tailieunhanh - Báo cáo hóa học: " Site-controlled quantum dots fabricated using an atomic-force microscope assisted technique"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Site-controlled quantum dots fabricated using an atomic-force microscope assisted technique | Nanoscale Res Lett 2006 1 160-166 DOI s11671-006-9012-x NANO EXPRESS Site-controlled quantum dots fabricated using an atomic-force microscope assisted technique H. Z. Song T. Usuki T. Ohshima Y. Sakuma M. Kawabe Y. Okada K. Takemoto T. Miyazawa S. Hirose Y. Nakata M. Takatsu N. Yokoyama Published online 3 August 2006 to the authors 2006 Abstract An atomic-force microscope assisted technique is developed to control the position and size of self-assembled semiconductor quantum dots QDs . Presently the site precision is as good as nm and the size fluctuation is within 5 with the minimum controllable lateral diameter of 20 nm. With the ability of producing tightly packed and differently sized QDs sophisticated QD arrays can be controllably fabricated for the application in quantum computing. The optical quality of such site-controlled QDs is found comparable to some conventionally self-assembled semiconductor QDs. The single dot photoluminescence of site-controlled InAs InP QDs is studied in detail presenting the prospect to utilize them in quantum communication as precisely controlled single photon emitters working at telecommunication bands. Keywords Quantum dot Site-Control Atomic-force microscope Local oxidation Quantum computer Quantum communication H. Z. Song El T. Usuki T. Ohshima K. Takemoto T. Miyazawa S. Hirose Y. Nakata M. Takatsu N. Yokoyama Nanotechnology Research center Fujitsu Lab. Ltd. Morinosato-Wakamiya 10-1 Atsugi Kanagawa 243-0197 Japan e-mail Y. Sakuma M. Kawabe Nanomaterials Laboratory National Institute for Materials Science NIMS Tsukuba Ibaraki Japan Y. Okada Institute of Applied Physics University of Tsukuba Tsukuba Ibaraki 305-8773 Japan Introduction In general self-assembled semiconductor quantum dots QDs grown in Stranski-Krastanov S-K mode are randomly distributed both in position and size which limits their possible applications 1 . Well ordered QD arrays are quite attractive in many applications .