Thermally induced spin polarization in a magnetized two-dimensional electron gas with Rashba spin-orbit interaction

Dyrdał, A.; Barnaś, J.; Dugaev, V. K.; Berakdar, Jamal

doi:10.1103/physrevb.98.075307

Cited by 13 publications

(16 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, despite the recent experimental observation of the spin Nernst effect [7][8][9][10] -the thermal counterpart of the spin Hall effect [12,13], the puzzle whether the Mott relation exists between these two effects has not been settled theoretically [14][15][16][17][18][19]. Besides, whether the Edelstein effects (nonequilibrium spin polarization) induced by the electric field [12,20] and by the temperature-gradient [21] are linked by the Mott relation is also a controversial issue [22,23].…”

mentioning

confidence: 99%

Berry Phase Effects in Dipole Density and the Mott Relation

et al. 2020

View full text Add to dashboard Cite

We provide a unified semiclassical approach for thermoelectric responses of any observable represented by an operatorθ that is well-defined in periodic crystals. The Mott relation is established, in the presence of Berry-phase effects, for various physical realizations ofθ in electronic systems, including the familiar case of the electric current as well as the currently controversial cases of the spin polarization and spin current. In our theory the dipole density of a physical quantity emerges and plays a vital role, which contains not only the statistical sum of the dipole moment ofθ but also a Berry-phase correction.

show abstract

mentioning

confidence: 99%

Berry Phase Effects in Dipole Density and the Mott Relation

et al. 2020

View full text Add to dashboard Cite

show abstract

“…According to the semiclassical Boltzmann theory, the susceptibility vanishes at zero temperature in a two-dimensional electron gas with the Rashba SOI 44,46 , where the Edelstein effect and its heat analog are allowed. On the other hand, in a Rashba ferromagnet, where both the Edelstein and ME effects as well as their heat analogs are allowed, the Kubo formula of the susceptibility resulted in an unphysical divergence at zero temperature owing to the Fermi-sea terms 47 . This result implies the failure of the Kubo formula for the heat analog of the ME effect and reminds us of the Nernst and thermal Hall effects.…”

Section: Introductionmentioning

confidence: 99%

Theory of spin magnetic quadrupole moment and temperature-gradient-induced magnetization

2019

View full text Add to dashboard Cite

We revisit a quantum-mechanical formula of the spin magnetic quadrupole moment (MQM) in periodic crystals. Two previous attempts were inconsistent with each other; one is gauge dependent, and the other is gauge invariant. Here we define the spin MQM by calculating the spin density in a nonuniform system. Our definition is analogous to that of the charge polarization, but the result is gauge invariant and coincides with the latter previous one. We also formulate what we call gravitomagnetoelectric (gravito-ME) effect, in which the magnetization is induced by a temperature gradient. Although the Kubo formula for the gravito-ME effect provides an unphysical divergence at zero temperature, we prove that the correct susceptibility is obtained by subtracting the spin MQM from the Kubo formula. It vanishes at zero temperature and is related to the ME susceptibility by the Mott relation. We explicitly calculate the gravito-ME susceptibility in a Rashba ferromagnet and show its experimental feasibility.

show abstract

“…The PAM due to temperature gradient can be measured through the rigid-body rotation or the phonon orbital magnetic moments, and the theoretical estimate for several realistic materials suggests these phenomena are detectable in experiments 57 . Temperature gradient can also drive electron spin polarization in spin-orbit-coupled systems [82][83][84] , which shows a different temperature dependence from Eq. ( 9) for PAM.…”

mentioning

confidence: 96%

Phonon helicity and Nieh-Yan Anomaly in the Kramers-Weyl semimetals of Chiral Crystals

Liu

2021

Preprint

View full text Add to dashboard Cite

Nieh-Yan anomaly describes the non-conservation of chiral charges induced by the coupling between Dirac fermions and torsion fields. Since the torsion field is beyond general relativity, this effect remains hypothetical and its relevance to our universe is unclear in the context of high-energy physics. In this work, we propose that the phonons can induce a torsion field for the Kramers-Weyl fermions through electron-phonon interaction in a non-magnetic chiral crystal, thus leading to the occurrence of the Nieh-Yan anomaly in this condensed matter system. As a consequence, the Nieh-Yan term can strongly influence the phonon dynamics and lead to the helicity of acoustic phonons, namely, two transverse phonon modes mix with each other to form a circular polarization with a non-zero angular momentum at a finite phonon momentum and the phonon angular momentum reverses its sign for opposite momenta due to time reversal symmetry. The phonon helicity can be probed through measuring the total phonon angular momentum driven by a temperature gradient.

show abstract

Thermally induced spin polarization in a magnetized two-dimensional electron gas with Rashba spin-orbit interaction

Cited by 13 publications

References 55 publications

Berry Phase Effects in Dipole Density and the Mott Relation

Berry Phase Effects in Dipole Density and the Mott Relation

Theory of spin magnetic quadrupole moment and temperature-gradient-induced magnetization

Phonon helicity and Nieh-Yan Anomaly in the Kramers-Weyl semimetals of Chiral Crystals

Contact Info

Product

Resources

About