Magnetization of semiconductor quantum dots

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Erscheinungsjahr:
2002
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Text
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  • We present experimental studies of the magnetization of electrons in semiconductor quantum dots. Starting from a modulation-doped AlGaAs/GaAs heterostructure an array of dots was patterned by laser-interference lithography and deep mesa etching. The quantum-dot array was integrated into a highly sensitive micromechanical cantilever magnetometer. At a temperature of 0.3 K we observe pronounced oscillations in the magnetization. With regard to their periodicity and temperature dependence they differ from the de Haas-van Alphen effect observed in a two-dimensional electron system. We find that the magnetization calculated from the single-particle Fock-Darwin energies of a quantum dot does not reproduce the experiment. From this we conclude that the electronic ground state of the dots is strongly influenced by electron-electron interaction. © 2002 American Institute of Physics.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH

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