نتایج جستجو برای: double quantum dot

تعداد نتایج: 541709  

2008
Akira Oguri

Abstract. We study transport through a double quantum dot with interdot hopping t, intradot repulsion U and interdot repulsion U ′, using the numerical renormalization group (NRG) method. At half-filling, the conductances in two-terminal series and four-terminal parallel configuration are calculated via two phase shifts for quasi-particles of double quantum dot connected to two noninteracting l...

2013
Sebastian Pfaller Andrea Donarini Milena Grifoni

We present a microscopic theory of transport through quantum dot setups coupled to superconducting leads. We derive a master equation for the reduced density matrix to lowest order in the tunneling Hamiltonian and focus on quasiparticle tunneling. For high enough temperatures transport occurs in the subgap region due to thermally excited quasiparticles, which can be used to observe excited stat...

2013
Kwanghyun Kim Myeong-Jong Kim Sun-I Kim Ji-Hyun Jang

We report pronounced enhancement of photoelectrochemical hydrogen generation of a quantum dot-sensitized hybrid-TiO2 (QD/H-TiO2) electrode that is composed of a mesoporous TiO2 layer sandwiched by a double sided energy harvesting layer consisting of a surface-textured TiO2 inverse opals layer on the bottom and a patterned mesoporous TiO2 layer on the top. CdSe/H-TiO2 exhibits a maximum photocur...

2000
L. P. Rokhinson L. J. Guo S. Y. Chou D. C. Tsui

We studied transport through ultrasmall Si quantum-dot transistors fabricated from siliconon-insulator wafers. At high temperatures, 4,T,100 K, the devices show single-electron or single-hole transport through the lithographically defined dot. At T,4 K, current through the devices is characterized by multidot transport. From the analysis of the transport in samples with double-dot characteristi...

2009
J. L. Movilla A. Ballester J. Planelles

Spatial and dielectric confinement modulations of the spontaneous emission rates, transition energies, and charge-density distributions of a singly ionized double donor system D2 + in a spherical quantum dot are calculated within the framework of the effective-mass envelope function approximation. Dipole moments, energy splittings, transition moments, electron-density distributions, and spontan...

2008
A. W. Holleitner C. R. Decker K. Eberl R. H. Blick

We define two laterally gated small quantum dots (∼ 15 electrons) in an Aharonov-Bohm geometry in which the coupling between the two dots can be broadly changed. For weakly coupled quantum dots we find Aharonov-Bohm oscillations. In an intermediate coupling regime we concentrate on the molecular states of the double dot and extract the magnetic field dependence of the coherent coupling.

1999
S. Bandyopadhyay

Quantum measurement theory is a perplexing discipline fraught with paradoxes and dichotomies. Here we discuss a gedanken experiment that uses a popular testbed namely, a coupled double quantum dot system to revisit intriguing questions about the collapse of wavefunctions, irreversibility, objective reality and the actualization of a measurement outcome. Corresponding author. E-mail: bandy@quant...

Journal: :Physical review letters 2009
Gou Shinkai Toshiaki Hayashi Takeshi Ota Toshimasa Fujisawa

We study coherent dynamics of two spatially separated electrons in a coupled semiconductor double quantum dot (DQD). Coherent oscillations in one DQD are strongly influenced by electronic states of the other DQD, or the two electrons simultaneously tunnel in a correlated manner. The observed coherent oscillations are interpreted as various two-qubit operations. The results encourage searching q...

2014
Wen-Xing Yang Ai-Xi Chen Hao Guo Yanfeng Bai

We propose a theoretical scheme to coherently control the transport of a single electron in an asymmetric double-quantum-dot system. The single-electron transport originates from the intrinsic interplay between the externally applied few-cycle pulse and the inter-dot tunneling. Solving the equations of motion for dot-density matrix, we reveal numerically that the current exhibits a significant ...

2012
NANCY SANDLER LUIS DIAS DA SILVA Luis Dias da Silva

Submitted for the MAR08 Meeting of The American Physical Society Finite-temperature conductance signatures of a quantum-critical transition in a double quantum-dot device1 NANCY SANDLER, Ohio University, LUIS DIAS DA SILVA, Oak Ridge Natl. Lab. and U. of Tennessee, KEVIN INGERSENT, U. of Florida, SERGIO ULLOA, Ohio University — We present conductance results for a quantum-dot system containing ...

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