Friday, December 14, 2012

1212.3020 (John H. Miller, Jr. et al.)

Coherent quantum transport of charge density waves    [PDF]

John H. Miller, Jr., Asanga I. Wijesinghe
Recent experiments show oscillations of period h/2e in conductance vs. magnetic flux of charge density wave (CDW) rings above 77 K, thus revealing macroscopically observable quantum behavior. The time-correlated soliton tunneling model discussed here is based on coherent, Josephson-like tunneling of microscopic quantum solitons of charge 2e. The model interprets the CDW threshold electric field as a Coulomb blockade threshold for soliton pair creation and draws upon the theory of time-correlated single-electron tunneling to interpret CDW dynamics above threshold. As in Feynman's derivation of the Josephson effect, the picture treats the Schrodinger equation as an emergent classical equation to describe the time evolution of Josephson-coupled fluidic complex order parameters. Coupling of vector or time-varying scalar potentials to the order parameter phases enables h/2e quantum interference in CDW rings and also leads to interesting behavior of CDWs in response to oscillatory electric fields. The ability to vary both magnitudes and phases of the Josephson-coupled order parameters is crucial to any future applications in quantum computing.
View original: http://arxiv.org/abs/1212.3020

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