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RESEARCH PRODUCT
Localization-delocalization transition for disordered cubic harmonic lattices.
Rudolf A. RömerWalter SchirmacherWalter SchirmacherSebastian D. PinskiTerry E. Whallsubject
PhysicsModels MolecularPhase transitionCondensed matter physicsMolecular ConformationFOS: Physical sciencesDisordered Systems and Neural Networks (cond-mat.dis-nn)Condensed Matter - Disordered Systems and Neural NetworksRenormalization groupCondensed Matter PhysicsCondensed Matter::Disordered Systems and Neural NetworksPhase TransitionUniversality (dynamical systems)Models ChemicalDensity of statesGeneral Materials ScienceComputer SimulationWave functionCritical exponentAnderson impurity modelPhase diagramdescription
We study numerically the disorder-induced localization-delocalization phase transitions that occur for mass and spring constant disorder in a three-dimensional cubic lattice with harmonic couplings. We show that, while the phase diagrams exhibit regions of stable and unstable waves, the universality of the transitions is the same for mass and spring constant disorder throughout all the phase boundaries. The combined value for the critical exponent of the localization lengths of $\nu = 1.550^{+0.020}_{-0.017}$ confirms the agreement with the universality class of the standard electronic Anderson model of localization. We further support our investigation with studies of the density of states, the participation numbers and wave function statistics.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-05-03 | Journal of physics. Condensed matter : an Institute of Physics journal |