Photon-assisted electron transport for resonant tunneling has been investigated by using a current formula developed based on the nonequilibrium Green's function technique. We have studied the external frequency dependence as well as the energy level position dependence for the resonant ac tunneling
Probing the coherent transport through coupled quantum dots
โ Scribed by R.H. Blick; D.W. van der Weide; R.J. Haug; K. von Klitzing; K. Eberl
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 154 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0749-6036
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โฆ Synopsis
We investigate the photoconductance through a double quantum dot or 'artificial molecule' induced by a broadband millimeter wave source. This source functions as a heterodyne interferometer, consisting of two nonlinear transmission lines generating harmonic output in the range of 2-400 GHz, and, being coherent, allows tracking of the induced current of the sample in both magnitude and phase. This enables us to monitor effects related to coherent electronic transport through these 'artificial molecules'.
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In this paper we review our recent study of coherent electronic properties of coupled twodimensional quantum dot arrays using numerical exact-diagonalization methods on a Mott-Hubbard type correlated tight-binding model. We predict the existence of a novel kind of persistent current in a two-dimensi
Dedicated to Professor Dr. Roland Zimmermann on the occasion of his 60th birthday Advances in nanoscopic probing techniques have led to the development of direct spatial and spectroscopic mapping methodologies which have revealed a wealth of information about single quantum dots. These techniques, c