, Issue 9; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (14)

Tuning topological phase and quantum anomalous Hall effect by interaction in quadratic band touching systems journal September 2018
Giant and anisotropic many-body spin–orbit tunability in a strongly correlated kagome magnet journal September 2018
Phase diagram of interacting spinless fermions on the honeycomb lattice journal November 2016
Interacting topological insulators: a review journal October 2018
Measuring an interaction-induced topological phase transition via the single-particle density matrix journal January 2020
Chiral spin liquid with spinon Fermi surfaces in the spin- 1 2 triangular Heisenberg model journal December 2019
Large-gap quantum anomalous Hall phase in hexagonal organometallic frameworks journal December 2018
Quantum critical behavior of two-dimensional Fermi systems with quadratic band touching journal December 2018
Symmetry-breaking topological insulators in the Z 2 Bose-Hubbard model journal January 2019
Phase diagram of interacting spinless fermions on the honeycomb lattice text January 2016
Interacting topological insulators: a review text January 2018
Tunning topological phase and quantum anomalous Hall effect by interaction in quadratic band touching systems text January 2018
Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet text January 2018
Large Band Gap Quantum Anomalous Hall Phase in Hexagonal Organometallic Frameworks text January 2018

Figures / Tables (4)


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