Evolution of the persistent spin helix in the presence of Hartree-Fock fields

Lüffe, Matthias C.; Danon, Jeroen; Nunner, Tamara S.

doi:10.1103/physrevb.87.125416

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…Diffusion equations similar to Eqs. (33),(34) have, for various types of spin-orbit coupling and ingredients to the many-body physics, also been derived using different theoretical techniques (Bernevig and Hu, 2008;Burkov et al, 2004;Kalevich et al, 1994;Bryksin, 2007, 2009;Lüffe et al, 2013Lüffe et al, , 2011Schwab et al, 2006;Wenk and Kettemann, 2010;Yang et al, 2010).…”

Section: Spin Diffusion Equationsmentioning

confidence: 99%

“…Theoretical investigations by Lüffe et al (2013Lüffe et al ( , 2011) led to the prediction that the spin helix life time can be enhanced by Coulomb repulsion (treated there within Hartree-Fock approximation). A study of Rashba and Dresselhaus coupling and its interplay with Coulomb interaction described by the GW approximation was presented by Nechaev et al (2010).…”

Section: Stability Of the Spin Helix: Limiting Factorsmentioning

confidence: 99%

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Colloquium: Persistent spin textures in semiconductor nanostructures

2017

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Device concepts in semiconductor spintronics make long spin lifetimes desirable, and the requirements put on spin control by schemes of quantum information processing are even more demanding. Unfortunately, due to spin-orbit coupling electron spins in semiconductors are generically subject to rather fast decoherence. In two-dimensional quantum wells made of zinc-blende semiconductors, however, the spin-orbit interaction can be engineered in such a way that persistent spin structures with extraordinarily long spin lifetimes arise even in the presence of disorder and imperfections. We review experimental and theoretical developments on this subject both for n-doped and p-doped structures, and we discuss possible device applications.

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Section: Spin Diffusion Equationsmentioning

confidence: 99%

Section: Stability Of the Spin Helix: Limiting Factorsmentioning

confidence: 99%

Colloquium: Persistent spin textures in semiconductor nanostructures

2017

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“…As a consequence, the geometrical relations between the collinear and the symmetry-breaking part of the total SO field are complicated and the induced relaxation effect is sensitive to the orientation of the quantum well. Previous studies on the impact of the k-cubic Dresselhaus SO field on the stability of the PSH are restricted to the well-established cases of [001], 23,[28][29][30][31][32][33][34][35][36] [110], [37][38][39] and [111] 40 quantum wells.…”

Section: Introductionmentioning

confidence: 99%

Enhanced longevity of the spin helix in low-symmetry quantum wells

Iizasa,

Kohda,

Zülicke

et al. 2020

Preprint

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In a semiconductor, collective excitations of spin textures usually decay rather fast due to D'yakonov-Perel' spin relaxation. The latter arises from spin-orbit coupling, which induces wavevector (k) dependent spin rotations that, in conjunction with random disorder scattering, generate spin decoherence. However, symmetries occurring under certain conditions can prevent the relaxation of particular homogeneous and inhomogeneous spin textures. The inhomogeneous spin texture, termed as persistent spin helix, is especially appealing as it enables us to manipulate the spin orientation while retaining a long spin lifetime. Recently, it was predicted that such symmetries can be realized in zinc-blende two-dimensional electron gases if at least two growth-direction Miller indices agree in modulus and the coefficients of the Rashba and k-linear Dresselhaus spin-orbit couplings are suitably matched [Kammermeier et al., Phys. Rev. Lett. 117, 236801 (2016)]. In the present paper, we systematically analyze the impact of the symmetry-breaking k-cubic Dresselhaus spin-orbit coupling, which generically coexists in these systems, on the stability of the emerging spin helices with respect to the growth direction. We find that, as an interplay between orientation and strength of the effective magnetic field induced by the k-cubic Dresselhaus terms, the spin relaxation is weakest for a low-symmetry growth direction that can be well approximated by a [225] lattice vector. These quantum wells yield a 30% spin-helix lifetime enhancement compared to [001]-oriented electron gases and, remarkably, require a negligible Rashba coefficient. The rotation axis of the corresponding spin helix is only slightly tilted out of the quantum-well plane. This makes the experimental study of the spin helix dynamics readily accessible for conventional optical spin orientation measurements where spins are excited and detected along the quantum-well growth direction.

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“…Spin dynamics for Fermi gas with spinorbital coupling has been discussed in Refs. [30][31][32][33][34][35][36][37].…”

mentioning

confidence: 99%

Quantum Spin Dynamics in a Normal Bose Gas with Spin-Orbit Coupling

Tang

Zhang

2018

Phys. Rev. Lett.

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In this Letter, we investigate spin dynamics of a two-component Bose gas with spin-orbit coupling realised in cold atom experiments. We derive coupled hydrodynamic equations for number and spin densities as well as their associated currents. Specialising to quasi-one-dimensional situation, we obtain analytic solutions of the spin helix structure and its dynamics in both adiabatic and diabatic regimes. In the adiabatic regime, the transverse spin decays parabolically in the short-time limit and exponentially in the long time limit, depending on initial polarisation. In contrast, in the diabatic regime, transverse spin density and current oscillate in a way similar to the charge-current oscillation in an undamped LC circuit. The effects of Rabi coupling on the short-time spin dynamics is also discussed. Finally, using realistic experimental parameters for 87 Rb, we show that the time scales for spin dynamics is of order of milliseconds to a few seconds and can be observed experimentally. 1 2 g d 3 r :n(r)n(r) : where H µν is given by

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Evolution of the persistent spin helix in the presence of Hartree-Fock fields

Cited by 6 publications

References 23 publications

Colloquium: Persistent spin textures in semiconductor nanostructures

Colloquium: Persistent spin textures in semiconductor nanostructures

Enhanced longevity of the spin helix in low-symmetry quantum wells

Quantum Spin Dynamics in a Normal Bose Gas with Spin-Orbit Coupling

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