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Manifestation of axion electrodynamics through magnetic ordering on edges of a topological insulator

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Title
Manifestation of axion electrodynamics through magnetic ordering on edges of a topological insulator
Author(s)
Lee, Y.-L.; Hee Chul Park; Ihm, J.; Son, Y.-W.
Publication Date
2015-09
Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.112, no.37, pp.11514 - 11518
Publisher
NATL ACAD SCIENCES
Abstract
Because topological surface states of a single-crystal topological insulator can exist on all surfaces with different crystal orientations enclosing the crystal, mutual interactions among those states contiguous to each other through edges can lead to unique phenomena inconceivable in normal insulators. Here we show, based on a first-principles approach, that the difference in the work function between adjacent surfaces with different crystal-face orientations generates a built-in electric field around facet edges of a prototypical topological insulator such as Bi2Se3. Owing to the topological magnetoelectric coupling for a given broken time-reversal symmetry in the crystal, the electric field, in turn, forces effective magnetic dipoles to accumulate along the edges, realizing the facet-edge magnetic ordering. We demonstrate that the predicted magnetic ordering is in fact a manifestation of the axion electrodynamics in real solids
URI
https://pr.ibs.re.kr/handle/8788114/1904
ISSN
0027-8424
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
Files in This Item:
PNAS-2015-Lee-11514-8.pdfDownload

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