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Gunawan O, Shkolnikov YP, Poortere EPD, Tutuc E, Shayegan M. Ballistic electron transport in AlAs quantum wells. PHYSICAL REVIEW LETTERS 2004; 93:246603. [PMID: 15697841 DOI: 10.1103/physrevlett.93.246603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2004] [Indexed: 05/24/2023]
Abstract
We report the observation of commensurability oscillations in an AlAs two-dimensional electron system where two conduction-band valleys with elliptical in-plane Fermi contours are occupied. The Fourier power spectrum of the oscillations shows two frequency components consistent with those expected for the Fermi contours of the two valleys. From an analysis of the spectra we deduce m(l)/m(t)=5.2+/-0.5 for the ratio of the longitudinal and transverse electron effective masses, a fundamental parameter that cannot be directly measured from other transport experiments.
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Affiliation(s)
- O Gunawan
- Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
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Shkolnikov YP, Vakili K, De Poortere EP, Shayegan M. Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom. PHYSICAL REVIEW LETTERS 2004; 92:246804. [PMID: 15245121 DOI: 10.1103/physrevlett.92.246804] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2004] [Indexed: 05/24/2023]
Abstract
We report measurements of the spin susceptibility, chi proportional, variant g(v)g*m*, in an AlAs two-dimensional electron system where, via the application of in-plane stress, we transfer electrons from one ellipsoidal conduction-band valley to another (g(v) is the valley degeneracy, and m* and g* are the electron effective mass and g factor). At a given density, when the two valleys are equally populated (g(v)=2), the measured g*m* is smaller than when only one valley is occupied (g(v)=1). This observation counters the common assumption that a two-valley two-dimensional system is effectively more dilute than a single-valley system because of its smaller Fermi energy.
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Affiliation(s)
- Y P Shkolnikov
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
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Vakili K, Shkolnikov YP, Tutuc E, De Poortere EP, Shayegan M. Spin susceptibility of two-dimensional electrons in narrow AlAs quantum wells. PHYSICAL REVIEW LETTERS 2004; 92:226401. [PMID: 15245241 DOI: 10.1103/physrevlett.92.226401] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2003] [Indexed: 05/24/2023]
Abstract
We report measurements of the spin susceptibility in dilute two-dimensional electrons confined to a 45 A wide AlAs quantum well. The electrons in this well occupy an out-of-plane conduction-band valley, rendering a system similar to two-dimensional electrons in Si-MOSFETs but with only one valley occupied. We observe an enhancement of the spin susceptibility over the band value that increases as the density is decreased, following closely the prediction of quantum Monte Carlo calculations and continuing at finite values through the metal-insulator transition.
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Affiliation(s)
- K Vakili
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
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Vakili K, Shkolnikov YP, Tutuc E, De Poortere EP, Shayegan M. Realization of an interacting two-valley AlAs bilayer system. PHYSICAL REVIEW LETTERS 2004; 92:186404. [PMID: 15169516 DOI: 10.1103/physrevlett.92.186404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2003] [Indexed: 05/24/2023]
Abstract
By using different widths for two AlAs quantum wells comprising a bilayer system, we force the X-point conduction-band electrons in the two layers to occupy valleys with different Fermi contours, electron effective masses, and g factors. Since the occupied valleys are at different X points of the Brillouin zone, the interlayer tunneling is negligibly small despite the close electron layer spacing. We demonstrate the realization of this system via magnetotransport measurements and the observation of a phase-coherent, bilayer nu=1 quantum Hall state flanked by a reentrant insulating phase.
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Affiliation(s)
- K Vakili
- Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
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De Poortere EP, Tutuc E, Shayegan M. Critical resistance in the AlAs quantum Hall ferromagnet. PHYSICAL REVIEW LETTERS 2003; 91:216802. [PMID: 14683327 DOI: 10.1103/physrevlett.91.216802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2003] [Indexed: 05/24/2023]
Abstract
Magnetic transitions in AlAs two-dimensional electrons give rise to sharp resistance spikes within the quantum Hall effect. Such spikes are likely caused by carrier scattering at magnetic domain walls below the Curie temperature. We report a critical behavior in the temperature dependence of the spike width and amplitude, from which we deduce the Curie temperature of the quantum Hall ferromagnet. Our data also reveal that the Curie temperature increases monotonically with carrier density.
