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Accueil du site > Séminaires > Séminaires 2010 > Quantum criticality in impurity models : the case of C60 single molecule transistors.

mardi 16 février - 14H00

Quantum criticality in impurity models : the case of C60 single molecule transistors.

Lorenzo DE LEO (CPHT École Polytechnique)

par Pierre Pujol - 16 février 2010

he recent advances of nanotechnology allow nowadays the fabrication of devices that can access new fundamental questions in condensed matter. One important example is the study of quantum criticality. The realization of multi-dot or multi-orbital geometries allows for the competition that is necessary to produce quantum critical points. In a recent experiment (Nature 453, 633 (2008)) a C60 single molecule transistor was realized by contacting a C60 molecule between two leads. By changing the gate voltage the system was then driven across a transition, that was characterized as a singlet-triplet transition. I will review the relevant physics of fullerene and propose an explanation of this experiment in terms of an interacting quantum critical point. This critical point is the result of the competition among the quantum many-body states of the systems, rather than among the molecular configurations.