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복잡계 이론물리 연구단
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Landau-Zener Bloch Oscillations with Perturbed Flat Bands

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Title
Landau-Zener Bloch Oscillations with Perturbed Flat Bands
Author(s)
Ramaz Khomeriki; Sergej Flach
Publication Date
2016-06
Journal
PHYSICAL REVIEW LETTERS, v.116, no.24, pp.245301 -
Publisher
AMER PHYSICAL SOC
Abstract
Sinusoidal Bloch oscillations appear in band structures exposed to external fields. Landau-Zener (LZ) tunneling between different bands is usually a counteracting effect limiting Bloch oscillations. Here we consider a flat band network with two dispersive and one flat band, e.g., for ultracold atoms and optical waveguide networks. Using external synthetic gauge and gravitational fields we obtain a perturbed yet gapless band structure with almost flat parts. The resulting Bloch oscillations consist of two parts—a fast scan through the nonflat part of the dispersion structure, and an almost complete halt for substantial time when the atomic or photonic wave packet is trapped in the original flat band part of the unperturbed spectrum, made possible due to LZ tunneling. © 2016 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/2526
DOI
10.1103/PhysRevLett.116.245301
ISSN
0031-9007
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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