Mn spin domains in highly photoexcited (cd,mn)te/(cd,mg)te quantum wells

Physical Review B - Condensed Matter and Materials Physics

Volumn 59, Issue 3, 1999, Pages 2050-2056

  Yakovlev, D R ^b   Waag, A ^b   Landwehr, G ^b  

^a INSTITUTE OF SOLID STATE PHYSICS   (Russian Federation)

^b UNIVERSITY OF LEIPZIG   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000572619     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.59.2050     Document Type: Article

References (23)

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14. In general, the maximum of the (Formula presented) plasma emission, as well as the energy of the 0-0 transition, does not coincide with the band gap edge because of broadening of the emission line and interparticle interaction (Refs. 1, 3, and 10). However, so far as we consider only the relative shift of the (Formula presented) plasma emission line in external magnetic field, this circumstance can be neglected.
15. The sum of the bound states spin splitting, (Formula presented) at (Formula presented) and (Formula presented) is divided between the splittings in the conduction and valence bands in accordance, with the ratio between the exchange integrals (Ref. 8), (Formula presented) and (Formula presented) i.e., the conduction-band splitting is much smaller than the hole one. On the contrary, the electron Fermi energy (Formula presented) is much larger than the hh Fermi energy (Formula presented) because (Formula presented) (Ref. 16). As a result, even at (Formula presented) when (Formula presented) is up to 60 meV, (Formula presented) which is smaller then (Formula presented) Therefore, the holes should be highly spin polarized. In contrast, in the case of electrons, we have (Formula presented) with a partial spin polarization of electrons at pumping power as low as (Formula presented)
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17. A. Abragam, The Principles of Nuclear Magnetism (Clarendon Press, Oxford, 1961), p. 334.
18. In our case this assumption means that electron spin relaxation time should be shorter than ns scale, which has been recently supported by our experimental measurements of exciton spin relaxation time in similar (Formula presented) superlattice (10 nm/10 nm) (Ref. 19). Very short, about 5 ps characteristic time of exciton spin relaxation has been observed. This time becomes shorter when excitonic density increases. Thus, this assumption is in agreement with our experimental conditions.
19. M. Tyazhlov, M. D. Martin, L. Vina, and L. L. Chang (unpublished).
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21. Landau quantization of electron states leads to a dependence of the spin relaxation rate (Formula presented) on the electron spin splitting because (Formula presented) is proportional to the convolution between different spin subbands (Formula presented) (Ref. 11). As a consequence, (Formula presented) must oscillate with the electron spin splitting (Formula presented) with maxima at positions where the resonant conditions are satisfied [Eq. (4.4)].
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