Evidence of Lifshitz transition in thermoelectric power of ultrahigh mobility bilayer graphene

Understand

Resolving low-energy features in the density of states (DOS) holds the key to understanding wide variety of rich novel phenomena in graphene based 2D heterostructures.

• Lifshitz transition in bilayer graphene (BLG) arising from trigonal warping has been established theoretically and experimentally.
• Nevertheless, the experimental realization of its effects on the transport properties has been challenging because of its relatively low energy scale ($\sim 1$ meV).
• In this work, we demonstrate that the thermoelectric power (TEP) can be used as an effective probe to investigate fine changes in the DOS of BLG.