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Non-Orthogonality a...
Non-Orthogonality and Electron Correlations in Nanotransport : Spin- and Time-Dependent Currents
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- Fransson, Jonas, 1970- (författare)
- Uppsala universitet,Fysiska institutionen
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- Jauho, Antti-Pekka, Prof. (opponent)
- Mikroelektroink Centret, Technical University of Denmark, Lyngby
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(creator_code:org_t)
- ISBN 9155454186
- Uppsala : Acta Universitatis Upsaliensis, 2002
- Engelska 101 s.
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Serie: Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X ; 756
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Abstract
Ämnesord
Stäng
- The concept of the transfer Hamiltonian formalism has been reconsidered and generalized to include the non-orthogonality between the electron states in an interacting region, e.g. quantum dot (QD), and the states in the conduction bands in the attached contacts. The electron correlations in the QD are described by means of a diagram technique for Hubbard operator Green functions for non-equilibrium states. It is shown that the non-orthogonality between the electrons states in the contacts and the QD is reflected in the anti-commutation relations for the field operators of the subsystems. The derived forumla for the current contains corrections from the overlap of the same order as the widely used conventional tunneling coefficients. It is also shown that kinematic interactions between the QD states and the electrons in the contacts, renormalizes the QD energies in a spin-dependent fashion. The structure of the renormalization provides an opportunity to include a spin splitting of the QD levels by polarizing the conduction bands in the contacts and/or imposing different hybridizations between the states in the contacts and the QD for the two spin channels. This leads to a substantial amplification of the spin polarization in the current, suggesting applications in magnetic sensors and spin-filters.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Physics
- non-orthogonality
- non-equilibrium
- transport
- nanosystem
- quantum dot
- spin-dependent
- renormalization
- Green function
- diagram technique
- many-body states
- Hubbard operator
- electron correlations
- time-dependent
- Fysik
- icke-ortogonal
- icke-jämvikt
- transport
- nanosystem
- kvantprick
- spinberoende
- renormering
- Green-funktion
- diagramteknik
- mångkropparstillstånd
- Hubbadoperator
- elektronkorrelationer
- tidsberoende
- Physics
- Fysik
- Fysik
- Physics
Publikations- och innehållstyp
- vet (ämneskategori)
- dok (ämneskategori)
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