PT-breaking threshold in spatially asymmetric Aubry-André and Harper models: Hidden symmetry and topological states
Date
2016-06
Language
English
Embargo Lift Date
Department
Committee Members
Degree
Degree Year
Department
Grantor
Journal Title
Journal ISSN
Volume Title
Found At
APS
Abstract
Aubry-André-Harper lattice models, characterized by a reflection-asymmetric sinusoidally varying nearest-neighbor tunneling profile, are well known for their topological properties. We consider the fate of such models in the presence of balanced gain and loss potentials ±iγ located at reflection-symmetric sites. We predict that these models have a finite PT-breaking threshold only for specific locations of the gain-loss potential and uncover a hidden symmetry that is instrumental to the finite threshold strength. We also show that the topological edge states remain robust in the PT-symmetry-broken phase. Our predictions substantially broaden the possible experimental realizations of a PT-symmetric system.
Description
item.page.description.tableofcontents
item.page.relation.haspart
Cite As
Harter, A. K., Lee, T. E., & Joglekar, Y. N. (2016). PT-breaking threshold in spatially asymmetric Aubry-André and Harper models: Hidden symmetry and topological states. Physical Review A, 93(6), 062101.
ISSN
Publisher
Series/Report
Sponsorship
Major
Extent
Identifier
Relation
Journal
Physical Review A
Rights
Publisher Policy
Source
Publisher
Alternative Title
Type
Article
Number
Volume
Conference Dates
Conference Host
Conference Location
Conference Name
Conference Panel
Conference Secretariat Location
Permanent Link
Version
Final published version