Shubnikov–de Haas Thermoelectric Field Oscillations in Layered Conductors in the Vicinity of a Topological Lifshits Transition

Journal Article · Thu Aug 15 00:00:00 EDT 2019 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776119080077· OSTI ID:22917691

Galbova, O. ^[1]; Yiasemides, K. ^[2]

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1. Institute of Physics, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University in Skopje (North Macedonia, Republic of)
2. University of West Attica (Greece)

We have studied the response of a layered conductor with a quasi-two-dimensional electron spectrum and a multisheet Fermi surface (FS) formed by two weakly corrugated cylinders and two planar sheets adjoining these cylinders to nonuniform heating. As a result of action of pressure on the conductor or its doping with impurity atoms, distance Δ{sub p} between the FS cylinder and planar sheets can be reduced to such an extent that conduction electrons begin roaming over these sheets, tunneling from one FS sheet (cavity) to the other. If a conduction electron can visit several times all FS sheets during its mean free time, its motion in the plane orthogonal to the magnetic field becomes finite. In this case, Shubnikov–de Haas oscillations are excited with a period determined by the closed area circumscribed by the electron during its motion in the magnetic-breakdown trajectory in the momentum space. We have calculated the dependence of the thermoelectric field on the magnitude and orientation of a quite strong quantizing magnetic field. In a magnetic field normal to the layers, the cross sections of the cylindrical part of the FS are equidistant from both FS planar sheets. However, this equidistance is violated even for a small deviation of the field from the normal to the layers by angle ϑ, and, at a certain value ϑ{sub k} of this angle, the probability of magnetic breakdown to one of the FS planar sheets can be so low that the electron cannot close the magnetic-breakdown trajectory, and its motion over the other planar sheet with a visit to the FS cylindrical part becomes infinite. In this case, the magnetic-breakdown quantum oscillations of magnetization and all kinetic characteristics of the conductor disappear, and their disappearance is repeated periodically with a change in the slope of the magnetic field to the layers as a function of tanϑ.

• OSTI ID: 22917691
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 129, Issue 2; Other Information: Copyright (c) 2019 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMS
CROSS SECTIONS
CYLINDRICAL CONFIGURATION
DISTANCE
ELECTRON SPECTRA
ELECTRONS
FERMI LEVEL
IMPURITIES
LAYERS
MAGNETIC FIELDS
MAGNETIZATION
OSCILLATIONS
PERIODICITY
PROBABILITY
SHUBNIKOV-DE HAAS EFFECT
SPACE
TOPOLOGY
TRAJECTORIES
TUNNEL EFFECT
TWO-DIMENSIONAL CALCULATIONS