General condition for realizing a collinear spin-orbit effective magnetic field in two-dimensional electron systems and its application to zinc-blende and wurtzite quantum wells

Kozulin, A. S.; Malyshev, A. I.

doi:10.1103/physrevb.99.035305

Cited by 7 publications

(4 citation statements)

References 50 publications

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“…Despite the extensive research, the investigation has usually been restricted to quantum wells grown along the [001], [110], or [111] direction [6,14,15,[21][22][23][24][25][26][27][28][29][30][31][32][33][34]. It is until recently that attention has been paid to a general crystal orientation [35][36][37]. It was found that the recovery of the SU(2) symmetry can be realized for some growth direction Miller indices, with consequences like the transition from weak anti-localization to weak localization [35] or lifetime enhancement of spin helices [38].…”

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear spin current response in anisotropic spin-orbit coupled systems

Muñoz-Santana¹,

Maytorena²

2023

Preprint

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Section: Introductionmentioning

confidence: 99%

Linear and nonlinear spin current response in anisotropic spin-orbit coupled systems

Muñoz-Santana¹,

Maytorena²

2023

Preprint

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“…Other experiments include the study of the optimal conditions to grow CdTe on a GaAs substrate oriented along [013] [43], and the proposal of sublattice reversal epitaxy on (113)B GaAs substrates as a method to realize the sign change of the second-order susceptibility in THz devices [44]. It is however, until recently that attention has been paid to a general crystal orientation [45][46][47]. It was found that the recovery of the SU(2) symmetry can be realized for some growth direction Miller indices, with consequences like the transition from weak anti-localization to weak localization [45] or lifetime enhancement of spin helices [48].…”

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear spin current response of anisotropic spin-orbit coupled systems

Muñoz-Santana,

Maytorena

2023

J. Phys.: Condens. Matter

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We calculate the linear and the second harmonic (SH) spin current response of two anisotropic systems with spin orbit (SO) interaction. General expressions of wide applicability for the these response functions are first derived for a generic two-band Hamiltonian. The first system is a two-dimensional (2D) electron gas in the presence of Rashba and k-linear Dresselhaus SO couplings. The calculations show how narrow or wide the response spectra can be, what is their overall shape and size, and frequency shiftings, depending on which crystal orientation is selected. The quantitative knowing of this makes possible a comparative study for several orientations which would allow to select a spectrum with particular characteristic. We find that vanishing linear and second order response tensors are achievable under SU(2) symmetry conditions, characterized by a collinear SO vector field. Additional conditions under which specific tensor components vanish are posible, without having such collinearity. Thus, a proper choice of the growth direction and SO strengths allows to select the polarization of the linear and SH spin currents according to the direction of flowing. The second system is an anisotropic 2D free electron gas with anisotropic Rashba interaction, which has been employed to study the optical conductivity of 2D puckered structures with anisotropic energy bands. The presence of mass anisotropy and an energy gap open several distinct scenarios for the allowed optical interband transitions, which manifest in the linear and SH response contrastingly. The linear response displays only out-of-plane spin polarized currents, while the SH spin currents flow with spin orientation lying parallel to the plane of the system strictly. The models illustrate the possibility of the nonlinear spin Hall effect in systems with SO interaction, under the presence or absence of time-reversal symmetry. The results suggest different ways to manipulate the linear and nonlinear optical generation of spin currents which could find spintronic applications.

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“…Recently, various studies on semiconductors for optoelectronic devices have been theoretically predicted on ZnO-wz [11,12,13] and GaN-wz [11,12,14]. On the other hand, producing two-dimensional (2D) structures in these materials in terms of surface and interface are increasingly in demand [15,16], which is expected to induce useful properties for spintronics applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thin Film Thickness on the Electronic Properties of Wurtzite Structure (ZnO and GaN): A Density Functional Theory Study

Darajat

Absor

2021

KEM

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By using first-principle density-functional theory (DFT) calculations supplemented with symmetry analysis, we investigated the effect of thin-film thickness on the electronic properties of non-polar ( ZnO-wz and GaN-wz. We find that the electronic band structures of thin-film non-polar ( surface with layer variations from two until ten bilayers show the Rashba spin splitting. Importantly, we revealed that this splitting is found to be strongly anisotropic observed in the valence band maximum (VBM) around the Γ point. We clarified the origin of the anisotropic spin splitting in the electronic band structures by considering the point-group symmetry (PGS) of the present system. We found that the changes of the PGS from C6v (for polar [0001] direction) to Cs (for non-polar ( direction) are responsible for inducing the anisotropic of the spin splitting. To further confirm the anisotropic splitting, we calculated the Rashba spin splitting parameters for different directions of the k-path. We found that these parameters are different in magnitude for a different direction of the k-path indicating the anisotropic spin splitting quantitatively, which is consistent well with symmetry analysis. Finally, we conclude that the observed Rashba spin splitting in the wurtzite surface structure is promising for spintronics applications.

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General condition for realizing a collinear spin-orbit effective magnetic field in two-dimensional electron systems and its application to zinc-blende and wurtzite quantum wells

Cited by 7 publications

References 50 publications

Linear and nonlinear spin current response in anisotropic spin-orbit coupled systems

Linear and nonlinear spin current response in anisotropic spin-orbit coupled systems

Linear and nonlinear spin current response of anisotropic spin-orbit coupled systems

Effect of Thin Film Thickness on the Electronic Properties of Wurtzite Structure (ZnO and GaN): A Density Functional Theory Study

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