The spin response of chiral conductors to nonequilibrium electrical fluctuations remains largely unexplored. We develop a low-frequency semiclassical Boltzmann theory coupled to Gauss's law for a chiral metal with spin-orbit coupling of hedgehog type, treating impurity scattering beyond the conventional relaxation-time approximation. We first determine the quadratic response to a local ac current and its frequency dependence, and then show that zero-mean stationary current fluctuation and electric-field fluctuation near boundaries generate finite time-averaged spin polarizations in the two boundary regions of the chiral metal. The polarizations are normal to the boundaries and antiparallel: for one chirality they point inward at both boundaries, and for the other they point outward. Within this model, the dominant contribution arises from the linear Edelstein effect driven by a quadratic effective electric field localized near each boundary. This picture may provide a qualitative explanation for CISS-related spin polarization reported in the absence of an applied bias. More broadly, we expect other externally maintained stochastic drives to induce spin polarization through the same mechanism.
We study the effects of impurity scattering on the nonlinear Hall response of Weyl semimetals within the semiclassical Boltzmann approach. We derive the rectified and second-harmonic conductivity tensors for a general momentum-dependent transport relaxation time and evaluate this quantity microscopically for short-rang...
J. A. Cañas, Daniel A. Bonilla, A. Martín-Ruiz· 0 citations
We study how a minimal length can affect the chiral vortical effect, in which rotation produces a current in matter made of chiral fermions. We focus on an isotropic modification of the momentum-space density of state (DoS) and determine the vortical conductivity from the static, long-wavelength correlation between the...
S. Mir, B. Pourhassan, Nawal H. Siddig et al.· The European Physical Journa...· 0 citations
We theoretically study dc electric currents induced by rapid spin precession in noncentrosymmetric magnetic Weyl semimetals using the Floquet--Keldysh Green's-function formalism. The spin dynamics act as a time-dependent chiral gauge field and the geometric structure of electric currents is expressed in terms of the Be...
Kota Watanabe, A. Ozawa, H. Ishizuka et al.· 0 citations
Electric toroidal dipoles (ETDs) characterize ferroaxial order, yet their bulk definition in periodic crystals has remained elusive because conventional multipole operators involve the ill-defined position operator. Here we formulate a thermodynamic ETD by coupling a spatially varying electric field to the relativistic...
We study how the transport window and environmental reinjection determine the spin polarization transmitted through a minimal two-leg chiral ladder. The model contains time-reversal-invariant helical spin--orbit coupling, spin-independent interchain hopping, and nonmagnetic contacts with two orbital modes per lead. Sub...
H. D.T.Verrilli, Jorge Cardenas-Gamboa, Mayra Peralta et al.· 0 citations
For two decades, the origin of Chirality-Induced Spin Selectivity (CISS), the spin polarization of electrons by nonmagnetic chiral systems without magnetic fields, has remained unsettled. Here, we establish a single exact rule defining the fundamental conditions for the effect: in nonmagnetic, time-reversal-invariant c...
S. Acharya, M. van Schilfgaarde· 1 citation
We use cookies to run the site and, with your consent, for analytics and to show ads.
See our Cookie Policy.
