Nai-Chang Yeh

TL;DR: In this article, the authors report directional tunneling and point-contact spectroscopy measurements on the faces of single crystals at 4.2 K. The conductance spectra show fully developed quasiparticle tunneling, Andreev reflection, and zero-bias peak characteristics, depending systematically on the junction orientation and impedance.

TL;DR: The results demonstrate a great potential of producing genuine topological insulator devices using Dirac Fermions of the surface states, when the film thickness is pushed to nanometer range.

TL;DR: In this article, the diffusion of oxygen in and out of the ceramic oxide was measured using in situ resistivity measurements, and it was found that the in-diffusion rate depends strongly on the number of isothermal anneals.

TL;DR: A plasma-enhanced CVD chemistry that enables the entire process to take place in a single step, at reduced temperatures (<420 °C), and in a matter of minutes, indicates that elevated temperatures and crystalline substrates are not necessary for synthesizing high-quality graphene.

TL;DR: By effective tuning the Fermi level via gate-voltage control, this work unveil a striking competition between weak localization and weak antilocalization at low magnetic fields in nonmagnetic ultrathin films, possibly owing to the change of the net Berry phase.