Pesquisa | Portal Regional da BVS

1.

Hidden in-plane anisotropy of interfaces in Zn(Mn)Se /BeTe quantum wells with a type-II band alignment.

Yakovlev, D R; Platonov, A V; Ivchenko, E L; Kochereshko, V P; Sas, C; Ossau, W; Hansen, L; Waag, A; Landwehr, G; Molenkamp, L W.

Phys Rev Lett ; 88(25 Pt 1): 257401, 2002 Jun 24.

Artigo em Inglês | MEDLINE | ID: mdl-12097127

RESUMO

Circularly and linearly polarized radiation due to spatially indirect optical transitions is studied in semimagnetic (Zn,Mn)Se/BeTe and nonmagnetic ZnSe/BeTe quantum-well structures with a type-II band alignment. Because of the giant in-plane anisotropy of the optical matrix elements related to a particular interface, complete spin orientation of photocarriers induced by magnetic fields leads not to purely circular but instead to elliptical polarization of the luminescence. From comparison between theory and experiment the parameter of optical anisotropy of a ZnSe/BeTe interface is evaluated. The developed theoretical approach can be applied for the large class of nanostructures revealing optical anisotropy.

2.

Hierarchy of relaxation times in the system of Mn-ion spins in photoexcited semimagnetic quantum wells.

Kulakovskii VD; Tyazhlov MG; Filin AI; Yakovlev DR; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 54(12): R8333-R8336, 1996 Sep 15.

Artigo em Inglês | MEDLINE | ID: mdl-9984588

3.

Interparticle interaction in spin-aligned and spin-degenerate exciton systems and magnetoplasmas in II-VI quantum wells.

Kulakovskii VD; Tyazhlov MG; Dite AF; Filin AI; Forchel A; Yakovlev DR; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 54(7): 4981-4987, 1996 Aug 15.

Artigo em Inglês | MEDLINE | ID: mdl-9986461

4.

Effect of the reduction of dimensionality on the exchange parameters in semimagnetic semiconductors.

Mackh G; Ossau W; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 54(8): R5227-R5230, 1996 Aug 15.

Artigo em Inglês | MEDLINE | ID: mdl-9986575

5.

Resonant tunneling in CdTe/Cd1-xMgxTe double-barrier single-quantum-well heterostructures.

Reuscher G; Keim M; Fischer F; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 53(24): 16414-16419, 1996 Jun 15.

Artigo em Inglês | MEDLINE | ID: mdl-9983481

6.

Recombination and thermal emission of excitons in shallow CdTe/Cd1-xMgxTe quantum wells.

Spiegel R; Bacher G; Herz K; Forchel A; Litz T; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 53(8): 4544-4548, 1996 Feb 15.

Artigo em Inglês | MEDLINE | ID: mdl-9984010

7.

Excitonic lifetimes in (Zn,Cd)Se/ZnSe and ZnSe/Zn(Se,S) quantum wires.

Spiegel R; Bacher G; Herz K; Illing M; Kümmell T; Forchel A; Jobst B; Hommel D; Landwehr G; Söllner J; Heuken M.

Phys Rev B Condens Matter ; 53(8): R4233-R4236, 1996 Feb 15.

Artigo em Inglês | MEDLINE | ID: mdl-9984077

8.

Two-dimensional states at the HgTe/Hg0.05Cd0.95Te interface as determined from the tunneling investigations.

Germanenko AV; Minkov GM; Larionova VA; Rut OE; Becker CR; Landwehr G.

Phys Rev B Condens Matter ; 52(24): 17254-17259, 1995 Dec 15.

Artigo em Inglês | MEDLINE | ID: mdl-9981155

9.

Characterization of a strain-inducing defect in CdTe by magnetoluminescence spectroscopy.

Worschech L; Ossau W; Landwehr G.

Phys Rev B Condens Matter ; 52(19): 13965-13974, 1995 Nov 15.

Artigo em Inglês | MEDLINE | ID: mdl-9980612

10.

Tuning of the quantum-Hall-effect-state-insulator transition by tilting of magnetic field.

