1.1k citations · 3.1k across the 34 of their papers we have counts for
34 papers
Excitons without effective mass: biased bilayer graphene
Pengke Li, Ian Appelbaum
Understanding the dynamics of excitons in two dimensional semiconductors requires a theory that incorporates the essential physics distinct from their three-dimensional counterpart…
Kramers' revenge
Pengke Li, Ian Appelbaum
The combination of space inversion and time reversal symmetries result in doubly-degenerate Bloch states with opposite spin. Many lattices with these symmetries can be constructed…
Robust zero-energy bound states in a helical lattice
Pengke Li, Jay D. Sau, Ian Appelbaum
Atomic-scale helices exist as motifs for several material lattices. We examine a tight-binding model for a single one-dimensional monatomic chain with a p-orbital basis coiled into…
Intrinsic two-dimensional state on the pristine surface of tellurium
Pengke Li, Ian Appelbaum
Using a tight-binding description, we show how the zero-dimensional state bound to the edge of a single one-dimensional helical chain of tellurium atoms evolves into two-dimensiona…
Electrons, holes, and spin in the IV-VI monolayer 'four-six-enes'
Ian Appelbaum, Pengke Li
Bandedge states in the indirect-gap group-IV metal monochalcogenide monolayers ('four-six-enes' such as SnS, GeTe, etc.) inherit the properties of nearby reciprocal space points of…
Interpreting current-induced spin polarization in topological insulator surface states
Pengke Li, Ian Appelbaum
Several recent experiments on three-dimensional topological insulators claim to observe a large charge current-induced non-equilibrium ensemble spin polarization of electrons in th…