Integrability-based analysis of the hyperfine interaction induced decoherence in quantum dots
- Datum
- 15.08.2013
- Zeit
- 11:20 - 12:05
- Sprecher
- Dirk Schuricht
- Sprache
- en
- Hauptthema
- Physik
- Andere Themen
- Physik
- Host
- QSOE13
- Beschreibung
- We study the decoherence of a spin in a quantum dot due to its hyperfine coupling to a fluctuating bath of nuclear spins. We calculate the spectrum and time evolution of the coherence factor using a Monte Carlo sampling of the exact eigenstates obtained via the algebraic Bethe Ansatz. The exactness of the obtained eigenstates allows us to study the full crossover from strong to weak external magnetic field in a full quantum mechanical treatment. We find a large non-decaying fraction in the zero-field limit which is explained by Bose-Einstein-condensate-like physics. We compare our results to a simple semiclassical picture and find surprisingly good agreement. Finally, we discuss the effect of weakly coupled spins and show that they will eventually lead to complete decoherence.
Letztmalig verändert: 15.08.2013, 09:56:57
Veranstaltungsort
Max-Planck-Institut für Physik komplexer Systeme (Seminarroom 1+2)Nöthnitzer Straße3801187Dresden
- Telefon
- + 49 (0)351 871 0
- MPI-PKS
- Homepage
- http://www.mpipks-dresden.mpg.de
Veranstalter
Max-Planck-Institut für Physik komplexer SystemeNöthnitzer Straße3801187Dresden
- Telefon
- + 49 (0)351 871 0
- MPI-PKS
- Homepage
- http://www.mpipks-dresden.mpg.de
Legende
- Ausgründung/Transfer
- Bauing., Architektur
- Biologie
- Chemie
- Elektro- u. Informationstechnik
- für Schüler:innen
- Gesellschaft, Philos., Erzieh.
- Informatik
- Jura
- Maschinenwesen
- Materialien
- Mathematik
- Medizin
- Physik
- Psychologie
- Sprache, Literatur und Kultur
- Umwelt
- Verkehr
- Weiterbildung
- Willkommen
- Wirtschaft