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Affiliation(s)
- E P De Poortere
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
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Characterization of ultrashort-period GaAs/AlAs superlattices by exciton photoluminescence. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2002. [DOI: 10.1016/s0928-4931(01)00442-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Langbein W, Kalt H, Hvam JM. Luminescence dynamics in type-II GaAs/AlAs superlattices near the type-I to type-II crossover. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:14589-14594. [PMID: 9985466 DOI: 10.1103/physrevb.54.14589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Tribe WR, Klipstein PC, Smith GW, Grey R. Uniaxial-stress investigation of the phonon-assisted recombination mechanisms associated with the X states in type-II GaAs/AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:8721-8727. [PMID: 9984550 DOI: 10.1103/physrevb.54.8721] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Teissier R, Finley JJ, Skolnick MS, Cockburn JW, Pelouard J, Grey R, Hill G, Pate MA, Planel R. Experimental determination of Gamma -X intervalley transfer mechanisms in GaAs/AlAs heterostructures. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R8329-R8332. [PMID: 9984587 DOI: 10.1103/physrevb.54.r8329] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fu LP, Bacalzo FT, Gilliland GD, Chen R, Bajaj KK, Klem J, Wolford DJ. Microscopic mechanisms governing exciton-decay kinetics in type-II GaAs/AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:2682-2687. [PMID: 9981337 DOI: 10.1103/physrevb.52.2682] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fu LP, Bacalzo FT, Gilliland GD, Chen R, Bajaj KK, Klem J. cw photoluminescence determination of thermally activated fast X--> Gamma interlayer electron scattering in type-II GaAs/AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:17630-17634. [PMID: 9978791 DOI: 10.1103/physrevb.51.17630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Tribe WR, Klipstein PC, Woolley RA, Roberts JS. Phonon satellite strengths in the photoluminescence spectra of a type-II GaAs/Al0.3Ga0.7As superlattice at elevated pressures. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:9735-9741. [PMID: 9977641 DOI: 10.1103/physrevb.51.9735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Langbein W, Hallstein S, Kalt H, Nötzel R, Ploog K. Negative-differential band-gap renormalization in type-II GaAs/AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:1946-1949. [PMID: 9978923 DOI: 10.1103/physrevb.51.1946] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nakayama M, Imazawa K, Suyama K, Tanaka I, Nishimura H. Gamma -X mixing effects on pseudodirect exciton transitions in GaAs/AlAs type-II superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:13564-13570. [PMID: 10010293 DOI: 10.1103/physrevb.49.13564] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yamada S, Maezawa K, Yuen WT, Stradling RA. X-conduction-electron transport in very thin AlAs quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:2189-2192. [PMID: 10011033 DOI: 10.1103/physrevb.49.2189] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Voliotis V, Grousson R, Lavallard P, Ivchenko EL, Kiselev AA, Planel R. Absorption coefficient in type-II GaAs/AlAs short-period superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:2576-2584. [PMID: 10011089 DOI: 10.1103/physrevb.49.2576] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gilliland GD, Antonelli A, Wolford DJ, Bajaj KK, Klem J, Bradley JA. Direct measurement of heavy-hole exciton transport in type-II GaAs/AlAs superlattices. PHYSICAL REVIEW LETTERS 1993; 71:3717-3720. [PMID: 10055054 DOI: 10.1103/physrevlett.71.3717] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Charbonneau S, Young JF, Coleridge PT. Intervalley scattering time in type-II AlxGa1-xAs/AlAs multiple quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:1932-1935. [PMID: 10008565 DOI: 10.1103/physrevb.48.1932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zimmermann R, Bimberg D. Interface excitons in staggered-line-up quantum wells: The AlAs/GaAs case. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:15789-15793. [PMID: 10005975 DOI: 10.1103/physrevb.47.15789] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gourdon C, Lavallard P. Fine structure of heavy excitons in GaAs/AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:4644-4650. [PMID: 10004221 DOI: 10.1103/physrevb.46.4644] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Galbraith I, Dawson P, Foxon CT. Optical nonlinearities in mixed type I-type II GaAs/AlAs multiple quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:13499-13508. [PMID: 10001438 DOI: 10.1103/physrevb.45.13499] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Laks DB, Zunger A. Identity of the conduction-band minimum in (AlAs)1/(GaAs)1 (001) superlattices: Intermixing-induced reversal of states. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:11411-11414. [PMID: 10001083 DOI: 10.1103/physrevb.45.11411] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Boring P, Gil B, Moore KJ. Optical properties and electronic structure of thin (Ga,In)As-AlAs multiple quantum wells and superlattices under internal and external strain fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:8413-8423. [PMID: 10000678 DOI: 10.1103/physrevb.45.8413] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Branis SV, Bajaj KK. Calculation of the exciton binding energies in type-II GaAs/AlAs quantum-well structures: Application of the perturbation-variational expansion method. