22 citations · 41 across the 3 of their papers we have counts for
6 papers
Mid-infrared photoconductivity spectra of single tellurium nanowires]{Mid-infrared photoconductivity spectra of single tellurium nanowires
Pengke Li
Due to its low bandgap and high optical efficiency, tellurium is considered an important material candidate for mid-infrared applications. Taking advantage of its structural anisot…
Origins of electromagnetic anisotropy in monolayer black phosphorus
Pengke Li
Contrary to empirical observations, lowest-order theory predicts that monolayer black phosphorus ("phosphorene") is completely immune to zigzag-polarized optical ex…
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…
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…
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…
Spin-dependent optical properties in strained silicon and germanium
Pengke Li, Dhara Trivedi, Hanan Dery
We present a comprehensive theory of the circularly polarized luminescence and its dependence on strain in spin-polarized Si and Ge. Symmetries of wavefunctions and interactions ar…