Spin Relaxation by Transient Monopolar and Bipolar Optical Orientation
Murdin, B. N., Litvinenko, K., Clarke, D. G., Pidgeon, C. R., Murzyn, P., Phillips, P. J., Carder, D., Berden, G., Redlich, B., van der Meer, A. F. G., Clowes, S., Harris, J. J., Cohen, L. F., Ashley, T. and Buckle, L. (2006) Spin Relaxation by Transient Monopolar and Bipolar Optical Orientation Physical Review Letters, 96 (096603).
We have used two-color time-resolved spectroscopy to measure the relaxation of electron spin polarizations in a bulk semiconductor. The circularly polarized pump beam induces a polarization either by direct excitation from the valence band, or by free-carrier (Drude) absorption when tuned to an energy below the band gap. We find that the spin relaxation time, measured with picosecond time resolution by resonant induced Faraday rotation in both cases, increases in the presence of photogenerated holes. In the case of the material chosen, n-InSb, the increase was from 14 to 38 ps.
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
|Date :||10 March 2006|
|Identification Number :||10.1103/PhysRevLett.96.096603|
|Additional Information :||Published in Physical Review Letters, 96, 096603. © 2006 The American Physical Society.|
|Depositing User :||Mr Adam Field|
|Date Deposited :||27 May 2010 14:44|
|Last Modified :||23 Sep 2013 18:35|
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