Nonlinear ground-state absorption observed in a single quantum dot

Beham, Evelin; Zrenner, Artur; Findeis, Frank; Bichler, Max; Abstreiter, Gerhard
October 2001
Applied Physics Letters;10/22/2001, Vol. 79 Issue 17, p2808
Academic Journal
We report level bleaching in the ground state of a single In[sub 0.5]Ga[sub 0.5]As quantum dot. This behavior arises from the nonlinear absorption of a single quantum state. The level bleaching is observed in terms of a saturation of the photocurrent with increasing excitation power under the condition of resonant excitation in the quantum dot ground state. Furthermore, the photocurrent saturation is put down to a fundamental rate equation model. The steady-state solutions are in good agreement with the experimentally observed power dependence of the photocurrent. © 2001 American Institute of Physics.


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