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Generalized SSH model with staggered field
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DOI：10.1088/2516-1075/ae22af.png)
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Abstract
En 中文
The ground state phase diagram of a generalized one-dimensional Su-Schrieffer-Heeger model is studied. The model takes into account staggered hoppings along the chain between the nearest-neighbor and next-nearest neighbor lattice sites as well as a staggered field. The phase diagram includes a topological phase with two zero energy localized edge modes and a non-trivial phase (NTP). In the NTP localized edge modes with different energies are realized. The Zak number nu(u) is a function of the staggered field amplitude u. The staggered field splits the zero energy edge modes, and the invariant becomes nu=12[nu(u)+nu(-u)]. In the staggered field, the phase transition between the NTP and the trivial phase (in which the edge modes are absent) occurs without gap closing, but the nu-invariant changes abruptly.
Keywords:
Zak number
topological phase
localized edge mode
Journal
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2.4
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63
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566