TY - JOUR
T1 - Strong coupling expansion in a correlated three-dimensional topological insulator
AU - Sekine, Akihiko
AU - Nakano, Takashi Z.
AU - Araki, Yasufumi
AU - Nomura, Kentaro
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/4/30
Y1 - 2013/4/30
N2 - Motivated by recent studies which show that topological phases may emerge in strongly correlated electron systems, we theoretically study the strong electron correlation effect in a three-dimensional topological insulator, where the effective Hamiltonian can be described by the Wilson fermions. We adopt a 1/r long-range Coulomb interaction as the interaction between the bulk electrons. Based on the U(1) lattice gauge theory, the strong coupling expansion is applied by assuming that the effective interaction is strong. It is shown that the effect of the Coulomb interaction is equivalent to the renormalization of the bare mass of the Wilson fermions and, as a result, the topological insulator phase survives in the strong coupling limit.
AB - Motivated by recent studies which show that topological phases may emerge in strongly correlated electron systems, we theoretically study the strong electron correlation effect in a three-dimensional topological insulator, where the effective Hamiltonian can be described by the Wilson fermions. We adopt a 1/r long-range Coulomb interaction as the interaction between the bulk electrons. Based on the U(1) lattice gauge theory, the strong coupling expansion is applied by assuming that the effective interaction is strong. It is shown that the effect of the Coulomb interaction is equivalent to the renormalization of the bare mass of the Wilson fermions and, as a result, the topological insulator phase survives in the strong coupling limit.
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U2 - 10.1103/PhysRevB.87.165142
DO - 10.1103/PhysRevB.87.165142
M3 - Article
AN - SCOPUS:84877028171
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 16
M1 - 165142
ER -