Thomas Flanagan

Growth and characterization of hybrid insulating ferromagnet-topological insulator heterostructure devices

We report the integration of the insulating ferromagnet GdN with epitaxial films of the topological insulator Bi2Se3 and present detailed structural, magnetic, and transport characterization of the heterostructures. Fabrication of multi-channel Hall bars with bare and GdN-capped sections enable direct comparison of magnetotransport properties. We show that the presence of the magnetic overlayer results in suppression of weak anti-localization at the top surface.

Ferromagnetism and spin-dependent transport in n-type Mn-doped bismuth telluride thin films

We describe a detailed study of the structural, magnetic, and magnetotransport properties of single-crystal,

Helicity dependent photocurrent in electrically gated (Bi 1−x Sb x ) 2 Te 3 thin films

n

Interplay between ferromagnetism, surface states, and quantum corrections in a magnetically doped topological insulator

-type, Mn-doped bismuth telluride thin films grown by molecular beam epitaxy. With increasing Mn concentration, the crystal structure changes from the tetradymite structure of the

Surface-sensitive two-dimensional magneto-fingerprint in mesoscopic Bi2Se3 channels.

{\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}

Epitaxial Growth and Characterization of Iron Chalcogenide/Bismuth Chalcogenide Heterostructures

parent crystal at low Mn concentrations towards a BiTe phase in the (

Study of the circular photo-galvanic effect in electrically gated (Bi,Sb)

{\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}{)}_{m}({\mathrm{Bi}}_{2}{)}_{n}

_2

homologous series. Magnetization measurements reveal the onset of ferromagnetism with a Curie temperature in the range 13.8\char21{}17 K in films with

Te

\ensuremath{\sim}

_3

2%