Abstract
We investigate electronic excitations in GaAs–AlGaAs quantum dots by means of resonant inelastic light scattering in the presence of an external magnetic field Image . At magnetic field Image , we observe a series of discrete electronic excitations, namely, charge-density excitations (CDEImage ) and spin-density excitations (SDEImage ), in one and the same quantum dot sample. We find at finite ...
Abstract
We investigate electronic excitations in GaAs–AlGaAs quantum dots by means of resonant inelastic light scattering in the presence of an external magnetic field Image . At magnetic field Image , we observe a series of discrete electronic excitations, namely, charge-density excitations (CDEImage ) and spin-density excitations (SDEImage ), in one and the same quantum dot sample. We find at finite magnetic field, additionally to the well-known splitting of the CDEImage modes (plasmons), a quite similar splitting of the lowest SDE mode whose energy is very close to the single-particle level spacing in the quantum dot. In analogy to the edge magnetoplasmon, we call this excitation an edge spin-density mode.
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