Quantum stochastic resonance in parity violating chiral molecules

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In order to explore parity violating effects in chiral molecules, of interest in some models of evolution towards homochirality, quantum stochastic resonance (QSR) is studied for the population difference between the two enantiomers of a chiral molecule (hence for the optical activity of the sample), under low viscous friction and in the deep quantum regime. The molecule is described by a two-state model in an asymmetric double well potential where the asymmetry is given by the known predicted parity violating energy difference (PVED) between enantiomers. In the linear response to an external driving field that lowers and rises alternatively each one of the minima of the well, a signal of QSR is predicted only in the case that the PVED is different from zero, the resonance condition being independent on tunneling between the two enantiomers. It is shown that, at resonance, the fluctuations of the first order contribution to the internal energy are zero. Due to the small value of the PVED, the resonance would occur in the ultracold regime. Some proposals concerning the external driving field are suggested.
This journal is © the Owner Societies 2011. This work has been funded by the MEC (Spain) under projects CTQ2008-02578/BQU, FIS2007-62006 and FIS2007-65382, and supported by the grant BES-2006-11976 (P. B.). P. B. dedicates this work to Anais Dorta-Urra for her continuous support.
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