Electron dynamics of an artificial atom probed by pulsed microwave spectroscopy
| Autor: | D.W. van der Weide, Hua Qin, J. L. Truitt, Robert H. Blick, Karl Eberl |
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| Rok vydání: | 2002 |
| Předmět: |
Materials science
Mechanical Engineering Coulomb blockade Bioengineering General Chemistry Electronic structure Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Mechanics of Materials Picosecond Relaxation (physics) General Materials Science Rotational spectroscopy Electrical and Electronic Engineering Atomic physics Quantum Quantum tunnelling |
| Zdroj: | Nanotechnology. 14:60-64 |
| ISSN: | 0957-4484 |
| DOI: | 10.1088/0957-4484/14/1/314 |
| Popis: | Using picosecond millimetre-wave impulses we probe the electronic structure and dynamics of electrons in a single quantum dot—the artificial atom—which is essential for understanding their applications such as computational elements and detectors. Although dc transport shows strong elastic cotunnelling in the Coulomb blockade (CB) regime, this effect is suppressed under picosecond impulses whose energies are commensurate with those of the dot. Under non-zero bias we find excited-state resonances in the induced complex photoconductance as well as strong deviations of the dot capacitance compared to equilibrium values according to the 'orthodox model' of CB, a direct signature of the relaxation times of single-electron tunnelling. |
| Databáze: | OpenAIRE |
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