Interband Optical Transitions in Extremely Anisotropic Semiconductors. III. Numerical Studies of Magneto-Optical Absorption

Shinada, Masaki; Tanaka, Kiyoshi

doi:10.1143/jpsj.29.1258

Cited by 49 publications

(16 citation statements)

References 14 publications

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“…The electronic energy spectrum of quantum well structures is fully quantized under a magnetic field parallel to the growth axis. Optical absorption reveals a ladder of magnetoexcitons corresponding to transitions between electron and hole Landau levels [1]. Magnetic fields also lift the Kramers degeneracy with the resultant Zeeman splitting depending on details of the band structure.…”

Section: Spin-flip-induced Hole Burning In Gaas Quantummentioning

confidence: 98%

Spin-flip-induced hole burning in GaAs quantum wells: Determination of the exciton Zeeman splitting

et al. 1992

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A new method of four-wave-mixing spectroscopy in GaAs quantum wells reveals spectral hole burning due to spin relaxation of magnetoexcitons. The measurements resolve the Zeeman doublet of the lowest-energy heavy-hole exciton where the doublet splitting is much less than the exciton inhomogeneous width. The Zeeman splitting depends nonlinearly on the magnetic field and is small compared with that of bulk GaAs. The results reflect effects of the complex band structure of quantum wells. Information on exciton spin relaxation is also provided by the hole-burning measurements.The electronic energy spectrum of quantum well structures is fully quantized under a magnetic field parallel to the growth axis. Optical absorption reveals a ladder of magnetoexcitons corresponding to transitions between electron and hole Landau levels [1]. Magnetic fields also lift the Kramers degeneracy with the resultant Zeeman splitting depending on details of the band structure. The removal of this degeneracy is also expected to lead to a substantial increase of the spin relaxation time between Zeeman-split Landau levels since now spin relaxation can only take place via inelastic processes.The electron g factor in GaAs heterostructures has been extensively studied. Earlier magnetotransport measurements have shown large exchange-induced enhancement of the electron g [2]. Recent electron-spinresonance studies have revealed the magnetic field dependence of the electron g for different Landau levels [3]. These results were explained in terms of the nonparabolicity of the conduction band [4]. Determination of the exciton Zeeman splitting has proven to be more elusive [5][6][7]. Earlier magnetoreflectance measurements were able to resolve Zeeman splittings for the light-hole but not the heavy-hole exciton [5]. More recent measurements have inferred the exciton g from nonlinear quantum-beat spectroscopy [6]. A precise determination of the exciton Zeeman splitting in a quantum well using linear optical spectroscopy is difficult since interface disorder leads to exciton localization and subsequent inhomogeneous broadening of the absorption profile [8]; the resultant inhomogeneous broadening varies from 1 meV to several meV, much larger than the splitting in moderate fields.A related area is relaxation of carrier and exciton spins in semiconductor heterostructures. Polarization-dependent measurements of interband optical transitions have shown an interesting dependence of spin relaxation on growth conditions, carrier confinement, and temperature [9]. Various physical mechanisms for spin relaxation have also been discussed [9,10]. In addition, luminescence measurements at high magnetic fields have revealed a much larger spin relaxation time due to the full quantization of the energy spectrum [11].In this paper, we report frequency-domain nonlinear optical studies of exciton Zeeman splitting and spin relaxation in GaAs quantum wells. Using selective optical excitation and nonlinear optical methods similar to spectral hole burning (SHB, also referred to ...

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Section: Spin-flip-induced Hole Burning In Gaas Quantummentioning

confidence: 98%

Spin-flip-induced hole burning in GaAs quantum wells: Determination of the exciton Zeeman splitting

et al. 1992

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“…With increasing magnetic field, Landau quantization causes the quasi-2D density of states to evolve into a series of delta functions reminiscent of a quasi-0D density of states as the electron motion becomes fully quantized with the application of a high magnetic field perpendicular to the quantum wells. The weak excitation PL spectra show a single peak of emission near the band edge that increases in strength and shifts to higher energy with increasing magnetic field (diamagnetic shift 36,37 ). Figure 5 displays the results of the time-integrated PL spectra for both center-and edge-collected emission taken at ∼13 K with 5 µJ excitation pulse energy using the amplified Ti:sapphire laser.…”

Section: Time-integrated Photoluminescence and Absorption Spectroscopymentioning

confidence: 99%

A table-top, repetitive pulsed magnet for nonlinear and ultrafast spectroscopy in high magnetic fields up to 30 T

Noe

Nojiri

Lee

et al. 2013

Review of Scientific Instruments

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We have developed a mini-coil pulsed magnet system with direct optical access, ideally suited for nonlinear and ultrafast spectroscopy studies of materials in high magnetic fields up to 30 T. The apparatus consists of a small coil in a liquid nitrogen cryostat coupled with a helium flow cryostat to provide sample temperatures down to below 10 K. Direct optical access to the sample is achieved with the use of easily interchangeable windows separated by a short distance of ∼135 mm on either side of the coupled cryostats with numerical apertures of 0.20 and 0.03 for measurements employing the Faraday geometry. As a demonstration, we performed time-resolved and time-integrated photoluminescence measurements as well as transmission measurements on InGaAs quantum wells.

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“…Using the symmetric gauge A e(h) = B × ρ e(h) /2, we transform the in-plane e-h wave function ( ρ e , ρ h ) as 23 where we have set the center-of-mass momentum to be zero since only these states are relevant to optical transitions. If one writes number, R m (ρ) satisfies the equation…”

Section: B )mentioning

confidence: 99%

Renormalized energies of superfluorescent bursts from an electron-hole magnetoplasma with high gain in InxGa1−xAs quantum wells

et al. 2013

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We study light emission properties of a population-inverted 2D electron-hole plasma in a quantizing magnetic field. We observe a series of superfluorescent (SF) bursts, discrete both in time and energy, corresponding to the cooperative recombination of electron-hole pairs from different Landau levels. Emission energies exhibit strong renormalization due to many-body interactions among the photogenerated carriers, showing pronounced red shifts as large as 20 meV at 15 T. However, the lowest Landau level emission line remains stable against renormalization and show excitonic magnetic field dependence. Interestingly, our time-resolved measurements show that this lowest-energy SF burst occurs only after most upper states become empty, suggesting that this excitonic stability is related to the "hidden symmetry" of 2D magnetoexcitons expected in the magnetic quantum limit.

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Interband Optical Transitions in Extremely Anisotropic Semiconductors. III. Numerical Studies of Magneto-Optical Absorption

Cited by 49 publications

References 14 publications

Spin-flip-induced hole burning in GaAs quantum wells: Determination of the exciton Zeeman splitting

Spin-flip-induced hole burning in GaAs quantum wells: Determination of the exciton Zeeman splitting

A table-top, repetitive pulsed magnet for nonlinear and ultrafast spectroscopy in high magnetic fields up to 30 T

Renormalized energies of superfluorescent bursts from an electron-hole magnetoplasma with high gain in InxGa1−xAs quantum wells

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