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AC-Transport in Nanostructures

English title AC-Transport in Nanostructures
Applicant Belzig Wolfgang
Number 106368
Funding scheme SNSF Professorships
Research institution
Institution of higher education University of Basel - BS
Main discipline Theoretical Physics
Start/End 01.03.2005 - 31.08.2008
Approved amount 289'094.00
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All Disciplines (2)

Theoretical Physics
Condensed Matter Physics

Keywords (8)

Quantum transport; shot noise; molecular electronics; quantum coherence; high-frequency noise; mesoscopic superconductivity; Nanoelectronics; Mesoscopic Physics

Lay Summary (English)

Lay summary
Quantum properties of nanoscopic conductors can be probed bytime-dependent effects. We will explore theoretically, how quantumcorrelations influence the current and fluctuation spectra. For that weplan to develop novel methods to treat time-dependent transport throughinteracting nanostructures. This progress is relevant for several fieldsof quantum transport, in particular implementation of quantuminformation processing in nanoscale devices and molecular electronics.First, we will employ the recently developed extended Keldysh Green'sfunctions theory, one of the most powerful tools to study transport atthe nanoscale, and extend this method to time-dependent transport. In asecond step, we will apply this method to transport through interactingnanostructures, which will require to adapt advanced methods, e.~g. fromstrongly correlated electron physics, to the circuit method. An exampleare the theory of elastic cotunneling or the numerical renormalizationgroup method.In intensive collaboration with experimentalists we will investigatepossible routes to learn more about quantum coherent transport at thenanoscale and in electronic molecular devices. We will explore concreteimplementations of quantum detectors strongly coupled to mesoscopictransport structures. An example are nanomechanical devices made out ofsuspended carbon nanotubes, which are capacitively coupled to a gatewhich can be used to self-detect transport through the nanotube. Furtherdevices could be superconducting single electron transistors ormesoscopic superconducting structures. In molecular nanodevices we willexplore the interplay between ac-fields and transport through complexobjects. Vibrational degrees of freedom (phonons) play an important rolein transport through molecular structures and we will investigate theirinfluence on the transport properties in the presence of atime-dependent electric fields. The proposed project is highly relevantfor this field, since several experimental groups are currently pursuingthis approach to learn more about the transport mechanism on themolecular scale.
Direct link to Lay Summary Last update: 21.02.2013

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