Phase-dependent topological interface state and spatial adiabatic passage in a generalized Su-Schrieffer-Heeger model

Year: 2019

Authors: Du L., Wu J.H., Artoni M., La Rocca GC.

Autors Affiliation: Northeast Normal Univ, Ctr Quantum Sci, Changchun 130117, Jilin, Peoples R China; Northeast Normal Univ, Sch Phys, Changchun 130117, Jilin, Peoples R China; Shanxi Univ, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Shanxi, Peoples R China; Brescia Univ, Dept Engn & Informat Technol, I-25133 Brescia, Italy; Brescia Univ, CNR, INO, I-25133 Brescia, Italy;] Scuola Normale Super Pisa, I-56126 Pisa, Italy; CNISM, I-56126 Pisa, Italy

Abstract: We extend the Su-Schrieffer-Heeger model to include both an additional real intercell coupling and a complex intracell coupling whose phase can be interpreted as the Peierls phase associated with a synthetic gauge field. Using different Peierls phases, we can realize a heterostructure supporting a topologically protected interface state, depending on the existence of one trivial and two nontrivial phases of distinct winding numbers. The spatial adiabatic passage of this localized state from the inner interface to either open boundary can be attained simply by modulating the corresponding Peierls phase, while its decay or growth rate is controlled by the on-site parity-time symmetric loss and gain terms. Our results provide a scheme to achieve dynamical control of topologically protected states while being of potential interest to topological lasers with an adjustable spatial profile.


Volume: 100 (1)      Pages from: 012112-1  to: 012112-9

DOI: 10.1103/PhysRevA.100.012112

Citations: 14
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