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RESEARCH PRODUCT
Quantum Creep and Quantum-Creep Transitions in 1D Sine-Gordon Chains
Martin H. MüserFlorian R. Krajewskisubject
PhysicsCondensed Matter - Materials ScienceStatistical Mechanics (cond-mat.stat-mech)Condensed matter physicsMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesGeneral Physics and AstronomyThermal fluctuations02 engineering and technologySubstrate (electronics)021001 nanoscience & nanotechnology01 natural sciencesMolecular dynamicsCreepChain (algebraic topology)Condensed Matter::Superconductivity0103 physical sciencesSine010306 general physics0210 nano-technologyQuantumCondensed Matter - Statistical MechanicsQuantum fluctuationdescription
Discrete sine-Gordon (SG) chains are studied with path-integral molecular dynamics. Chains commensurate with the substrate show the transition from collective quantum creep to pinning at bead masses slightly larger than those predicted from the continuous SG model. Within the creep regime, a field-driven transition from creep to complete depinning is identified. The effects of disorder in the external potential on the chain's dynamics depend on the potential's roughness exponent $H$, i.e., quantum and classical fluctuations affect the current self-correlation functions differently for $H = 1/2$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-05-02 | Physical Review Letters |