Level structure and spin-orbit effects in quasi-one-dimensional semiconductor nanostructures

Romano, C. L.; Ulloa, Sergio E.; Tamborenea, P. I.

doi:10.1103/physrevb.71.035336

Cited by 28 publications

(22 citation statements)

References 34 publications

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“…29 Motivated by this earlier proposal and its potential impact on semiconductor spintronics, many researchers are actively investigating spin-orbitrelated physics in a variety of semiconductor nanostructures. 30,31,[34][35][36][37][38][39][40][41][42][43][44][45] Here we extend our previous investigation on the coherent SO control of entangled and spin-polarized electrons and their shot noise for transport in a beam-splitter configuration ͑Fig. 1͒ with local spin-orbit interactions, i.e., interactions acting within only a finite region of one of the two onedimensional incoming leads.…”

Section: Introductionsupporting

confidence: 56%

Shot noise and spin-orbit coherent control of entangled and spin-polarized electrons

et al. 2005

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We extend our previous work on shot noise for entangled and spin polarized electrons in a beam-splitter geometry with spin-orbit ͑SO͒ interaction in one of the incoming leads ͑lead 1͒. In addition to accounting for both the Dresselhaus and the Rashba spin-orbit terms, we present general formulas for the shot noise of singlet and triplets states derived within the scattering approach. We determine the full scattering matrix of the system for the case of leads with two orbital channels coupled via weak SO interactions inducing channel anticrossings. We show that this interband coupling coherently transfers electrons between the channels and gives rise to an additional modulation angle-dependent on both the Rashba and Dresselhaus interaction strengthswhich allows for further independent coherent control of the electrons traversing the incoming leads. We derive explicit shot noise formulas for a variety of correlated pairs ͑e.g., Bell states͒ and lead spin polarizations. Interestingly, the singlet and each of the triplets defined along the quantization axis perpendicular to lead 1 ͑with the local SO interaction͒ and in the plane of the beam splitter display distinctive shot noise for injection energies near the channel anticrossings; hence, one can tell apart all the triplets, in addition to the singlet, through noise measurements. We also find that spin-orbit induced backscattering within lead 1 reduces the visibility of the noise oscillations, due to the additional partition noise in this lead. Finally, we consider injection of two-particle wavepackets into leads with multiple discrete states and find that two-particle entanglement can still be observed via noise bunching and antibunching.

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Section: Introductionsupporting

confidence: 56%

Shot noise and spin-orbit coherent control of entangled and spin-polarized electrons

et al. 2005

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“…The nanorod width ͑cross section͒ is roughly ten times smaller than the dots' length. Introducing a weak magnetic field in the z direction that breaks the spin degeneracy ͑but produces no significant diamagnetic shift͒, the Hamiltonian takes the form 35,37,38 …”

Section: Quantum Dot System and Relaxation Ratesmentioning

confidence: 99%

“…[30][31][32][33][34] We have recently studied the electronic states of such quasi-1D double dots, and analyzed their spinmixed character, which arises from the spin-orbit ͑SO͒ interaction. 35 An interesting and potentially useful characteristic of these QD structures is that they can be designed so that only the Rashba or the Dresselhaus spin-orbit couplings are present in a given structure. 35 Therefore, they lend themselves ideally to the experimental study of the individual spin-orbit couplings, which is a desirable feature in quantum dot systems.…”

Section: Introductionmentioning

confidence: 99%

“…35 An interesting and potentially useful characteristic of these QD structures is that they can be designed so that only the Rashba or the Dresselhaus spin-orbit couplings are present in a given structure. 35 Therefore, they lend themselves ideally to the experimental study of the individual spin-orbit couplings, which is a desirable feature in quantum dot systems. 22 In this paper, we calculate rates of spin-flip transitions induced by phonon scattering between Rashba spin-mixed states, taking into account the different acoustic-phonon modes present in zinc-blende semiconductors.…”

Section: Introductionmentioning

confidence: 99%

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Spin relaxation rates in quasi-one-dimensional coupled quantum dots

2006

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We study theoretically the spin relaxation rate in quasi-one-dimensional coupled double semiconductor quantum dots. We consider InSb and GaAs-based systems in the presence of the Rashba spin-orbit interaction, which causes mixing of opposite-spin states, and allows phonon-mediated transitions between energy eigenstates. Contributions from all phonon modes and coupling mechanisms in zincblende semiconductors are taken into account. The spin relaxation rate is shown to display a sharp, cusp-like maximum as function of the interdot-barrier width, at a value of the width which can be controlled by an external magnetic field. This remarkable behavior is associated with the symmetric-antisymmetric level splitting in the structure.Comment: 4 figures, Submitted to Applied Physics Letter

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“…It has been shown that the average values of @ q V q are in the order of meV/Å [25]. Taking into account the values of g R for different semiconductors, the value of a q can vary in the range of a few meVnm to a few tens meVnm in low dimensional systems [25][26][27].…”

Section: Modelingmentioning

confidence: 99%

Ballistic transport through a semiconducting magnetic nanocontact in the presence of Rashba and Dresselhaus spin–orbit interactions

Fallahi

Ghanaatshoar

2012

Physica Status Solidi (b)

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We study the magnetoresistance (MR) of a one-dimensional electron gas in a ferromagnetic semiconducting nanocontact containing an atomic-size domain wall, and in the presence of the Rashba and the Dresselhaus spin-orbit interactions. The MR is calculated in the ballistic regime, within the LandauerBüttiker formalism. It is shown that, the Dresselhaus spin-orbit interaction which is the result of bulk-induced inversion asymmetry makes a reduction in the domain wall MR. In contrast, the Rashba coupling may lead to a negative or positive change in the domain wall MR, depending on the Fermi energy and the lateral confinement potentials which can be induced by both parabolic lateral confinement and lateral gate potentials.

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Level structure and spin-orbit effects in quasi-one-dimensional semiconductor nanostructures

Cited by 28 publications

References 34 publications

Shot noise and spin-orbit coherent control of entangled and spin-polarized electrons

Shot noise and spin-orbit coherent control of entangled and spin-polarized electrons

Spin relaxation rates in quasi-one-dimensional coupled quantum dots

Ballistic transport through a semiconducting magnetic nanocontact in the presence of Rashba and Dresselhaus spin–orbit interactions

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