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Sergej Flach
복잡계 이론물리 연구단
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Interaction-induced connectivity of disordered two-particle states

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Title
Interaction-induced connectivity of disordered two-particle states
Author(s)
Krimer, DO; S. Flach
Publication Date
2015-03
Journal
PHYSICAL REVIEW B, v.91, no.10, pp.100201 -
Publisher
AMER PHYSICAL SOC
Abstract
We study the interaction-induced connectivity in the Fock space of two particles in a disordered onedimensional potential. Recent computational studies showed that the largest localization length xi(2) of two interacting particles in a weakly random tight-binding chain is increasing unexpectedly slow relative to the single-particle localization length xi(1), questioning previous scaling estimates. We show this to be a consequence of the approximate restoring of momentum conservation of weakly localized single-particle eigenstates, and disorder-induced phase shifts for partially overlapping states. The leading resonant links appear among states which share the same energy and momentum. We substantiate our analytical approach by computational studies for up to xi(1) = 1000. A potential nontrivial scaling regime sets in for xi(1) approximate to 400
URI
http://pr.ibs.re.kr/handle/8788114/1632
DOI
10.1103/PhysRevB.91.100201
ISSN
1098-0121
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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