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Correlation effects on 3D topological phases: From bulk to boundary

Title
Correlation effects on 3D topological phases: From bulk to boundary
Authors
Go A.Witczak-Krempa W.Jeon G.S.Park K.Kim Y.B.
Ewha Authors
전건상
SCOPUS Author ID
전건상scopus
Issue Date
2012
Journal Title
Physical Review Letters
ISSN
0031-9007JCR Link
Citation
vol. 109, no. 6
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Topological phases of quantum matter defy characterization by conventional order parameters but can exhibit a quantized electromagnetic response and/or protected surface states. We examine such phenomena in a model for three-dimensional correlated complex oxides, the pyrochlore iridates. The model realizes interacting topological insulators, with and without time-reversal symmetry, and topological Weyl semimetals. We use cellular dynamical mean-field theory, a method that incorporates quantum many-body effects and allows us to evaluate the magnetoelectric topological response coefficient in correlated systems. This invariant is used to unravel the presence of an interacting axion insulator absent within a simple mean-field study. We corroborate our bulk results by studying the evolution of the topological boundary states in the presence of interactions. Consequences for experiments and for the search for correlated materials with symmetry-protected topological order are given. © 2012 American Physical Society.
DOI
10.1103/PhysRevLett.109.066401
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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