Scaling analysis and instantons for thermally assisted tunneling and quantum Monte Carlo simulations
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DOI: 10.1103/physreva.95.012322
Abstract: We develop an instantonic calculus to derive an analytical expression for the thermally-assisted tunneling decay rate of a metastable state in a fully connected quantum spin model. The tunneling decay problem can be mapped onto… read more here.
Keywords: quantum; monte carlo; quantum monte; thermally assisted ... See more keywords
Exponential and power-law renormalization in phonon-assisted tunneling
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DOI: 10.1103/physrevb.96.195155
Abstract: We investigate the spinless Anderson-Holstein model routinely employed to describe the basic physics of phonon-assisted tunneling in molecular devices. Our focus is on small to intermediate electron-phonon coupling; we complement a recent strong coupling study… read more here.
Keywords: renormalization; phonon; phonon assisted; law renormalization ... See more keywords