Current Rectification by Pauli Exclusion in a Weakly Coupled Double Quantum Dot System

Ono, Ken; Austing, D. G.; Tokura, Y.; Tarucha, Seigo

doi:10.1126/science.1070958

Cited by 776 publications

(881 citation statements)

References 18 publications

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“…We explore high-bias magneto-transport properties of a ptype AlGaAs/GaAs DQD [10]. Charge detection is used to tune the DQD to the two-hole regime, where certain tunneling transitions requiring spin flips are subject to Pauli spin blockade [11]. In our device this blockade is absent.…”

mentioning

confidence: 99%

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

et al. 2017

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confidence: 99%

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

et al. 2017

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“…2,3 Various DQDs have been realized using semiconductor heterostructures. [2][3][4][5][6][7][8][9] In recent years, DQDs defined in InAs nanowires have attracted great attention, [10][11][12] because the nanowires possess a small electron effective mass, a large electron Landé g factor, strong spinorbit interaction, and strong radial confinement to elelctrons. [13][14][15] Apparently, high crystal quality along an entire nanowire is indispensably desired to precisely define a DQD and thus a spin qubit in the nanowire.…”

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confidence: 99%

Measurements of the spin-orbit interaction and Landé g factor in a pure-phase InAs nanowire double quantum dot in the Pauli spin-blockade regime

Wang

Huang

Lei

et al. 2016

Applied Physics Letters

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We demonstrate direct measurements of the spin-orbit interaction and Landé g factors in a semiconductor nanowire double quantum dot. The device is made from a single-crystal purephase InAs nanowire on top of an array of finger gates on a Si/SiO2 substrate and the measurements are performed in the Pauli spin-blockade regime. It is found that the double quantum dot exhibits a large singlet-triplet energy splitting of ΔST ~2.3 meV, a strong spinorbit interaction of ΔSO ~140 eV, and a large and strongly level-dependent Landé g factor of ~12.5. These results imply that single-crystal pure-phase InAs nanowires are desired semiconductor nanostructures for applications in quantum information technologies.

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“…Such a device is also a useful tool for studying the fundamental physics of openquantum systems in non-equilibrium, where the leads play the role of an environment [6]. Modeling transport through such nanoscale systems is a complicated task, especially when strong Coulomb interaction is present in the quantum dots, as it can lead to phenomena like Coulomb blockade [7,8], Kondo effect [9,10,11], or Pauli blockade [12], just to mention a few. Quantum transport can be calculated using different theoretical methods like scatteringstates numerical-renormalization group [13], non-equilibrium Green's functions [14,15], and master equation based approaches [6,16,17,18,19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

QmeQ 1.0: An open-source Python package for calculations of transport through quantum dot devices

Wacker

Pedersen

Karlström

et al. 2017

Computer Physics Communications

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QmeQ is an open-source Python package for numerical modeling of transport through quantum dot devices with strong electron-electron interactions using various approximate master equation approaches. The package provides a framework for calculating stationary particle or energy currents driven by differences in chemical potentials or temperatures between the leads which are tunnel coupled to the quantum dots. The electronic structures of the quantum dots are described by their single-particle states and the Coulomb matrix elements between the states. When transport is treated perturbatively to lowest order in the tunneling couplings, the possible approaches are Pauli (classical), firstorder Redfield, and first-order von Neumann master equations, and a particular form of the Lindblad equation. When all processes involving two-particle excitations in the leads are of interest, the second-order von Neumann approach can be applied. All these approaches are implemented in QmeQ. We here give an overview of the basic structure of the package, give examples of transport calculations, and outline the range of applicability of the different approximate approaches. Keywords: Open quantum systems, Quantum dots, Anderson-type model, Coulomb blockade, Python Program summaryProgram Title: QmeQ Licensing provisions: BSD 2-Clause Programming language: Python External libraries: NumPy, SciPy, Cython Nature of problem: Calculation of stationary state currents through quantum dots tunnel coupled to leads. Solution method: Exact diagonalisation of the quantum dot Hamiltonian for a given set of single particle states and Coulomb matrix elements. Numerical solution of the stationary-state master equation for a given approximate approach. Restrictions: Depending on the approximate approach the temperature needs to be sufficiently large compared to the coupling strength for the approach to be valid.

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Current Rectification by Pauli Exclusion in a Weakly Coupled Double Quantum Dot System

Cited by 776 publications

References 18 publications

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

Measurements of the spin-orbit interaction and Landé g factor in a pure-phase InAs nanowire double quantum dot in the Pauli spin-blockade regime

QmeQ 1.0: An open-source Python package for calculations of transport through quantum dot devices

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