6533b82dfe1ef96bd1291ccb

RESEARCH PRODUCT

Many-body quantum dynamics by adiabatic path-integral molecular dynamics: Disordered Frenkel Kontorova models

Florian R. KrajewskiFlorian R. KrajewskiMartin H. Müser

subject

PhysicsMolecular dynamicsCondensed matter physicsHardware and ArchitectureLuttinger liquidQuantum dynamicsQuantum mechanicsPath integral molecular dynamicsGeneral Physics and AstronomySecond moment of areaAdiabatic processRandom walkQuantum

description

The spectral density of quantum mechanical Frenkel Kontorova chains moving in disordered, external potentials is investigated by means of path-integral molecular dynamics. If the second moment of the embedding potential is well defined (roughness exponent ), there is one regime in which the chain is pinned (large masses of chain particles) and one in which it is unpinned (small ). If the embedding potential can be classified as a random walk on large length scales ( ), then the chain is always pinned irrespective of the value of . For , two phonon-like branches appear in the spectra.

yearjournalcountryeditionlanguage
2005-07-01Computer Physics Communications
https://doi.org/10.1016/j.cpc.2005.03.094