4 papers
Coexistence of two- and three-dimensional Shubnikov-de Haas oscillations in Ar^+ -irradiated KTaO_3
S. Harashima, C. Bell, M. Kim +3
We report the electron doping in the surface vicinity of KTaO_3 by inducing oxygen-vacancies via Ar^+ -irradiation. The doped electrons have high mobility (> 10^4 cm^2/Vs) at low t…
Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO
P. D. C. King, R. H. He, T. Eknapakul +13
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the surface of the transition-metal oxide KTaO. From angle-resolved photoemission, we find…
Dominant mobility modulation by the electric field effect at the LaAlO_3 / SrTiO_3 interface
C. Bell, S. Harashima, Y. Kozuka +4
Caviglia et al. [Nature (London) 456, 624 (2008)] have found that the superconducting LaAlO_3 / SrTiO_3 interface can be gate modulated. A central issue is to determine the princip…
Thickness dependence of the mobility at the LaAlO_3 / SrTiO_3 interface
C. Bell, S. Harashima, Y. Hikita +1
The electronic transport properties of a series of LaAlO_3 / SrTiO_3 interfaces were investigated, and a systematic thickness dependence of the sheet resistance and magnetoresistan…