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

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.
 [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
Publication Date:
Report Number(s):
BNL-114836-2017-JAAM; BNL-114843-2017-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
SC0012704; 2000021 153648; FG02-06ER46316; AC02-98CH10886
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 22; Journal ID: ISSN 2469-9950
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
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)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Quantum spin liquid; topological phases of matter; bosonization; conformal field theory; Green's function methods; Gross-Neveu model; Non-Abelian models; spin lattice models
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1413563; OSTI ID: 1425000