Surface plasmons in doped topological insulators

Manipulating surface-related ferromagnetism in modulation-doped topological insulators.

A new class of devices based on topological insulators (TI) can be achieved by the direct engineering of the time-reversal-symmetry (TRS) protected surface states. In the meantime, a variety of interesting phenomena are also expected when additional ferromagnetism is introduced to the original topological order. In this Letter, we report the magnetic responses from the magnetically modulation-d...

Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2}Se_{3}.

We have investigated plasmonic excitations at the surface of Bi_{2}Se_{3}(0001) via high-resolution electron energy loss spectroscopy. For low parallel momentum transfer q_{∥}, the loss spectrum shows a distinctive feature peaked at 104 meV. This mode varies weakly with q_{∥}. The behavior of its intensity as a function of primary energy and scattering angle indicates that it is a surface plasm...

Topological insulators: The surface surfaces.

Surface States of Topological Insulators

We introduce a topological boundary condition to study the surface states of topological insulators within a long-wavelength four-band model. We find that the Dirac point energy, the band curvature, and the spin texture of surface states are crystal-face dependent. For an arbitrary termination of a bulk crystal, the energy of the symmetry protected Dirac point is determined by the bulk physics ...

Infrared surface plasmons on heavily doped silicon

Monas Shahzad, Gautam Medhi, Robert E. Peale, Walter R. Buchwald, Justin W. Cleary, Richard Soref, Glenn D. Boreman, and Oliver Edwards Department of Physics, University of Central Florida, Orlando, Florida 32816, USA Solid State Scientific Corporation, 27-2 Wright Road, Hollis, New Hampshire 03049, USA Sensors Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45...