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Paper   IPM / Biological Sciences / 14669
School of Biological Sciences
  Title:   Perturbative treatment of quantum to classical transition in chiral molecules: dilute phase versus condensed phase
1.  Farhad Taher Ghahramani
2.  Arash Tirandaz
  Status:   Published
  Journal: Journal of Physics B: Atomic, Molecular and Optical Physics
  No.:  2
  Vol.:  50
  Year:  2017
  Supported by:  IPM
We examine the dynamics of the chiral states of chiral molecules with high tunneling rates in dilute and condensed phases in the context of time-dependent perturbation theory. The chiral molecule is effectively described by an asymmetric double-well potential, whose asymmetry is a measure of chiral interactions. The dilute and condensed phases are conjointly described by a collection of harmonic oscillators but with temperature-dependent sub-ohmic and temperature-independent ohmic spectral densities, respectively. We examine our method quantitatively by applying the dynamics to an isotopic ammonia molecule, NHDT, in an inert background gas (as the dilute phase) and in water (as the condensed phase). As the different spectral densities imply, the extension of the dynamics from the dilute phase to the condensed phase is not trivial. While the dynamics in the dilute phase leads to racemization, the chiral interactions in the condensed phase induce the quantum Zeno effect. Moreover, contrary to the condensed phase, the short-time dynamics in the dilute phase is sensitive to the initial state of the chiral molecule and to the strength of the coupling between the molecule and the environment.

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