Ballistic transport in semiconductor quantum wires in the presence of defects

Rocha, Alexandre Reily; Brum, José M.

doi:10.1590/s0103-97332002000200012

Cited by 2 publications

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“…On the other hand, the zero conductance occurs at the same energy for both systems. This kind of interference effect was previously observed [5,13,14].…”

Section: Resultssupporting

confidence: 73%

Conductance of three-dimensional cross junctions in the quantum ballistic regime

Dacal¹,

Silva

2006

Braz. J. Phys.

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The influence of dimensionality on the conductance of semiconductor cross junctions is investigated in the effective mass approximation and quantum ballistic regime. Our calculations exhibit some similar features for both two-and three-dimensional models, namely the conductance peaks before the fundamental eigenenergy of the quantum wire that represents the sidearms and the zero conductance dip. Despite this, we show that, in general, the conductance and the electronic wave function are strongly affected when the third spatial dimension is taken into account. In other words, we prove that two-dimensional models are not suitable for representing this kind of system.

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“…On the other hand, the zero conductance occurs at the same energy for both systems. This kind of interference effect was previously observed [5,13,14].…”

Section: Resultssupporting

confidence: 73%

Conductance of three-dimensional cross junctions in the quantum ballistic regime

Dacal¹,

Silva

2006

Braz. J. Phys.

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“…In the present situation we are dealing with the quasi-bound states of a double point contact in the resonant tunneling regime, a rather different situation than single quantum point contacts [8], theoretically discussed within a similar framework [9]. Although our main concern is the mapping of quantum dot states, related to resonance shifts in energy, the analysis could also be extended to the behavour of the transmission probability plateaus related to the quantum point contact channels [10].…”

Section: Introductionmentioning

confidence: 99%

Wave-function mapping conditions in open quantum dot structures

Mendoza

Schulz

2003

Phys. Rev. B

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We discuss the minimal conditions for wave function spectroscopy, in which resonant tunneling is the measurement tool. Two systems are addressed: resonant tunneling diodes, as a toy model, and open quantum dots. The toy model is used to analyze the crucial tunning between the necessary resolution in current-voltage characteristics and the breakdown of the wave functions probing potentials into a level splitting characteristic of double quantum wells. The present results establish a parameter region where the wavefunction spectroscopy by resonant tunneling could be achieved. In the case of open quantum dots, a breakdown of the mapping condition is related to a change into a double quantum dot structure induced by the local probing potential. The analogy between the toy model and open quantum dots show that a precise control over shape and extention of the potential probes is irrelevant for wave function mapping. Moreover, the present system is a realization of a tunable Fano system in the wave function mapping regime. PACS number(s) 73.40.Gk,73.21.Fg,73.21.La

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Ballistic transport in semiconductor quantum wires in the presence of defects

Cited by 2 publications

References 0 publications

Conductance of three-dimensional cross junctions in the quantum ballistic regime

Conductance of three-dimensional cross junctions in the quantum ballistic regime

Wave-function mapping conditions in open quantum dot structures

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