Dynamic hysteresis in microscopic systems with static and fluctuating barriers: the pattern of zero and non-zero temperature responses

Mondal, Chandan Kumar ; Bhattacharyya, S. P. (2001) Dynamic hysteresis in microscopic systems with static and fluctuating barriers: the pattern of zero and non-zero temperature responses Physics Letters A, 286 (2-3). pp. 167-174. ISSN 0375-9601

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03759...

Related URL: http://dx.doi.org/10.1016/S0375-9601(01)00396-6

Abstract

The zero temperature quantum dynamics of a periodically driven particle moving in a bi-stable potential with a static barrier height is shown to sustain hysteresis loops. If the barrier height fluctuates randomly the loop area shrinks and passes through a minimum at a critical frequency of fluctuation (ω0c). At non-zero temperatures, the loop area passes through a maximum at a critical fluctuation frequency (ωTc). The overall barrier crossing rates (by tunneling and overbarrier processes) display exactly similar responses. The loop area A reveals a clear maximum as a function of driving frequency (ωd) at zero temperature while for T>0, two maxima occur on the A-ω plot. The actual crossing rates also display similar resonance like responses to the driving field.

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