Artículos de revistas
Dynamics of lattice-pinned charge stripes
Registro en:
Physical Review B. American Physical Soc, v. 60, n. 1, n. 88, n. 91, 1999.
0163-1829
WOS:000081551100023
10.1103/PhysRevB.60.88
Autor
Dimashko, YA
Smith, CM
Hasselmann, N
Caldeira, AO
Institución
Resumen
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]. 60 1 88 91