Dorozhkin SI; Emeleus CJ; Whall TE; Landwehr G.

Phys Rev B Condens Matter ; 52(16): 11638-11641, 1995 Oct 15.

Artigo em Inglês | MEDLINE | ID: mdl-9980289

11.

Exciton magnetic polarons in short-period CdTe/Cd1-xMnxTe superlattices.

Yakovlev DR; Mackh G; Kuhn-Heinrich B; Ossau W; Waag A; Landwehr G; Hellmann R; Göbel EO.

Phys Rev B Condens Matter ; 52(16): 12033-12038, 1995 Oct 15.

Artigo em Inglês | MEDLINE | ID: mdl-9980344

12.

Double 2s-1s resonance in LO-phonon-assisted secondary emission of quantum-well structures.

Yakovlev DR; Ossau W; Waag A; Landwehr G; Ivchenko EL.

Phys Rev B Condens Matter ; 52(8): 5773-5776, 1995 Aug 15.

Artigo em Inglês | MEDLINE | ID: mdl-9981765

13.

Magneto-optics and valence-band discontinuity in a HgTe-Hg1-xCdxTe superlattice.

von Truchse beta M; Latussek V; Goschenhofer F; Becker CR; Landwehr G; Batke E; Sizmann R; Helgesen P.

Phys Rev B Condens Matter ; 51(24): 17618-17623, 1995 Jun 15.

Artigo em Inglês | MEDLINE | ID: mdl-9978789

14.

Low-temperature anti-Stokes luminescence mediated by disorder in semiconductor quantum-well structures.

Hellmann R; Euteneuer A; Hense SG; Feldmann J; Thomas P; Göbel EO; Yakovlev DR; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 51(24): 18053-18056, 1995 Jun 15.

Artigo em Inglês | MEDLINE | ID: mdl-9978854

15.

Multiple Mn2+-spin-flip Raman scattering at high fields via magnetic polaron states in semimagnetic quantum wells.

Stühler J; Schaack G; Dahl M; Waag A; Landwehr G; Kavokin KV; Merkulov IA.

Phys Rev Lett ; 74(13): 2567-2570, 1995 Mar 27.

Artigo em Inglês | MEDLINE | ID: mdl-10057960

16.

Optical properties of HgSe.

Einfeldt S; Goschenhofer F; Becker CR; Landwehr G.

Phys Rev B Condens Matter ; 51(8): 4915-4925, 1995 Feb 15.

Artigo em Inglês | MEDLINE | ID: mdl-9979362

17.

Exciton magnetic polarons in the semimagnetic alloys Cd1-x-yMnxMgyTe.

Mackh G; Hilpert M; Yakovlev DR; Ossau W; Heinke H; Litz T; Fischer F; Waag A; Landwehr G; Hellmann R; Göbel EO.

Phys Rev B Condens Matter ; 50(19): 14069-14076, 1994 Nov 15.

Artigo em Inglês | MEDLINE | ID: mdl-9975623

18.

Exciton dynamics in disordered quantum wells: Localized and delocalized regimes.

Hellmann R; Cundiff ST; Koch M; Feldmann J; Göbel EO; Kuhn-Heinrich B; Yakovlev DR; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 50(19): 14651-14654, 1994 Nov 15.

Artigo em Inglês | MEDLINE | ID: mdl-9975701

19.

Localized exciton magnetic polarons in Cd1-xMnxTe.

Mackh G; Ossau W; Yakovlev DR; Waag A; Landwehr G; Hellmann R; Göbel EO.

Phys Rev B Condens Matter ; 49(15): 10248-10258, 1994 Apr 15.

Artigo em Inglês | MEDLINE | ID: mdl-10009845

20.

Homogeneous linewidth of excitons in semimagnetic CdTe/Cd1-xMnxTe multiple quantum wells.

Hellmann R; Koch M; Feldmann J; Cundiff ST; Göbel EO; Yakovlev DR; Waag A; Landwehr G.

Phys Rev B Condens Matter ; 48(4): 2847-2850, 1993 Jul 15.

Artigo em Inglês | MEDLINE | ID: mdl-10008697

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