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Type: Artigo de periódico
Title: Dynamics of lattice-pinned charge stripes
Author: Dimashko, YA
Smith, CM
Hasselmann, N
Caldeira, AO
Abstract: We study the transversal dynamics of a charged stripe (quantum string), and show that zero-temperature quantum fluctuations are able to depin it from the lattice. If the hopping amplitude t is much smaller than the string tension J, the string is pinned by the underlying lattice. At t much greater than J, the string is depinned and allowed to move freely, if we neglect the effect of impurities. By mapping the system onto a one-dimensional array of Josephson junctions, we show that the quantum depinning occurs at (t/J)(c)= 2/pi(2). In addition, we exploit the relation of the stripe Hamiltonian to the sine-Gordon theory, and calculate the infrared excitation spectrum of the quantum string for arbitrary t/J values. [S0163-1829(99)00325-2].
Country: EUA
Editor: American Physical Soc
Citation: Physical Review B. American Physical Soc, v. 60, n. 1, n. 88, n. 91, 1999.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.60.88
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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