Berry-phase effects in transport through single Jahn-Teller molecules

Details Berry-phase effects in transport through single Jahn-Teller molecules Berry-phase effects in transport through single Jahn-Teller molecules

2007-02-21

arxiv.org/abs/cond-mat/0702489v2

Physical Review B 77, 075323 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

extended version

Scientific paper

10.1103/PhysRevB.77.075323

The vibrational modes of Jahn-Teller molecules are affected by a Berry phase that is associated with a conical intersection of the adiabatic potentials. We investigate theoretically how this Berry phase affects transport through a single $E \otimes e$ Jahn-Teller molecule when the tunneling electrons continually switch the molecule between a symmetric and a Jahn-Teller distorted charge state. We find that the Berry phase in conjunction with a spectral trapping mechanism leads to a current blockade even in regions outside the Coulomb blockade. The blockade is strongly asymmetric in the gate voltage and induces pronounced negative differential conductance.

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