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Electron effective mass determined from experimental electron eigen-energies in InGaAs/InAlas multi-quantum wells | IEEE Conference Publication | IEEE Xplore

Electron effective mass determined from experimental electron eigen-energies in InGaAs/InAlas multi-quantum wells


Abstract:

In a In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells structure, interband transitions were clearly observed in a photocurrent difference spectrum. Using an assumption t...Show More

Abstract:

In a In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells structure, interband transitions were clearly observed in a photocurrent difference spectrum. Using an assumption that the energy dependence of electron effective mass varied smoothly toward higher energy, its nonparabolicity was explicitly determined from 0.041 m0 to 0.07 m0 in conduction quantum well.
Date of Conference: 25-29 May 2008
Date Added to IEEE Xplore: 09 December 2008
ISBN Information:
Print ISSN: 1092-8669
Conference Location: Versailles, France

I. Introduction

Quantum wells or hetero-junctions have been recently attracting considerable attention because of their unique possibilities applicable for novel optical and electrical devices. In multi-quantum wells (MQWs) of III-V compounds the confinement of free-carrier motion to the lager plane leads to quantized states, whose energies depend on the well width and the III - V materials. The resulting alternation of the two-dimensional density of states, which lead to sets of electron subbands and enhancement of the exciton binding energy and oscillator strength, is observed in photocurrent, absorption, luminescence investigations. Quantitative understanding about the band structure of such material, however, is not sufficient. The energy and wave number, , dispersion of electron subbands in the bulk is roughly parabolic, but it is conceivable that the degree of nonparabolicity can be different in quantum wells compared to the bulk [1]. The eigen-energy of an electron subband can often be determined to a reasonable accuracy by the envelope function model calculation near the well bottom. For the subbands fairly far from the conduction bandedge of bulk, correction due to the nonparabolicity in the conduction band can be important.

References

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