Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevB.99.045441
Title: Coupled-wire construction of static and Floquet second-order topological insulators
Authors: Bomantara, Raditya Weda 
Zhou, Longwen 
Pan, Jiaxin
Gong, Jiangbin 
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
Issue Date: 29-Jan-2019
Publisher: AMER PHYSICAL SOC
Citation: Bomantara, Raditya Weda, Zhou, Longwen, Pan, Jiaxin, Gong, Jiangbin (2019-01-29). Coupled-wire construction of static and Floquet second-order topological insulators. PHYSICAL REVIEW B 99 (4). ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.99.045441
Abstract: © 2019 American Physical Society. Second-order topological insulators (SOTI) exhibit protected gapless boundary states at their hinges or corners. In this paper, we propose a generic means to construct SOTIs in static and Floquet systems by coupling one-dimensional topological insulator wires along a second dimension through dimerized hopping amplitudes. The Hamiltonian of such SOTIs admits a Kronecker sum structure, making it possible for obtaining its features by analyzing two constituent one-dimensional lattice Hamiltonians defined separately in two orthogonal dimensions. The resulting topological corner states do not rely on any delicate spatial symmetries, but are solely protected by the chiral symmetry of the system. We further utilize our idea to construct Floquet SOTIs, whose number of topological corner states is arbitrarily tunable via changing the hopping amplitudes of the system. Finally, we propose to detect the topological invariants of static and Floquet SOTIs constructed with our approach in experiments by measuring the mean chiral displacements of wavepackets.
Source Title: PHYSICAL REVIEW B
URI: https://scholarbank.nus.edu.sg/handle/10635/168534
ISSN: 2469-9950
2469-9969
DOI: 10.1103/PhysRevB.99.045441
Appears in Collections:Staff Publications
Elements

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Floquet_corner_states_v8.pdfAccepted version2.27 MBAdobe PDF

OPEN

Post-printView/Download

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.