The induced by an electromagnetic field coexistence of types I and II spectra in Weyl semimetals

Алисултанов, З. З.

doi:10.1038/s41598-018-32104-y

Cited by 4 publications

(2 citation statements)

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“…Strain profiles in these materials are likely to be inhomogeneous, generating pseudoelectromagnetic fields in the bulk, albeit with a lesser degree of control over other strain effects (see Box 1). In particular, a pseudo-electric field can over tilt the Weyl dispersion [108] (known as a Type-II Weyl node [109]) and induce a finite magnetization [110]. Second, it is plausible that by etching crystals into different geometries using lithography, used recently to discover the peculiar quantum oscillations mediated by Fermi arcs [62,111,112], can be used to strain samples in a controlled way .…”

Section: Experimental Realizations and Probesmentioning

confidence: 99%

Pseudo-electromagnetic fields in 3D topological semimetals

2019

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Dirac and Weyl semimetals, materials where electrons behave as relativistic fermions, react to position-and time-dependent perturbations, such as strain, as if emergent electromagnetic fields were applied. Since they differ from external electromagnetic fields in their symmetries and phenomenology they are called pseudo-electromagnetic fields, and enable a simple and unified description of a variety of inhomogeneous systems involving topological semimetals. We review the different physical ways to create effective pseudo-fields, their observable consequences as well as their similarities and differences compared to electromagnetic fields. Among these difference is their effect on quantum anomalies, the absence of a classical symmetry in the quantum theory, which we revisit from a quantum field theory and a semiclassical viewpoint. We conclude with predicted observable signatures of the pseudo-fields and the nascent experimental status. * All authors contributed equally to the preparation of this review arXiv:1903.11088v1 [cond-mat.mes-hall]

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Section: Experimental Realizations and Probesmentioning

confidence: 99%

Pseudo-electromagnetic fields in 3D topological semimetals

2019

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“…Let us now apply equation (24) to describe the relativistic mechanism of chiral transport. As shown above, the transverse electric field changes the velocity of the zero LL.…”

Section: Quasiclassical Chiral Kinetic Approachmentioning

confidence: 99%

Relativistic mechanism of chiral magnetic current in Weyl semimetals with tilted dispersion

Алисултанов¹

2019

J. Phys.: Condens. Matter

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The chiral magnetic effect is a one of the exotic bulk transport properties of the Weyl semimetals. Because of the Nielsen-Ninomiya "no-go theorem", the total chiral magnetic current is absent in the equilibrium state. One of the mechanisms for generating this current is the chiral anomaly. This phenomenon is the anomalous nonconservation of chiral charge for massless relativistic particles. It can be realized by parallel magnetic and electric fields (∼ E · B), and it leads to such new transport phenomenon as the negative longitudinal magnetoresistance. Using a simple theory (we consider both linearized and lattice model), we have shown, that in Weyl metals with tilted dispersion another mechanism of the chiral magnetic current is possible. It is not associated with the chiral anomaly. The new transport mechanism is based on the relativistic effect of electric field on Landau levels. This effect is that an electric field changes the distance between the Landau levels, and also changes the effective velocity along magnetic field. At presence of a tilt in the spectrum, this velocity renormalization is differ for different Weyl points. This leads to a non-zero resulting drift velocity. As a consequence, an electrical current arises along the magnetic field. The induced by this mechanism the electric current is proportional to the pseudoscalar product of the fields (E ∨ B) and directed along the magnetic field, that differs it from the Hall current (∼ E × B). At the same time, the conductivity corresponding to this transport mechanism does not depend on the scattering time like the Hall conductivity. Thus, we have proposed a new anomalous transport mechanism in the Weyl semimetal, which is not associated with the chiral anomaly. arXiv:1902.08941v2 [cond-mat.str-el]

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