5 papers
Field-effect mobility enhanced by tuning the Fermi level into the band gap of Bi2Se3
Peng Wei, Zhiyong Wang, Xinfei Liu +2
By eliminating normal fabrication processes, we preserve the bulk insulating state of calcium-doped Bi2Se3 single crystals in suspended nanodevices, as indicated by the activated t…
Derivative relations between electrical and thermoelectric quantum transport coefficients in graphene
Xinfei Liu, Zhongshui Ma, Jing Shi
We find that the empirical relation between the longitudinal and Hall resistivities (i.e. Rxx and Rxy) and its counterpart between the Seebeck and Nernst coefficients (i.e. Sxx and…
Tuning carrier type and density in Bi2Se3 by Ca-doping
Zhiyong Wang, Tao Lin, Peng Wei +4
The carrier type and density in Bi2Se3 single crystals are systematically tuned by introducing a calcium (Ca) dopant. A carrier density of ~1x1017 cm-3 which corresponds to ~25 meV…
Optical characterization of BiSe in a magnetic field: infrared evidence for magnetoelectric coupling in a topological insulator material
A. D. LaForge, A. Frenzel, B. C. Pursley +4
We present an infrared magneto-optical study of the highly thermoelectric narrow-gap semiconductor BiSe. Far-infrared and mid-infrared (IR) reflectance and transmission mea…
Interface Ferromagnetism in (110)-Oriented La0.7Sr0.3MnO3/SrTiO3 Ultrathin Superlattices
J. X. Ma, X. F. Liu, T. Lin +5
We explore manganite interface magnetism in epitaxially grown La0.7Sr0.3MnO3(LSMO)/SrTiO3 ultrathin superlattices (SL) along (110) orientation. we show that robust ferromagnetism p…