Narrow (= 4 meV) inhomogeneous broadening and its correlation with confinement potential of pyramidal quantum dot arrays

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Leifer, KlausUppsala universitet,Experimentell fysik,Tillämpad materialvetenskap (författare)

The inhomogeneous broadening in the luminescence spectra of ordered arrays of pyramidal GaAsAlGaAs semiconductor quantum dots (QDs) was studied as a function of the dot size. Dot arrays with inhomogeneous broadening as small as 4.1 meV and a corresponding ground state to first excited state transition separation of 28 meV were obtained. By evaluating the QD energy levels using a multiband kp model, the authors estimated that the observed inhomogeneous broadening corresponds to dot height fluctuations of about 1-2 ML across the array.

Pelucchi, E.Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland (författare)
Watanabe, S.Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland (författare)
Michelini, F.Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland (författare)
Dwir, B.Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland (författare)
Kapon, E.Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland (författare)
Uppsala universitetExperimentell fysik (creator_code:org_t)

Ingår i:Applied Physics Letters: AIP Publishing91:8, s. 081106-081106-30003-69511077-3118

Av författaren/redakt...: Leifer, Klaus; Pelucchi, E.; Watanabe, S.; Michelini, F.; Dwir, B.; Kapon, E.

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