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Quantum Phase Transition in Organic Charge-Transfer Complexes

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Science  10 Jan 2003:
Vol. 299, Issue 5604, pp. 229-232
DOI: 10.1126/science.1076129

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Abstract

A phase transition in an organic charge-transfer complex, which originates from the neutral-ionic valence instability, can be tuned toward zero kelvin with use of external pressure or chemical modification as a control parameter. The phase diagram and observed dielectric behaviors are typical of quantum paraelectricity, yet this zero-kelvin transition point namely, the quantum critical point, accompanies large quantum fluctuation of the molecular charge, as demonstrated by the molecular vibrational mode spectra. The result indicates that the π-electron transfer between donor and acceptor molecules is coupled with the zero-point lattice dynamics around the quantum critical point.

  • * To whom correspondence should be addressed. E-mail: s-horiuchi{at}aist.go.jp

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