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Two-component quantum Hall effects in topological flat bands.
- Source :
-
Physical Review B . Mar2017, Vol. 95 Issue 12, p1-1. 1p. - Publication Year :
- 2017
-
Abstract
- We study quantum Hall states for two-component particles (hardcore bosons and fermions) loading in topological lattice models. By tuning the interplay of interspecies and intraspecies interactions, we demonstrate that two-component fractional quantum Hall states emerge at certain fractional filling factors ν=1/2 for fermions (ν=2/3 for bosons) in the lowest Chern band, classified by features from ground states including the unique Chern number matrix (inverse of the K matrix), the fractional charge and spin pumpings, and two parallel propagating edge modes. Moreover, we also apply our strategy to two-component fermions at integer filling factor ν=2, where a possible topological Neel antiferromagnetic phase is under intense debate very recently. For the typical p-flux checkerboard lattice, by tuning the onsite Hubbard repulsion, we establish a first-order phase transition directly from a two-component fermionic ν=2 quantum Hall state at weak interaction to a topologically trivial antiferromagnetic insulator at strong interaction, and therefore exclude the possibility of an intermediate topological phase for our system. [ABSTRACT FROM AUTHOR]
- Subjects :
- *QUANTUM Hall effect
*ENERGY bands
*FERMIONS
Subjects
Details
- Language :
- English
- ISSN :
- 24699950
- Volume :
- 95
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Physical Review B
- Publication Type :
- Academic Journal
- Accession number :
- 122638167
- Full Text :
- https://doi.org/10.1103/PhysRevB.95.125134