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Pumped double quantum dot with spin-orbit coupling.

Khomitsky D, Sherman E - Nanoscale Res Lett (2011)

Bottom Line: Two types of external perturbation are considered: a periodic field at the Zeeman frequency and a single half-period pulse.Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin- dependent probability density distribution.Both the interdot tunneling and the driven motion contribute into the spin evolution.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physical Chemistry, Universidad del País Vasco, 48080 Bilbao, Spain. evgeny_sherman@ehu.es.

ABSTRACT
We study driven by an external electric field quantum orbital and spin dynamics of electron in a one-dimensional double quantum dot with spin-orbit coupling. Two types of external perturbation are considered: a periodic field at the Zeeman frequency and a single half-period pulse. Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin- dependent probability density distribution. Both the interdot tunneling and the driven motion contribute into the spin evolution. These results can be important for the design of the spin manipulation schemes in semiconductor nanostructures.PACS numbers: 73.63.Kv,72.25.Dc,72.25.Pn.

No MeSH data available.


A schematic plot of the double-well potential described by Equation (1). Double green (red) lines correspond to the spin-split even (odd) tunneling-determined orbital states.
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Figure 1: A schematic plot of the double-well potential described by Equation (1). Double green (red) lines correspond to the spin-split even (odd) tunneling-determined orbital states.

Mentions: where the minima located at d and -d are separated by a barrier of height U0, as shown in Figure 1. We assume that the interminima tunneling is sufficiently weak such that the ground state can be described with a high accuracy as even linear combination of the oscillator states with a certain "harmonic" frequency ω0 located near the minima. The double quantum dot is located in a static magnetic field Bz along the z-axis and is driven by an external electric field ℰ(t) parallel to the x-axis. The full Hamiltonian , where the time-independent parts are given by(2)(3)


Pumped double quantum dot with spin-orbit coupling.

Khomitsky D, Sherman E - Nanoscale Res Lett (2011)

A schematic plot of the double-well potential described by Equation (1). Double green (red) lines correspond to the spin-split even (odd) tunneling-determined orbital states.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211269&req=5

Figure 1: A schematic plot of the double-well potential described by Equation (1). Double green (red) lines correspond to the spin-split even (odd) tunneling-determined orbital states.
Mentions: where the minima located at d and -d are separated by a barrier of height U0, as shown in Figure 1. We assume that the interminima tunneling is sufficiently weak such that the ground state can be described with a high accuracy as even linear combination of the oscillator states with a certain "harmonic" frequency ω0 located near the minima. The double quantum dot is located in a static magnetic field Bz along the z-axis and is driven by an external electric field ℰ(t) parallel to the x-axis. The full Hamiltonian , where the time-independent parts are given by(2)(3)

Bottom Line: Two types of external perturbation are considered: a periodic field at the Zeeman frequency and a single half-period pulse.Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin- dependent probability density distribution.Both the interdot tunneling and the driven motion contribute into the spin evolution.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physical Chemistry, Universidad del País Vasco, 48080 Bilbao, Spain. evgeny_sherman@ehu.es.

ABSTRACT
We study driven by an external electric field quantum orbital and spin dynamics of electron in a one-dimensional double quantum dot with spin-orbit coupling. Two types of external perturbation are considered: a periodic field at the Zeeman frequency and a single half-period pulse. Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin- dependent probability density distribution. Both the interdot tunneling and the driven motion contribute into the spin evolution. These results can be important for the design of the spin manipulation schemes in semiconductor nanostructures.PACS numbers: 73.63.Kv,72.25.Dc,72.25.Pn.

No MeSH data available.