2011
DOI: 10.1063/1.3640889
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Single-particle and collective excitations in quantum wires made up of vertically stacked quantum dots: Zero magnetic field

Abstract: We report on the theoretical investigation of the elementary electronic excitations in a quantum wire made up of vertically stacked self-assembled InAs/GaAs quantum dots. The length scales (of a few nanometers) involved in the experimental setups prompt us to consider an infinitely periodic system of two-dimensionally confined (InAs) quantum dot layers separated by GaAs spacers. The resultant quantum wire is characterized by a two-dimensional harmonic confining potential in the x-y plane and a periodic (Kronig… Show more

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Cited by 8 publications
(10 citation statements)
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“…7, the peak-to-peak amplitude of the effective Fermi energy is observed to increase with increasing confinement. This is the observation we expect intuitively for a constant -and even for zero [62] -magnetic field. The lower panel shows the Fermi energy as well as the effective Fermi energy versus the magnetic field, for a given value of the to infer that while the Fermi energy increases with increasing both magnetic field and confinement, the effective Fermi energy decreases (increases) with increasing magnetic field (confinement) -while keeping the confinement (magnetic field) constant.…”
Section: G the Fermi Energysupporting
confidence: 86%
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“…7, the peak-to-peak amplitude of the effective Fermi energy is observed to increase with increasing confinement. This is the observation we expect intuitively for a constant -and even for zero [62] -magnetic field. The lower panel shows the Fermi energy as well as the effective Fermi energy versus the magnetic field, for a given value of the to infer that while the Fermi energy increases with increasing both magnetic field and confinement, the effective Fermi energy decreases (increases) with increasing magnetic field (confinement) -while keeping the confinement (magnetic field) constant.…”
Section: G the Fermi Energysupporting
confidence: 86%
“…We observe that the DOS peaks start shifting towards the higher energy, but the energy separation between them becomes smaller with increasing magnetic field. For B = 0, it was found that while the DOS peaks shift towards higher energy, they start distancing from each other with increasing confinement potential [62]. This implies that the role of an applied magnetic field is virtually more than just to boost the confinement.…”
Section: F the Density Of Statesmentioning
confidence: 98%
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