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Hot carrier transport and photocurrent response in graphene.
Strong electron-electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on… Expand
Hot Carrier–Assisted Intrinsic Photoresponse in Graphene
Photoexcited electrons in graphene remain thermally excited because they cannot transfer this energy to lattice vibrations. We report on the intrinsic optoelectronic response of high-quality… Expand
Disorder-assisted electron-phonon scattering and cooling pathways in graphene.
We predict that graphene is a unique system where disorder-assisted scattering (supercollisions) dominates electron-lattice cooling over a wide range of temperatures, up to room temperature. This is… Expand
Detecting topological currents in graphene superlattices
Making use of graphene's valleys Graphene has two distinct valleys in its electronic structure, in which the electrons have the same energy. Theorists have predicted that creating an asymmetry… Expand
Chiral plasmons without magnetic field
Significance A class of collective excitations is introduced, arising from the combined action of electron interactions and Berry curvature. These excitations manifest as chiral plasmonic modes at… Expand
Shockley-Ramo theorem and long-range photocurrent response in gapless materials
Scanning photocurrent maps of gapless materials, such as graphene, often exhibit complex patterns of hot spots positioned far from current-collecting contacts. We develop a general framework that… Expand
Energy-driven drag at charge neutrality in graphene.
Coulomb coupling in graphene heterostructures results in vertical energy transfer between electrons in proximal layers. We show that, in the presence of correlated density inhomogeneity in the… Expand
Electron interactions and gap opening in graphene superlattices.
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 graphene on… Expand
Topological Bloch bands in graphene superlattices
- J. C. Song, Polnop Samutpraphoot, L. Levitov
- Physics, Medicine
- Proceedings of the National Academy of Sciences
- 15 April 2014
Significance A family of designer topological materials is introduced, comprising stacks of two-dimensional materials which by themselves are not topological, such as graphene. Previously,… Expand
Energy flows in graphene: hot carrier dynamics and cooling.
Long lifetimes of hot carriers can lead to qualitatively new types of responses in materials. The magnitude and time scales for these responses reflect the mechanisms governing energy flows. We… Expand