Universität zu Köln

Genske, Maximilian and Rosch, Achim ORCID: 0000-0002-6586-5721 (2014). Directed motion of doublons and holes in periodically driven Mott insulators. Phys. Rev. A, 90 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1094-1622

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Abstract

Periodically driven systems can lead to a directed motion of particles. We investigate this ratchet effect for a bosonic Mott insulator where both a staggered hopping and a staggered local potential vary periodically in time. If driving frequencies are smaller than the interaction strength and the density of excitations is small, one obtains effectively a one-particle quantum ratchet describing the motion of doubly occupied sites (doublons) and empty sites (holes). Such a simple quantum machine can be used to manipulate the excitations of the Mott insulator. For suitably chosen parameters, for example, holes and doublons move in opposite directions. To investigate whether the periodic driving can be used to move particles uphill, i.e., against an external force, we study the influence of a linear potential -gx. For long times, transport is only possible when the driving frequency omega and the external force g are commensurate, n(0)g = m(0)omega, with n(0)/2, m(0) is an element of Z.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Genske, Maximilian UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-425449
DOI:	10.1103/PhysRevA.90.043637
Journal or Publication Title:	Phys. Rev. A
Volume:	90
Number:	4
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1094-1622
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUANTUM RATCHET; BROWNIAN MOTORS; NEUTRAL ATOMS; TRANSPORT; SYSTEMS Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42544