Giant Nernst-Ettingshausen oscillations in Semiclassically strong magnetic fields

TL;DR

This paper investigates giant oscillations in the Nernst-Ettingshausen effect in strong magnetic fields for quasi-2D systems, explaining experimental observations in materials like graphene, graphite, and bismuth.

Contribution

It provides an exact description of NE oscillations in 2D systems and analyzes how these oscillations change with dimensional crossover and carrier type.

Findings

Giant NE oscillations are coherent with experimental data in graphene, graphite, and bismuth.

Oscillation magnitude varies with Fermi energy for different carrier types.

Oscillation phase, amplitude, and symmetry change during 3D crossover.

Abstract

We consider the Nernst-Ettingshausen (NE) effect in the presence of semiclassically strong magnetic fields for a quasi-two dimensional system with a parabolic or linear dispersion of carriers. We show that the occurring giant oscillations of the NE coefficient are coherent with the recent experimental observation in graphene, graphite and bismuth. In the 2D case we find the exact shape of these oscillations and show that their magnitude decreases/increases with enhancement of the Fermi energy for Dirac fermions/normal carriers. With a crossover to 3D spectrum the phase of oscillations shifts, their amplitude decreases and the peaks become asymmetric.