ICTP Seminar Series in CMSP Thursday 14 April at 11:30: Andres KOMNIK

[Condensed Matter Section]

ICTP Seminar Series in Condensed Matter and Statistical Physics
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THURSDAY 14 April at 11:30 a.m.
Luigi Stasi Seminar Room, 1st floor, Leonardo Building


Andres KOMNIK
Institute for Theoretical Physics, Heidelberg University

"BISTABILITY AND KONDO EFFECT IN MOLECULAR QUANTUM DOTS:
NUMERICS vs ANALYTICAL RESULTS"


Abstract:

Electrically contacted molecules are considered to be the ultimate
current switches. Their typical dimensions of about 1 nm would allow to
design the smallest possible transistor units. However, contrary to
solid state circuitry their conductance properties can be decisively
influenced by the harmonic degrees of freedom (local phonons).
Surprisingly, there are parameter regimes, in which the presence of such
seemingly disturbing effects might in fact become an advantage making
such a device intrinsically bistable. We discuss these possibilities
using analytical as well as numerical techniques and make predictions
for the transport properties of contacted molecules in the relevant
regimes and make contact to such fundamental multi-particle phenomena as
Kondo effect.

References:

- J. Klatt, L. MÃhlbacher, and A. Komnik, Phys. Rev. B 91, 155306 (2015)
- K.F. Albrecht, H. Wang, L. MÃhlbacher, M. Thoss, and A. Komnik, Phys.
Rev. B 86, 081412(R) (2012)
- S. Maier, T. L. Schmidt, and A. Komnik, Phys. Rev. B 83, 085401 (2011)