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Eto, Hajime

doi:10.1023/a:1014821012420

Cited by 19 publications

(11 citation statements)

References 11 publications

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“…This phenomenon has been predicted in earlier works by Eto et al 51,52 and is analogous to superradiant photon emission of atoms with uniform coupling to the optical field. 55,56 An alternative setup with unpolarized contacts has also been recently analyzed in Ref.…”

Section: -54supporting

confidence: 74%

“…To account for imperfectly-polarized ferromagnetic contacts, we allow for nuclear-spin states that are both partially polarized and fully dephased, as well as spin-flip tunneling processes allowing for spin flips in both directions. These aspects are not present in the superradiant-like transport in an ideal 'spin-blocked' regime discussed in previous literature 51,52,57 (in our case, for half-metal leads). These features are, however, generically relevant for most realistic setups.…”

mentioning

confidence: 46%

“…34,43,44 Due to the simplicity of this limit, there is a large relevant body of theoretical literature, addressing electron-spin dephasing, 43,45,46 as well as manipulation and entanglement generation/preservation for the electron-spin [47][48][49][50] or nuclear-spin system. [51][52][53][54] The inhomogeneous hyperfine coupling in current devices is due to the spatial dependence of the electronic arXiv:1503.03645v2 [cond-mat.mes-hall] 18 Jun 2015 wavefunction. For a bound state, this inhomogeneity is thus impossible to avoid in III-V materials (where all isotopes have a finite nuclear spin).…”

Section: Introductionmentioning

confidence: 99%

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Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve

Chesi

Coish

2015

Phys. Rev. B

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We have theoretically analyzed coherent nuclear-spin dynamics induced by electron transport through a quantum-dot spin valve. The hyperfine interaction between electron and nuclear spins in a quantum dot allows for the transfer of angular momentum from spin-polarized electrons injected from ferromagnetic or half-metal leads to the nuclear spin system under a finite voltage bias. Accounting for a local nuclear-spin dephasing process prevents the system from becoming stuck in collective dark states, allowing a large nuclear polarization to be built up in the long-time limit. After reaching a steady state, reversing the voltage bias induces a transient current response as the nuclear polarization is reversed. Long-range nuclear-spin coherence leads to a strong enhancement of spinflip transition rates (by an amount proportional to the number of nuclear spins) and is revealed by an intense current burst, analogous to superradiant light emission. The crossover to a regime with incoherent spin flips occurs on a relatively long time scale, on the order of the single-nuclearspin dephasing time, which can be much longer than the time scale for the superradiant current burst. This conclusion is confirmed through a general master equation. For the two limiting regimes (coherent/incoherent spin flips) the general master equation recovers our simpler treatment based on rate equations, but is also applicable at intermediate dephasing. Throughout this work we assume uniform hyperfine couplings, which yield the strongest coherent enhancement. We propose realistic strategies, based on isotopic modulation and wavefunction engineering in core-shell nanowires, to realize this analytically solvable "box-model" of hyperfine couplings.

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Section: -54supporting

confidence: 74%

mentioning

confidence: 46%

Section: Introductionmentioning

confidence: 99%

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Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve

Chesi

Coish

2015

Phys. Rev. B

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“…Models of this type were studied recently by Eto [33] and Semenov and Kim [34], see also [25]. The technical advantage of this type of model lies in the fact that the square of the total nuclear spin I tot = i I i is an additional conserved quantity, [H, I …”

Section: Ground State and Elementary Propertiesmentioning

confidence: 99%

Electron spin dynamics in quantum dots and related nanostructures due to hyperfine interaction with nuclei

Schliemann

Khaetskii

Loss

2003

J. Phys.: Condens. Matter

239

381

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We review and summarize recent theoretical and experimental work on electron spin dynamics in quantum dots and related nanostructures due to hyperfine interaction with surrounding nuclear spins. This topic is of particular interest with respect to several proposals for quantum information processing in solid state systems. Specifically, we investigate the hyperfine interaction of an electron spin confined in a quantum dot in an s-type conduction band with the nuclear spins in the dot. This interaction is proportional to the square modulus of the electron wavefunction at the location of each nucleus leading to an inhomogeneous coupling, i.e. nuclei in different locations are coupled with different strengths. In the case of an initially fully polarized nuclear spin system an exact analytical solution for the spin dynamics can be found. For not completely polarized nuclei, approximation-free results can only be obtained numerically in sufficiently small systems. We compare these exact results with findings from several approximation strategies.

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“…The OR field was chosen because some of us have some background in this field and because we have easy access to a number of OR experts who can help us with the evaluation of our results. We note that sometimes a distinction is made between OR on the one hand and management science on the other hand (e.g., Eto 2000, 2002). For our purpose, however, such a distinction is not important.…”

Section: Experimental Evaluationmentioning

confidence: 99%

Automatic term identification for bibliometric mapping

et al. 2010

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A term map is a map that visualizes the structure of a scientific field by showing the relations between important terms in the field. The terms shown in a term map are usually selected manually with the help of domain experts. Manual term selection has the disadvantages of being subjective and labor-intensive. To overcome these disadvantages, we propose a methodology for automatic term identification and we use this methodology to select the terms to be included in a term map. To evaluate the proposed methodology, we use it to construct a term map of the field of operations research. The quality of the map is assessed by a number of operations research experts. It turns out that in general the proposed methodology performs quite well.

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Cited by 19 publications

References 11 publications

Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve

Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve

Electron spin dynamics in quantum dots and related nanostructures due to hyperfine interaction with nuclei

Automatic term identification for bibliometric mapping

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