Ab initio study of electronic excitations and the dielectric function in molybdenum disulfide monolayer

Monday November 14th, 2016 leo 0

The propagator of the induced dynamically screened Coulomb interaction is calculated for the monolayer. The energy-loss rate of a point charge placed near the monolayer is calculated (using the spatial resolution of the in the direction perpendicular to the plane) and successfully compared with very recent electron-energy-loss spectroscopy measurements of […]

Whittaker modules for the affine Lie algebra A_1 ^{(1)}

Monday June 6th, 2016 leo 0

We prove the irreducibility of the universal non-degenerate Whittaker modules for the affine Lie algebra of type  with noncritical level. These modules can become simple Whittaker modules over with the same Whittaker function and central charge. We have to modulo a central character for sl2sl2 to obtain simple degenerate Whittaker […]

The Harper–Hofstadter Hamiltonian and conical diffraction in photonic lattices with grating assisted tunneling

Friday January 1st, 2016 leo 0

ABSTRACT: We propose the realization of a grating assisted tunneling scheme for tunable synthetic magnetic fields in optically induced one- and two-dimensional dielectric photonic lattices. As a signature of the synthetic magnetic fields, we demonstrate conical diffraction patterns in particular realization of these lattices, which possess Dirac points in k-space. We compare the […]