Phase coherence in the cotunneling regime of a coupled double quantum dot
| Autor: | Klaus Ensslin, Thomas Ihn, Werner Wegscheider, Matthias Reinwald, Martin Sigrist |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics
73.63.Kv 03.65.-w 73.40.Gk 73.23.Hk Condensed matter physics Oscillation Aharonov–Bohm effect Coupled double dot Cotunneling Conductance Heterojunction Quantum Physics 530 Physik Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Tunnel effect Interferometry symbols.namesake Quantum dot symbols Coherence (physics) |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 34:497-499 |
| ISSN: | 1386-9477 |
| DOI: | 10.1016/j.physe.2006.03.059 |
| Popis: | Low-temperature transport measurements were performed on a two-terminal Aharonov–Bohm interferometer with one Coulomb-blockaded quantum dot (QD) embedded in each of the two interfering paths. Layered local anodic oxidation of the Ga[Al]As heterostructure and a thin titanium top gate give full tunability of the inter-dot tunnel coupling from purely capacitive to the QD molecule regime and of the tunnel coupling of the dots to the Aharonov–Bohm ring leads. Aharonov–Bohm oscillations are observed in the cotunneling regime far away from conductance resonances. This indicates that transport in the cotunneling regime is at least partially phase coherent. The phase of the Aharonov–Bohm oscillations is monitored as one crosses conductance resonances around a degeneracy point in the charge stability diagram. The phase in this two-terminal device is constant in the cotunneling regime between conductance resonances. |
| Databáze: | OpenAIRE |
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