کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1546960 | 997627 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Coherent spin precession of electrons and excitons in charge tunable InP quantum dots Coherent spin precession of electrons and excitons in charge tunable InP quantum dots](/preview/png/1546960.png)
Coherent spin precession of electrons and excitons is observed in charge tunable InP quantum dots under the transverse magnetic field by means of time-resolved Kerr rotation. In a quantum dot doped by one electron, spin precession of the doped electron in the quantum dot starts out of phase with spin precession of the doped electrons in a GaAs substrate just after a trion is formed and persists for more than 2 ns even after the trion recombines. Simultaneously spin precession of a trion (hole) starts. Observation of spin precession of both a doped electron and a trion (hole) confirms creating coherent superposition of an electron and a trion as the initialization process of spin of doped electrons in quantum dots. In a neutral quantum dot, the exciton spin precession starts out of phase with spin precession of the doped electrons in a GaAs substrate and the precession frequency does not converge to 0 at the zero field limit. It contains the electron–hole exchange interaction and corresponds to the splitting between bright and dark excitons under the transverse magnetic field.
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 42, Issue 10, September 2010, Pages 2493–2496