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Submitted on: 17 January 1998.
Revised on: 03 March 1998.
Accepted on: 26 March 1998.
___________________Applied Physics Express---IOP PUBLISHING LTD
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Submitted on: 25 May 2006.
Revised on: 04 August 2006.
Accepted on: 09 September 2006.
___________________Applied Physics Express---IOP PUBLISHING LTD
Submitted on: 15 October 2005.
Revised on: 19 November 2005.
Accepted on: 10 December 2005.
___________________Applied Physics Express---IOP PUBLISHING LTD
Submitted on: 06 October 2017.
Revised on: 27 December 2017.
Accepted on: 30 January 2018.
___________________Applied Physics Express---IOP PUBLISHING LTD