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Electron Interactions and Gap Opening in Graphene Superlattices
Justin C. W. Song, Andrey V. Shytov, Leonid S. Levitov
We develop a theory of interaction effects in graphene superlattices, where tunable superlattice periodicity can be used as a knob to control the gap at the Dirac point. Applied to…
Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
Justin C. W. Song, Klaas J. Tielrooij, Frank H. L. Koppens +1
Photo-excitation in solids can trigger a cascade in which multiple particle-hole excitations are generated. We analyze the carrier multiplication cascade of impact excitation proce…
Energy-driven Drag at Charge Neutrality in Graphene
Justin C. W. Song, Leonid S. Levitov
Coulomb coupling between proximal layers in graphene heterostructures results in efficient energy transfer between the layers. We predict that, in the presence of correlated densit…