All-electrical measurement of the triplet-singlet spin relaxation time in self-assembled quantum dots
| Autor: | Andreas D. Wieck, Axel Lorke, K. Eltrudis, Martin Geller, Arne Ludwig, Amran Al-Ashouri, A. Beckel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics and Astronomy (miscellaneous)
Condensed matter physics Chemistry Quantum point contact 02 engineering and technology Electron Physik (inkl. Astronomie) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Quantum dot Excited state 0103 physical sciences Singlet state Atomic physics Triplet state 010306 general physics 0210 nano-technology Fermi gas Quantum tunnelling |
| Popis: | We have measured the spin relaxation time of an excited two-electron spin-triplet state into its singlet ground state in self-assembled InAs/GaAs quantum dots. We use a time-resolved measurement scheme that combines transconductance spectroscopy with spin-to-charge conversion to address the |s↑,p↑〉 triplet state, where one electron is in the quantum dot s-shell and a second one in the p-shell. The evaluation of the state-selective tunneling times from the dots into a nearby two-dimensional electron gas allows us to determine the s- and p-shell occupation and extract the relaxation time from a rate equation model. A comparably long triplet-to-singlet spin relaxation time of 25 μs is found. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|