Optical nutation in a magnetized semiconductor quantum well structure

Banerjee, Sharmila; Sen, Pranay K.

doi:10.1006/spmi.1999.0773

Superlattices and Microstructures

1999

DOI: 10.1006/spmi.1999.0773

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Optical nutation in a magnetized semiconductor quantum well structure

Sharmila Banerjee¹,

Pranay K. Sen²

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2004

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References 28 publications

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Optical coherent transient effects in magnetoactive GaAs/AlGaAs quantum well structure

Kapoor¹,

Kumar²,

Sen³

2004

Journal of Applied Physics

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The effect of an external magnetic field on optical coherent transient phenomena has been analyzed for semiconductor quantum well structures (QWS). The Lüttinger Hamiltonian is used to incorporate the complex valence band structure which is modified due to the application of the magnetic field. We have considered a GaAs/AlGaAs QWS with magnetic field applied in the direction perpendicular to the plane of the well. We get two quantum levels due to confinement, and doubly degenerate heavy-hole and light-hole bands corresponding to each quantum level, thus leading to eight hole subbands. This results in an 8×8 Hamiltonian in an appropriately chosen basis. Energy eigenvalues and eigenvectors have been calculated by numerically diagonalizing the above Hamiltonian. The absorption characteristics and the optical coherent transient phenomena have been studied by solving the effective semiconductor Bloch equations in the weak excitation regime. The polarization induced in conjunction with the results obtained by solving the modified Lüttinger Hamiltonian has been used to analyze the transient characteristics. We observe a blueshift in transition energy with an increase in magnetic field. The features are changed dramatically when one includes band mixing. The crossing of subbands in the absence of band-mixing effects changes over to anticrossing behavior when band mixing is included. Multiple oscillations are observed in the optical nutation signal that can be attributed to band-mixing effects. Absorption spectra also show a significant blueshift with an increase in magnetic field and additional peaks appear when band mixing is included.

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Optical coherent transient effects in magnetoactive GaAs/AlGaAs quantum well structure

Kapoor¹,

Kumar²,

Sen³

2004

Journal of Applied Physics

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Optical nutation in a magnetized semiconductor quantum well structure

Cited by 1 publication

References 28 publications

Optical coherent transient effects in magnetoactive GaAs/AlGaAs quantum well structure

Optical coherent transient effects in magnetoactive GaAs/AlGaAs quantum well structure

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