کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1595007 | 1515712 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Correlation coefficient for dephasing of light-hole excitons and heavy-hole excitons in GaAs quantum wells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Dephasing of light-hole (LH) and heavy-hole (HH) excitons and of the non-radiative LH-HH exciton Raman coherence in weakly-disordered GaAs quantum wells is probed using three-beam transient four-wave mixing (TFWM). By varying the two inter-pulse delays independently, the radiative inter-band and non-radiative intra-band coherences can be probed independently. A theoretical model based on the density matrix and including inhomogeneous broadening and inhomogeneous dephasing rates is fit to the TFWM data to extract the dephasing rates. The dephasing rate of the LH-HH Raman coherence can be expressed as a function of the dephasing rates of the LH and HH excitons and a correlation coefficient, Rph, allowing for the calculation of Rph. We find Rph<0, suggesting that anti-correlated scattering dominates the exciton dephasing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 145, Issues 5â6, February 2008, Pages 303-307
Journal: Solid State Communications - Volume 145, Issues 5â6, February 2008, Pages 303-307
نویسندگان
Amelia G. VanEngen Spivey, Camelia N. Borca, Steven T. Cundiff,