The Wigner formalism is a convenient reformulation of the Schrödinger equation that allows the simulation of transient behavior of quantum systems in the presence of general boundary conditions. Recently, a Wigner Monte Carlo technique, based on particles signs, has been generalized to two-dimensional evolution problems. In this paper, we apply this technique to study the time reversibility of the quantum evolution of a wave packet colliding with a potential wall in the presence of interface roughness, elastic, inelastic, and diffusive interactions with the environment. We show that a wall surface roughness does not necessarily involve time irreversibility. The dynamics of the packet is indeed influenced, but remains coherent, until the boundaries of the system begin to absorb information from the system. Finally, it is shown that in the presence of inelastic scattering or diffusive processes, the time-reversibility of a quantum system is destroyed, whatever the shape of the wall interface is. In particular, we show that the random nature of a process, elastic or inelastic, is responsible for the appearance of quantum decoherence.
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7 November 2013
Research Article|
November 01 2013
Decoherence and time reversibility: The role of randomness at interfaces
J. M. Sellier;
J. M. Sellier
1
IICT, Bulgarian Academy of Sciences
, Acad. G. Bontchev Str. Bl25A, 1113 Sofia, Bulgaria
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M. Nedjalkov;
M. Nedjalkov
2
Institute for Microelectronics
, TU Wien, Gußhausstraße 27–29/E360, 1040 Wien, Austria
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I. Dimov;
I. Dimov
1
IICT, Bulgarian Academy of Sciences
, Acad. G. Bontchev Str. Bl25A, 1113 Sofia, Bulgaria
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S. Selberherr
S. Selberherr
2
Institute for Microelectronics
, TU Wien, Gußhausstraße 27–29/E360, 1040 Wien, Austria
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J. Appl. Phys. 114, 174902 (2013)
Article history
Received:
September 23 2013
Accepted:
October 18 2013
Citation
J. M. Sellier, M. Nedjalkov, I. Dimov, S. Selberherr; Decoherence and time reversibility: The role of randomness at interfaces. J. Appl. Phys. 7 November 2013; 114 (17): 174902. https://doi.org/10.1063/1.4828736
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