Transport Spectroscopy on Bilayer Graphene

Abstract

The talk will introduce a non-local direct chemical potential measurement technique using double bilayer graphene heterostructures, which consist of two parallel bilayer graphene separated by a hexagonal boron nitride dielectric. The measured chemical potential vs density characteristics show signatures of electron-electron interactions and an electron hole asymmetry. The talk will then discuss quantum Hall (QH) effect in bilayer graphene, presenting spin-to-valley polarized phase transitions, interaction-driven negative compressibility, and novel QH phases, which are predicted to possess a coherent superposition of two different electronic states. Gate-tunable resonant tunneling and negative differential resistance in the interlayer current vs voltage characteristics will be also breifly addressed.