Observation of a Magnetic-Field-Induced Transition in the Behavior of Extremely Shallow Quantum Well Excitons

Fritze, M.; Ie, Perakis; Getter, Andrew; Knox, Wayne H.; Kw, Goossen; Je, Cunningham; Sa, Jackson

doi:10.1103/physrevlett.76.106

Cited by 25 publications

(18 citation statements)

References 19 publications

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“…Al x Ga 1Ϫx As/GaAs quantum wells ͑QW's͒ with very low Al concentration, known as shallow quantum wells ͑SQW's͒, have been shown to be of considerable interest, mostly for their promising application potential, [1][2][3][4][5][6][7] but also from a fundamental point of view. [8][9][10][11][12][13] Originally, SQW's were developed in order to increase the switching speed of electro-optic devices such as self electro-optic effect devices, photodetectors, or optical logical gates. [14][15][16] This is achieved by reducing the QW barrier height, which tends to reduce the carrier escape time out of biased quantum wells and allow one to increase the operating light intensity.…”

Section: Introductionmentioning

confidence: 99%

Excitonic recombination dynamics in shallow quantum wells

Tignon¹,

Heller²,

Roussignol³

et al. 1998

Phys. Rev. B

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We report a comprehensive study of carrier-recombination dynamics in shallow Al x Ga 1Ϫx As/GaAs quantum wells. At low crystal temperature ͑2 K͒, the excitonic radiative recombination time is shown to be strongly enhanced in shallow quantum wells with xϾ0.01, consistently with a model that takes into account the thermal equilibrium between the three-dimensional exciton gas of the barrier and the two-dimensional exciton gas, which are closer in energy as x decreases. Furthermore, we demonstrate the existence of a thermally activated escape mechanism due to the low effective barrier height in these structures. The nonradiative recombination is shown to dominate the carrier dynamics for temperatures as low as 10 K for xϷ0.01. Our experimental observations are analyzed using three different variational exciton calculations. In particular, we study the crossover from the two-dimensional to the three-dimensional behavior of the exciton, which occurs for x as low as 0.01 and affects mainly the oscillator strength, whereas the transition energies in shallow quantum wells can be calculated, to a large extent, using the same approximations as for conventional quantum wells. The peculiar behavior of the oscillator strength at the crossover to the weak confinement regime is obtained by expansion in a large basis. ͓S0163-1829͑98͒05035-8͔

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Section: Introductionmentioning

confidence: 99%

Excitonic recombination dynamics in shallow quantum wells

Tignon¹,

Heller²,

Roussignol³

et al. 1998

Phys. Rev. B

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“…This Hamiltonian (in various disguises) is fundamental to many Coulomb/Kepler systems: e.g., by slight modifications it can be made to describe the dynamics of excitons in magnetic and electric fields [4] and in quantum wells [5], electronic dynamics in quantum dots [6], and the motional Stark effect in plasmas and white dwarfs [7]. Moreover, systems like atoms in circularly polarized microwave fields [8], or planetary dust under radiation pressure from the sun show similar dynamics [9].…”

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confidence: 99%

1/rDynamics in External Fields: 2D or 3D?

1997

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Wholesale symmetry breaking of the 21͞r potential opens all of configuration space for motion. Despite this, recent experimental studies of atomic versions of such systems can be explained by planar motion alone. We show how the nucleus selects two dimensional motion, and predict how photoabsorption spectra for a hydrogen atom in crossed electric and magnetic fields can be selectively tuned between 2D and 3D. [S0031-9007 (97)02797-X] PACS numbers: 05.45. + b, 03.65.Sq, 32.60. + i, 32.80.Rm

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“…The peculiar optical and electronic properties of nanometric systems with quantum confined electronic states are probably uses in devices. Low-dimensional quantum nano structured such as quantum well (QW), quantum wire (QWR) and quantum dots (QD) have attracted considerable attention in view to their potential uses [6][7][8][9] . Now days QWR nano-structure can be fabricated with monolayer precision with dimension of few nm.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of exciton diamagnetic shift as a function of magnetic field for InAs/InP and self-assembled quantum wires and evaluation of electron energy levels of quantum wire in a transverse magnetic field

2017

JCBSC

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Using the theoretical formalism of Y. Sidor et al.[Phys. Rev. B76, 195320(2007)], we have theoretically studied the exciton confinement in InAs/InP quantum wells(QW) and quantum wires(QWR) in the presence of magnetic field. We have evaluated the exciton diamagnetic shift E  (meV) for QW along z-direction and QWR along 110 in the presence of magnetic field both with wire height and well width. Our theoretically evaluated results show that E  increase with magnetic field B(T) for decreasing well width and wire height. Our results also show that E  evaluated taking parabolic mass is larger than without parabolic mass. In other calculation, our evaluated results for the radii of electron 0.15a . We also observed that E1 (meV)>>E0 (meV) for electron for elliptical QWR. These results confirm that the effect of the magnetic field on the energy of the electron becomes strong as the size of the wire increases. Our theoretically evaluated results are in good agreement with the other theoretical workers. These studies are very important in the sense that the self-assembled InAs/InP QWR and QD (quantum dot) are promising candidates for optical application at the telecommunication wavelength of 1.3 and 1.55  m because of the enhanced charge confinement.Keywords: Exciton confinement, exciton diamagnetic shift, effect of band nonparabolicity, parabolic electron mass, Vacuum electron mass, Photoluminscence spectra, Finite elliptical quantum wire, effective mass approximation, hydrostatic deformed potential, effective electron Rydberg, unstrained conduction band offset, confluent hypergeometric function.

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Observation of a Magnetic-Field-Induced Transition in the Behavior of Extremely Shallow Quantum Well Excitons

Cited by 25 publications

References 19 publications

Excitonic recombination dynamics in shallow quantum wells

Excitonic recombination dynamics in shallow quantum wells

1/rDynamics in External Fields: 2D or 3D?

An evaluation of exciton diamagnetic shift as a function of magnetic field for InAs/InP and self-assembled quantum wires and evaluation of electron energy levels of quantum wire in a transverse magnetic field

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