Erratum: ac-Driven Double Quantum Dots as Spin Pumps and Spin Filters [Phys. Rev. Lett.<b>94</b>, 107202 (2005)]

Cota, E.; Aguado, Ramón; Platero, Gloria

doi:10.1103/physrevlett.94.229901

Cited by 66 publications

(90 citation statements)

References 1 publication

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“…Interestingly, it is predicted that for a suitable choice of the applied photon frequency, the resulting pumped current can have a large spin polarization ͑Cota et al, 2005; Pauli blockade has also been observed in lateral double dot systems. In these systems the tunnel rates and offset energies are easily tuned.…”

Section: Pauli Spin Blockadementioning

confidence: 99%

Spins in few-electron quantum dots

et al. 2007

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The canonical example of a quantum-mechanical two-level system is spin. The simplest picture of spin is a magnetic moment pointing up or down. The full quantum properties of spin become apparent in phenomena such as superpositions of spin states, entanglement among spins, and quantum measurements. Many of these phenomena have been observed in experiments performed on ensembles of particles with spin. Only in recent years have systems been realized in which individual electrons can be trapped and their quantum properties can be studied, thus avoiding unnecessary ensemble averaging. This review describes experiments performed with quantum dots, which are nanometer-scale boxes defined in a semiconductor host material. Quantum dots can hold a precise but tunable number of electron spins starting with 0, 1, 2, etc. Electrical contacts can be made for charge transport measurements and electrostatic gates can be used for controlling the dot potential. This system provides virtually full control over individual electrons. This new, enabling technology is stimulating research on individual spins. This review describes the physics of spins in quantum dots containing one or two electrons, from an experimentalist's viewpoint. Various methods for extracting spin properties from experiment are presented, restricted exclusively to electrical measurements. Furthermore, experimental techniques are discussed that allow for ͑1͒ the rotation of an electron spin into a superposition of up and down, ͑2͒ the measurement of the quantum state of an individual spin, and ͑3͒ the control of the interaction between two neighboring spins by the Heisenberg exchange interaction. Finally, the physics of the relevant relaxation and dephasing mechanisms is reviewed and experimental results are compared with theories for spin-orbit and hyperfine interactions. All these subjects are directly relevant for the fields of quantum information processing and spintronics with single spins ͑i.e., single spintronics͒.

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Section: Pauli Spin Blockadementioning

confidence: 99%

Spins in few-electron quantum dots

et al. 2007

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“…We believe that the higher bias features are an extension of the general idea developed here, which will be addressed in a future work. Let us now define the DQD Hamiltonian 17,19,20 in a localized orbital basis as…”

Section: A Electronic Structure Of a Double Quantum Dotmentioning

confidence: 99%

Generic model for current collapse in spin-blockaded transport

2007

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A decrease in current with increasing voltage, often referred to as negative differential resistance ͑NDR͒, has been observed in many electronic devices and can usually be understood within a one-electron picture. However, NDR has recently been reported in nanoscale devices with large single-electron charging energies which require a many-electron picture in Fock space. This paper presents a generic model in this transport regime leading to a simple criterion for the conditions required to observe NDR and shows that this model describes the recent observation of multiple NDR's in spin-blockaded transport through weakly coupled-double quantum dots quite well. This model clearly shows how a delicate interplay of orbital energy offset, delocalization, and Coulomb interaction leads to the observed NDR under the right conditions, and also aids in obtaining a good match with experimentally observed features. We believe that the basic model could be useful in understanding other experiments in this transport regime as well.

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“…Recently, the interest in including the effects of Coulomb interaction beyond the Hartree level to the problem of adiabatic pumping has arisen. 12,13,14,15,16,17,18,19,20 Spin-dependent transport through nanostructures has recently attracted a lot of interest. A model example is a quantum-dot spin valve, which consists of an interacting (single-level) quantum dot attached to two ferromagnetic leads (F-dot-F), see Fig.…”

Section: Introductionmentioning

confidence: 99%

Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads

2008

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We study adiabatic pumping of electrons through quantum dots attached to ferromagnetic leads. Hereby we make use of a real-time diagrammatic technique in the adiabatic limit that takes into account strong Coulomb interaction in the dot. We analyze the degree of spin polarization of electrons pumped from a ferromagnet through the dot to a nonmagnetic lead (N-dot-F) as well as the dependence of the pumped charge on the relative leads' magnetization orientations for a spinvalve (F-dot-F) structure. For the former case, we find that, depending on the relative coupling strength to the leads, spin and charge can, on average, be pumped in opposite directions. For the latter case, we find an angular dependence of the pumped charge, that becomes more and more anharmonic for large spin polarization in the leads.

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Erratum: ac-Driven Double Quantum Dots as Spin Pumps and Spin Filters [Phys. Rev. Lett.94, 107202 (2005)]

Cited by 66 publications

References 1 publication

Spins in few-electron quantum dots

Spins in few-electron quantum dots

Generic model for current collapse in spin-blockaded transport

Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads

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