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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-excitation Cascade and Multiple Carrier Generation in Graphene
K. J. Tielrooij, J. C. W. Song, S. A. Jensen +6
The conversion of light into free electron-hole pairs constitutes the key process in the fields of photodetection and photovoltaics. The efficiency of this process depends on the c…
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…
Mapping Dirac Quasiparticles near a Single Coulomb Impurity on Graphene
Yang Wang, Victor W. Brar, Andrey V. Shytov +6
The response of Dirac fermions to a Coulomb potential is predicted to differ significantly from the behavior of non-relativistic electrons seen in traditional atomic and impurity s…
Evolution of Landau Levels into Edge States at an Atomically Sharp Edge in Graphene
Guohong Li, Adina Luican, Dmitry Abanin +2
The quantum-Hall-effect (QHE) occurs in topologically-ordered states of two-dimensional (2d) electron-systems in which an insulating bulk-state coexists with protected 1d conductin…