Topological-metal to band-insulator transition in (Bi(1-x)In(x))2Se3 thin films.

Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3

Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi(1-x)Mn(x))2Se3 is a prototypical magnetic topological insulator with a pronounced surface band gap of ∼100 meV. We show that this gap is neither due to ferromagnetic order in the bulk or at the surface nor to the loc...

Structural, electrical, and optical properties of La1ÀzYzHx switchable mirrors

Thin La12zYzHx films, in the composition range 0,z,1 and 0,x,3, are studied using x-ray diffraction, dc resistivity measurements, reflectance-transmittance measurements, and ellipsometry in the visible and nearinfrared spectral range. For x50 the structural phase diagram is similar to that of the bulk system. Upon hydrogen absorption and desorption, the La12zYzHx films do not disproportionate. ...

ar X iv : c on d - m at / 0 10 45 04 v 2 8 O ct 2 00 1 Electron Quasiparticles Drive the Superconductor - to - Insulator Transition in Homogeneously Disordered Thin Films

Transport data on Bi, MoGe, and PbBi/Ge homogeneously-disordered thin films demonstrate that the critical resistivity, Rc, at the nominal insulator-superconductor transition is linearly proportional to the normal sheet resistance, RN . In addition, the critical magnetic field scales linearly with the superconducting energy gap and is well-approximated by Hc2. Because RN is determined at high te...

Effect of oxygen stoichiometry on the insulator-metal phase transition in vanadium oxide thin films studied using optical pump-terahertz probe spectroscopy

Observation of a topological crystalline insulator phase and topological phase transition in Pb(1-x)Sn(x)Te.

A topological insulator protected by time-reversal symmetry is realized via spin-orbit interaction-driven band inversion. The topological phase in the Bi(1-x)Sb(x) system is due to an odd number of band inversions. A related spin-orbit system, the Pb(1-x)Sn(x)Te, has long been known to contain an even number of inversions based on band theory. Here we experimentally investigate the possibility ...