Interaction corrections to transport due to quasibound states in open quantum dots

Indlekofer, K. M.; Bird, J. P.; Akis, R.; Ferry, D. K.; Goodnick, Stephen M.

doi:10.1063/1.1521584

Cited by 6 publications

(8 citation statements)

References 17 publications

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“…However, for most applications it is sufficient to consider a vector w that maximizes the entropy at an effective temperature T * (T, V G , V D ) under the (weaker) subsidiary condition that ρMB [w] = ρ within the relevant subspace, where ρMB [w] denotes the many-body result. 19,28,29 (Under moderate bias conditions, it is justified to assume T * ≈ T . )…”

Section: Multi-configurational Self-consistent Green's Functionmentioning

confidence: 99%

Quantum kinetic description of Coulomb effects in one-dimensional nanoscale transistors

Indlekofer

Knoch

Appenzeller³

2005

Phys. Rev. B

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In this paper, we combine the modified electrostatics of a one-dimensional transistor structure with a quantum kinetic formulation of Coulomb interaction and nonequilibrium transport. A multi-configurational self-consistent Green's function approach is presented, accounting for fluctuating electron numbers. On this basis we provide a theory for the simulation of electronic transport and quantum charging effects in nanotransistors, such as a gated carbon nanotube and whisker devices and one-dimensional CMOS transistors. Singleelectron charging effects arise naturally as a consequence of the Coulomb repulsion within the channel.

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Section: Multi-configurational Self-consistent Green's Functionmentioning

confidence: 99%

Quantum kinetic description of Coulomb effects in one-dimensional nanoscale transistors

Indlekofer

Knoch

Appenzeller³

2005

Phys. Rev. B

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“…It is clear from these figures that our simulations are successful in reproducing the main features of experiment. The discrepancy between the value of T * , and the cryostat temperature of 0.01 K, cannot be attributed to an inability to cool the electrons in the dot below 0.3 K. Later on in this review, we will discuss the observation of temperature-dependent resistance variations in these dots, which exhibit a consistent change at temperatures well below 0.05 K [38][39][40]. Another contribution to T * is from decoherence-induced broadening of the dot levels, and the magnitude of this effect is determined by the value of the phase-breaking time (τ φ ).…”

Section: Experimental Signatures Of the Open-dot Spectrummentioning

confidence: 99%

“…Based on studies of the temperature-dependent behaviour in several different devices, we have suggested that the initial increase of the dot resistance with decreasing temperature is The dashed lines are fits to the form of equation ( 10) while the dotted line area fits to equation (10) with an additional log term added. Figure adapted with permission from [40]. Copyright, American Institute of Physics (2002).…”

Section: Temperature-dependent Transport and The Signatures Of Intera...mentioning

confidence: 99%

Interference and interactions in open quantum dots

Bird¹,

Akis²,

Ferry³

et al. 2003

Rep. Prog. Phys.

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In this report, we review the results of our joint experimental and theoretical studies of electroninterference, and interaction, phenomena in open electron cavities known as quantum dots. The transport through these structures is shown to be heavily influenced by the remnants of their discrete density of states, elements of which remain resolved in spite of the strong coupling that exists between the cavity and its reservoirs. The experimental signatures of this density of states are discussed at length in this report, and are shown to be related to characteristic wavefunction scarring, involving a small number of classical orbits. A semiclassical analysis of this behaviour shows it to be related to the effect of dynamical tunnelling, in which electrons injected into the dot tunnel through classically forbidden regions of phase space, to access isolated regular orbits. The dynamical tunnelling gives rise to the formation of long-lived quasi-bound states in the open dots, and the many-body implications associated with electron charging at these resonances are also explored in this report.

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“…Quantitative expressions for the temperature dependence of interaction-introduced conductance fluctuations have been derived. A detailed comparison of experimental results with the predictions obtained from the peakedinteraction model can be found in [32].…”

Section: Discussionmentioning

confidence: 99%