Ultracold Gas of Excitons in Traps
Abstract
We studied indirect excitons in coupled quantum wells. The main results are: 1. We discovered condensation and spontaneous coherence of excitons in a trap [Nano Lett. 12, 2605 (2012)]. 2. We discovered patterns of spontaneous coherence, spin textures, and phase singularities in a cold exciton gas [Nature 483, 584 92012)]. 3. We developed methods to trap cold excitons [Nano Lett. 9, 2094 (2009); Phys. Rev. Lett. 103, 087403 (2009); Appl. Phys. Lett. 97, 201106 (2010)]. 4. We developed excitonic conveyer [Phys. Rev. Lett. 106, 196806 (2011)]. It realizes controlled transport of excitons as CCD realize controlled transport of electrons. 5. We developed excitonic devices operating at 100 K [Nature Photonics 3, 577 (2009)]. This is a two orders of magnitude increase in the operation temperature of excitonic devices compared to the previous record. 6. We measured kinetics of the inner ring in the exciton pattern formation and determined exciton transport characteristics [Phys. Rev. B 80, 155331 (2009)]. 7. We measured the exciton front propagation in photoexcited GaAs quantum wells by time resolved imaging. These measurements afford a contactless method for probing the electron and hole transport [Phys. Rev. B 81, 115320 (2010)]. 8. We demonstrated experimental proof of principle for all-optical excitonic transistors [Opt. Lett. 35, 1587 (2010)].
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 08, 2012
- Accession Number
- ADA582625
Entities
People
- L. V. Butov
Organizations
- University of California, San Diego