Electric-field induced spin textures in a superlattice with Rashba and Dresselhaus spin-orbit coupling

Spin-orbit coupling plays an important role in various properties of very different materials. Moreover efforts are underway to control the degree and quality of spin-orbit coupling in materials with a concomitant control of transport properties. We calculate the frequency dependent optical conductivity in systems with both Rashba and Dresselhaus spin-orbit coupling. We find that when the linear Dresselhaus spin-orbit coupling is tuned to be equal to the Rashba spin-orbit coupling, the interband optical conductivity disappears. This is taken to be the signature of the recovery of SU(2) symmetry. The presence of the cubic Dresselhaus spin-orbit coupling modifies the dispersion relation of the charge carriers and the velocity operator. Thus the conductivity is modified, but the interband contribution remains suppressed at most but not all photon energies for a cubic coupling of reasonable magnitude. Hence, such a measurement can serve as a diagnostic probe of engineered spin-orbit coupling.

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“…( 1) and shows a more complex spin arrangement. Spin textures have been the subject of many recent studies [30][31][32][33]36]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Vanishing of interband light absorption in a persistent spin helix state

Zhou

Marsiglio

Ćarbotte

2013

Sci Rep

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“…It is interesting to ask, when nontrivial SOC is presented in the KP model, whether the resulting spinorbital superlattice model is still exactly solvable and what are the consequences. The energy spectrum [21][22][23], * ruili@ysu.edu.cn the optical properties [24,25], and the transport properties [26][27][28] of various spin-orbital superlattice models have received considerable attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Energy spectrum, the spin polarization, and the optical selection rules of the Kronig-Penney superlattice model with spin-orbit coupling

2018

Phys. Rev. B

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The Kronig-Penney model, an exactly solvable one-dimensional model of crystal in solid physics, shows how the allowed and forbidden bands are formed in solids. In this paper, we study this model in the presence of both strong spin-orbit coupling and the Zeeman field. We analytically obtain four transcendental equations that represent an implicit relation between the energy and the Bloch wavevector. Solving these four transcendental equations, we obtain the spin-orbital bands exactly. In addition to the usual band gap opened at the boundary of the Brillouin zone, a much larger spinorbital band gap is also opened at some special sites inside the Brillouin zone. The x-component of the spin-polarization vector is an even function of the Bloch wavevector, while the z-component of the spin-polarization vector is an odd function of the Bloch wavevector. At the band edges, the optical transition rates between adjacent bands are nonzero.

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“…The breaking of inversion symmetry leads to the Rashba and Dresselhaus SOCs, accordingly, the point symmetry changes to be C 4z . Considering the system is Q1D, the cubic-term Dresselhaus SOC can be ignored and only the linear-term Dresselhaus is involved, then the SOC Hamiltonian is written as [29][30][31][32]:…”

Section: Model and Formulationmentioning

confidence: 99%

Polaron induced local spin texture and anomalous Hall effect in the quadrilateral prism-shaped nanotube with Rashba and Dresselhaus spin–orbit coupling

Zhang

Pan

Zhu

et al. 2023

J. Phys.: Condens. Matter

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We theoretically study the spin-texture dynamics and the transverse asymmetric charge deflection induced by the polaron in a quadrilateral prism-shaped nanotube with the Rashba and Dresselhaus spin-orbit coupling (SOC). We reveal the polaron gives rise to the nontrivial local spin textures in the nanotube within the cross section plane. The spins demonstrate oscillations and the oscillating patterns are dependent on the SOC type. For the nanotube containing a segment of the ferromagnetic domain, the sizable asymmetric charge deflections could additionally take place, namely, the anomalous Hall effect. The amount of the deflected charges is determined by the strength and orientations of the ferromagnetic magnetization as well as the SOC type. The work provides a valuable insight of the coherent transport of polaron through a quasi-one-dimensional nanotube with Rashba and Dresselhaus SOC and open avenues for the potential device applications.

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Electric-field induced spin textures in a superlattice with Rashba and Dresselhaus spin-orbit coupling

Cited by 27 publications

References 44 publications

Vanishing of interband light absorption in a persistent spin helix state

Vanishing of interband light absorption in a persistent spin helix state

Energy spectrum, the spin polarization, and the optical selection rules of the Kronig-Penney superlattice model with spin-orbit coupling

Polaron induced local spin texture and anomalous Hall effect in the quadrilateral prism-shaped nanotube with Rashba and Dresselhaus spin–orbit coupling

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