Submitted on: 20 March 2011.
Revised on: 12 April 2011.
Accepted on: 27 April 2011.
Semiconductor Physics Quantum Electronics & Optoelectronics
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Submitted on: 22 April 2016.
Revised on: 02 May 2016.
Accepted on: 13 May 2016.
Semiconductor Physics Quantum Electronics & Optoelectronics
Submitted on: 24 June 2016.
Revised on: 17 July 2016.
Accepted on: 29 July 2016.
Semiconductor Physics Quantum Electronics & Optoelectronics
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