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Paper detail

Topological Zero-Energy Modes in Gapless Commensurate Aubry-André-Harper Models

The Aubry-André or Harper (AAH) model has been the subject of extensive theoretical research in the context of quantum localization. Recently, it was shown that one-dimensional quasicrystals described by the incommensurate AAH model has a nontrivial topology. In this Letter, we show that the commensurate off-diagonal AAH model is topologically nontrivial in the gapless regime and supports zero-energy edge modes. Unlike the incommensurate case, the nontrivial topology in the off-diagonal AAH model is attributed to the topological properties of the one-dimensional Majorana chain. We discuss the feasibility of experimental observability of our predicted topological phase in the commensurate AAH model.

preprint2013arXivOpen access
Sriram GaneshanKai SunS. Das Sarma
cond-mat.mes-hallquant-ph
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Sriram GaneshanKai SunS. Das Sarma

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