Graphene: Junctions and STM Spectra

TL;DR

This review explores how graphene's Dirac quasiparticles influence superconducting junction transport, magnetic impurity effects, and STM spectra, highlighting unique tunable phenomena due to graphene's electronic properties.

Contribution

It provides a comprehensive analysis of transport, magnetic impurities, and STM spectra in graphene, emphasizing the effects of Dirac quasarticles and gate voltage tuning.

Findings

Transport across superconducting graphene junctions is affected by barrier thickness and gate voltage.

Kondo effect in graphene is unconventional and gate-tunable.

Impurity position influences STM spectra in doped graphene.

Abstract

In this review we focus on the effect of the Dirac nature of graphene quasiparticles on two separate aspects. The first of these involves transport across superconducting graphene junctions with barriers of thickness $d_0$ and arbitrary gate voltages $V_0$ applied across the barrier region. The second aspect involves study of the presence of localized magnetic impurities in graphene and we show that Kondo effect in graphene is unconventional and can be tuned by gate voltage. We also discuss scanning tunneling conductance spectra phenomenon for both doped and undoped graphene. We show that the position of the impurity on or in graphene plays a subtle role and affects the underlying physics of STM spectra in doped graphene.