Details
| Original language | English |
|---|---|
| Pages (from-to) | 531-534 |
| Number of pages | 4 |
| Journal | Physica Status Solidi (A) Applied Research |
| Volume | 178 |
| Issue number | 1 |
| Publication status | Published - 14 Jun 2000 |
| Externally published | Yes |
| Event | Optics of Excitons in Confined Systems (OECS-6) - Ascona, Switz Duration: 30 Aug 1999 → 2 Sept 1999 |
Abstract
The signature of motional narrowing in the spin relaxation of excitons is the inverse proportionality between the spin relaxation time τs and the momentum relaxation time T2. We find such a relation in ZnSe quantum wells over a range of temperatures reaching from 8 up to 200 K. For low temperatures T<60 K where the excitonic T2 is determined by scattering with acoustic phonons motional narrowing might be the reason for the increase of spin lifetime. But for higher temperatures where exciton ionization by optical phonons dominates we attribute the effect to a suppression of electron-hole exchange interaction due to the reduced spatial overlap of electron and hole wave functions.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physica Status Solidi (A) Applied Research, Vol. 178, No. 1, 14.06.2000, p. 531-534.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Motional narrowing in the spin relaxation of free excitons?
AU - Hoffmann, J.
AU - Wachter, S.
AU - Kalt, H.
AU - Hägele, Daniel
AU - Oestreich, Michael
PY - 2000/6/14
Y1 - 2000/6/14
N2 - The signature of motional narrowing in the spin relaxation of excitons is the inverse proportionality between the spin relaxation time τs and the momentum relaxation time T2. We find such a relation in ZnSe quantum wells over a range of temperatures reaching from 8 up to 200 K. For low temperatures T<60 K where the excitonic T2 is determined by scattering with acoustic phonons motional narrowing might be the reason for the increase of spin lifetime. But for higher temperatures where exciton ionization by optical phonons dominates we attribute the effect to a suppression of electron-hole exchange interaction due to the reduced spatial overlap of electron and hole wave functions.
AB - The signature of motional narrowing in the spin relaxation of excitons is the inverse proportionality between the spin relaxation time τs and the momentum relaxation time T2. We find such a relation in ZnSe quantum wells over a range of temperatures reaching from 8 up to 200 K. For low temperatures T<60 K where the excitonic T2 is determined by scattering with acoustic phonons motional narrowing might be the reason for the increase of spin lifetime. But for higher temperatures where exciton ionization by optical phonons dominates we attribute the effect to a suppression of electron-hole exchange interaction due to the reduced spatial overlap of electron and hole wave functions.
UR - http://www.scopus.com/inward/record.url?scp=0033748462&partnerID=8YFLogxK
U2 - 10.1002/1521-396X(200003)178:1<531::AID-PSSA531>3.0.CO;2-1
DO - 10.1002/1521-396X(200003)178:1<531::AID-PSSA531>3.0.CO;2-1
M3 - Conference article
AN - SCOPUS:0033748462
VL - 178
SP - 531
EP - 534
JO - Physica Status Solidi (A) Applied Research
JF - Physica Status Solidi (A) Applied Research
SN - 0031-8965
IS - 1
T2 - Optics of Excitons in Confined Systems (OECS-6)
Y2 - 30 August 1999 through 2 September 1999
ER -