Mapping the Fermi velocity in the quasi-2D organic conductor k-(BEDT-TTF)2I3

TL;DR

This paper introduces a novel microwave resonance technique to map the Fermi velocity in quasi-2D organic conductors, demonstrated on k-(BEDT-TTF)2I3, providing a new way to probe electronic properties in layered materials.

Contribution

A new method using angle-dependent microwave resonance to determine the Fermi velocity in Q2D organic conductors is developed and demonstrated.

Findings

Successfully mapped the Fermi velocity in k-(BEDT-TTF)2I3.

The resonance frequency correlates with the extremal Fermi velocity.

Method applicable to other layered conductors.

Abstract

We demonstrate a new method for determining the Fermi velocity in quasi-two-dimensional (Q2D) organic conductors. Application of a magnetic field parallel to the conducting layers results in periodic open orbit quasiparticle trajectories along the Q2D Fermi surface. Averaging of this motion over the Fermi surface leads to a resonance in the interlayer microwave conductivity. The resonance frequency is simply related to the extremal value of the Fermi velocity perpendicular to the applied field. Thus, angle dependent microwave studies enable a complete mapping of the Fermi velocity. We illustrate the applicability of this method for the highly-2D organic conductor k-(BEDT-TTF)2I3.