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Title: Model of chiral spin liquids with Abelian and non-Abelian topological phases

Journal Article · · Physical Review B
 [1];  [1];  [2];  [3]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Condensed Matter Theory Group
  2. Boston Univ., MA (United States). Dept. of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Division

In this article, we present a two-dimensional lattice model for quantum spin-1/2 for which the low-energy limit is governed by four flavors of strongly interacting Majorana fermions. We study this low-energy effective theory using two alternative approaches. The first consists of a mean-field approximation. The second consists of a random phase approximation (RPA) for the single-particle Green's functions of the Majorana fermions built from their exact forms in a certain one-dimensional limit. The resulting phase diagram consists of two competing chiral phases, one with Abelian and the other with non-Abelian topological order, separated by a continuous phase transition. Remarkably, the Majorana fermions propagate in the two-dimensional bulk, as in the Kitaev model for a spin liquid on the honeycomb lattice. We identify the vison fields, which are mobile (they are static in the Kitaev model) domain walls propagating along only one of the two space directions.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNSF); Boston Univ., MA (United States)
Grant/Contract Number:
SC0012704; 2000021 153648; FG02-06ER46316; AC02-98CH10886
OSTI ID:
1425001
Alternate ID(s):
OSTI ID: 1413563; OSTI ID: 1425000
Report Number(s):
BNL-114843-2017-JAAM; BNL-114836-2017-JAAM; PRBMDO; TRN: US1801993
Journal Information:
Physical Review B, Vol. 96, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (7)

Exact solution of an integrable anisotropic $\boldsymbol{J_1-J_2}$ spin chain model journal January 2020
Model of spin liquids with and without time-reversal symmetry journal May 2019
From coupled wires to coupled layers: Model with three-dimensional fractional excitations journal June 2019
Coupled-wire constructions: a Luttinger liquid approach to topology journal February 2020
Ground-state degeneracy of non-Abelian topological phases from coupled wires text January 2019
Model of spin liquids with and without time-reversal symmetry text January 2018
Coupled-wire constructions: a Luttinger liquid approach to topology text January 2019

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