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arXiv · 1709.00130

Antiresonance induced by symmetry-broken contacts in quasi-one-dimensional lattices

Jung-Wan Ryu·Nojoon Myoung·Hee Chul Park
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Abstract

We report the effect of symmetry-broken contacts on quantum transport in quasi-one-dimensional lattices. In contrast to 1D chains, transport in quasi-one-dimensional lattices, which are made up of a finite number of 1D chain layers, is strongly influenced by contacts. Contact symmetry depends on whether the contacts maintain or break the parity symmetry between the layers. With balanced on-site potential, a flat band can be detected by asymmetric contacts, but not by symmetric contacts. In the case of asymmetric contacts with imbalanced on-site potential, transmission is suppressed at certain energies. We elucidate these energies of transmission suppression related to antiresonance using reduced lattice models and Feynman paths. These results provide a nondestructive measurement of flat band energy which it is difficult to detect.

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Jung-Wan Ryu, Nojoon Myoung, Hee Chul Park. 2017-09-01. Antiresonance induced by symmetry-broken contacts in quasi-one-dimensional lattices. https://doi.org/10.1103/physrevb.96.125421

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