INVESTIGADORES
CALVO Hernan Laureano
congresos y reuniones científicas
Título:
(Poster) Interaction-induced charge and spin pumping through a quantum dot at finite bias
Autor/es:
HERNAN L. CALVO; LAURA CLASSEN; JANINE SPLETTSTOESSER; MAARTEN R. WEGEWIJS
Lugar:
Bremen
Reunión:
Workshop; CECAM Workshop "Molecular electronics: Quo vadis?"; 2013
Institución organizadora:
Deutsche Forschungsgemeinshaft
Resumen:
We
discuss charge and spin transport through an adiabatically driven,
strongly interacting quantum dot weakly coupled to two metallic
contacts with finite bias voltage. We identify coefficients of response
to the time-dependent external driving and relate these to the concept
of emissivity. These coefficients allow for a straightforward analysis
of the predicted interaction-induced pumping under periodic modulation
of the gate and bias voltage. We extend this adiabatic Coulomb
blockade spectroscopy to spin pumping. In the absence of a magnetic
field, we show a striking, simple relation between the pumped charge at
zero bias and at bias equal to the Coulomb charging energy. At finite
magnetic field, we discuss the possibility to have interaction-induced
pure spin pumping. For large-amplitude driving, the magnitude of both
the pumped charge and spin saturates at values which are independent of
the specific shape of the pumping cycle. Each of these values provides
an independent, quantitative measurement of the junction asymmetry.