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Bulk-boundary correspondence for disordered free-fermion topological phases Max, Christopher
Description
Guided by the many-particle quantum theory of interacting systems, we develop a uniform classification scheme for topological phases of disordered gapped free fermions, encompassing all symmetry classes of the Tenfold Way. We apply this scheme to give a mathematically rigorous proof of bulk-boundary correspondence. To that end, we construct real C$^\ast$-algebras harbouring the bulk and boundary data of disordered free-fermion ground states. These we connect by a natural bulk-to-boundary short exact sequence, realising the bulk system as a quotient of the half-space theory modulo boundary contributions. To every ground state, we attach two classes in different pictures of real operator $K$-theory (or $KR$-theory): a bulk class, using Van Daele's picture, along with a boundary class in Kasparov's Fredholm picture. We then show that the connecting map for the bulk-to-boundary sequence maps these $KR$-theory classes to each other.
Item Metadata
Title |
Bulk-boundary correspondence for disordered free-fermion topological phases
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2019-06-06T12:30
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Description |
Guided by the many-particle quantum theory of interacting systems, we
develop a uniform classification scheme for topological phases of
disordered gapped free fermions, encompassing all symmetry classes of
the Tenfold Way. We apply this scheme to give a mathematically rigorous
proof of bulk-boundary correspondence. To that end, we construct real
C$^\ast$-algebras harbouring the bulk and boundary data of disordered
free-fermion ground states. These we connect by a natural
bulk-to-boundary short exact sequence, realising the bulk system as a
quotient of the half-space theory modulo boundary contributions. To
every ground state, we attach two classes in different pictures of real
operator $K$-theory (or $KR$-theory): a bulk class, using Van
Daele's picture, along with a boundary class in Kasparov's Fredholm
picture. We then show that the connecting map for the bulk-to-boundary
sequence maps these $KR$-theory classes to each other.
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Extent |
52.0 minutes
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Subject | |
Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: University of Cologne
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Series | |
Date Available |
2019-12-04
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0386731
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International