Issue Europhys. Lett. Volume 56, Number 5, December 2001 Page(s) 716 - 721 Section Condensed matter: electronic structure, electrical, magnetic, and optical properties DOI 10.1209/epl/i2001-00579-4

DOI: 10.1209/epl/i2001-00579-4


Europhys. Lett., 56 (5) , pp. 716-721 (2001)

Quantum-beat recombination echoes

C. Boehme, P. Kanschat and K. Lips

Hahn-Meitner-Institut Berlin, Abt. SE1 - Kekuléstr. 5, D-12489 Berlin, Germany

boehme@hmi.de

(Received 28 May 2001; accepted 12 September 2001)

Abstract
A recombination echo phenomenon of weakly coupled electron-hole pairs in disordered semiconductors is suggested. The time-domain calculation of spin-dependent recombination within such pairs indicates that dephasing beat oscillations can take place in a magnetic field and a phase recovery due to a resonant microwave pulse is possible. This effect, which we call the quantum-beat recombination echo, is illustrated for different pulse sequences. Applications for material characterisation and quantum computing are suggested.

PACS
72.20.Jv - Charge carriers: generation, recombination, lifetime and trapping.
76.60.Lz - Spin echoes.
76.90.+d - Other topics in magnetic resonances and relaxation.


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