Title:
SPIN FILTER
Document Type and Number:
Japanese Patent JP3834616
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an element which determines easily a direction of carrier spin, in technique of quantum communication, quantum operation, etc.
SOLUTION: A first magnetic semiconductor multiple quantum well structure 2, a non-magnetic semiconductor quantum well structure 3 and a second magnetic semiconductor multiple quantum well structure 4 are formed in this order on a semiconductor substrate 1. The first well structure 2 passes carriers only in the state of down-spin and performs filtering. The second well structure 4 passes carriers only in the state of up-spin and performs filtering. The well structure 3 is irradiated with a subband light corresponding to energy between subbands, thereby determining the amount of filtered carrier, from the amount of charges flowing in the case of excitation to a second subband level.
Inventors:
Hideo Ohno
Keita Otani
Keita Otani
Application Number:
JP2001346909A
Publication Date:
October 18, 2006
Filing Date:
November 13, 2001
Export Citation:
Assignee:
Tohoku University
International Classes:
H01L29/06; H01L29/66; B82Y10/00; H01F10/32; H01L29/221; H04B10/30; H01F1/40; (IPC1-7): H01L29/66; H01L29/06; H01L29/221
Attorney, Agent or Firm:
Kosaku Sugimura
Kazuaki Takami
Hiroshi Tokunaga
Yoshiyuki Iwasa
Shiro Fujitani
Kiyoshi Kuruma
Kazuyuki Tomita
Kazuaki Takami
Hiroshi Tokunaga
Yoshiyuki Iwasa
Shiro Fujitani
Kiyoshi Kuruma
Kazuyuki Tomita