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:6271-6274. [PMID: 10000377 DOI: 10.1103/physrevb.45.6271] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Nötzel R, Ledentsov NN, Däweritz L, Ploog K, Hohenstein M. Semiconductor quantum-wire structures directly grown on high-index surfaces. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:3507-3515. [PMID: 10001928 DOI: 10.1103/physrevb.45.3507] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cen J, Branis SV, Bajaj KK. Exciton binding energies in finite-barrier type-II quantum-well structures in a magnetic field. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:12848-12856. [PMID: 9999463 DOI: 10.1103/physrevb.44.12848] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Branis SV, Cen J, Bajaj KK. Effect of magnetic fields on exciton binding energies in type-II GaAs-AlAs quantum-well structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:11196-11202. [PMID: 9999239 DOI: 10.1103/physrevb.44.11196] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Charbonneau S, Young JF, Coleridge PT, Kettles B. Experimental determination of the X6 shear tetragonal deformation potential of AlAs. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:8312-8314. [PMID: 9998769 DOI: 10.1103/physrevb.44.8312] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Olbright GR, Fu WS, Klem JF, Gibbs HM, Khitrova G, Pon R, Fluegel B, Meissner K, Peyghambarian N, Binder R, Galbraith I, Koch SW. Nonlinear optical properties of type-II quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:3043-3053. [PMID: 9999896 DOI: 10.1103/physrevb.44.3043] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ge W, Schmidt WD, Sturge MD, Pfeiffer LN, West KW. Conduction-band minimum of (GaAs)1/(AlAs)1 superlattices: Relationship to X minimum of AlAs. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:3432-3435. [PMID: 9999961 DOI: 10.1103/physrevb.44.3432] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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31
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Binder R, Galbraith I, Koch SW. Theory of band-edge optical nonlinearities in type-I and type-II quantum-well structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:3031-3042. [PMID: 9999895 DOI: 10.1103/physrevb.44.3031] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Glaser ER, Kennedy TA, Molnar B, Sillmon RS, Spencer MG, Mizuta M, Kuech TF. Optically detected magnetic resonance of group-IV and group-VI impurities in AlAs and AlxGa1-xAs with x >= 0.35. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:14540-14556. [PMID: 9997345 DOI: 10.1103/physrevb.43.14540] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kalt H, Rühle WW, Reimann K, Rinker M, Bauser E. Alloy-disorder-induced intervalley coupling. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:12364-12373. [PMID: 9997033 DOI: 10.1103/physrevb.43.12364] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Montie EA, Henning JC, Cosman EC. Optically detected magnetic resonance of Si donors in AlxGa1-xAs. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:11808-11817. [PMID: 9995489 DOI: 10.1103/physrevb.42.11808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Young JF, Charbonneau S, Coleridge PT. Determination of Xz-Xx,y energy separation and intervalley relaxation times in type-II AlxGa1-xAs/AlAs multiple quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:11434-11437. [PMID: 9995449 DOI: 10.1103/physrevb.42.11434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Morrison I, Brown LD, Jaros M. Valley-mixing effects in (GaAs)l(AlAs)m superlattices with microscopically imperfect interfaces. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:11818-11825. [PMID: 9995490 DOI: 10.1103/physrevb.42.11818] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Feldmann J, Nunnenkamp J, Peter G, Göbel E, Kuhl J, Ploog K, Dawson P, Foxon CT. Experimental study of the Gamma -X electron transfer in type-II (Al,Ga)As/AlAs superlattices and multiple-quantum-well structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:5809-5821. [PMID: 9996167 DOI: 10.1103/physrevb.42.5809] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kaufmann U, Wilkening W, Mooney PM, Kuech TF. Strain splitting of the X-conduction-band valleys and quenching of spin-valley interaction in indirect GaAs/AlxGa1-xAs:Si heterostructures. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:10206-10209. [PMID: 9993413 DOI: 10.1103/physrevb.41.10206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cosman EC, Foxon CT. Fine structure of excitons in type-II GaAs/AlAs quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:5283-5292. [PMID: 9994391 DOI: 10.1103/physrevb.41.5283] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lefebvre P, Gil B, Mathieu H, Planel R. Piezospectroscopy of GaAs-AlAs superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:7802-7813. [PMID: 9991207 DOI: 10.1103/physrevb.40.7802] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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