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복잡계 이론물리 연구단
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Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching

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Title
Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching
Author(s)
Shiqiang Xia; Carlo Danieli; Wenchao Yan; Denghui Li; Shiqi Xia; Jina Ma; Hai Lu; Daohong Song; Liqin Tang; Sergej Flach; Zhigang Chen
Publication Date
2020-01
Journal
APL PHOTONICS, v.5, no., pp.016107 -
Publisher
AMER INST PHYSICS
Abstract
We demonstrate experimentally the existence of compact localized states (CLSs) in a quasi-one-dimensional photonic rhombic lattice in the presence of two distinct refractive-index gradients (i.e., a driven lattice ribbon) acting as external electric fields. Such a lattice is composed of an array of periodically arranged evanescently coupled waveguides, which hosts a perfect flatband that touches both remaining dispersive bands when it is not driven. The external driving is realized by modulating the relative writing beam intensity of adjacent waveguides. We find that a y-gradient set perpendicularly to the ribbon preserves the flatband while removing the band-touching. The undriven dipole-like CLS— which occupies two lattice sites over one unit cell—turns into a quincunx-shaped CLS spanned over two unit cells. Instead, an x-gradient acting parallel to the ribbon yields a Stark ladder of the CLS whose spatial profile is unchanged with respect to the undriven case. We notably find that their superposition leads to Bloch-like oscillations in momentum space. © Author(s) 2020
URI
https://pr.ibs.re.kr/handle/8788114/7017
ISSN
2378-0967
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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