Two-Dimensional Quantum Oscillations of the Conductance at LaAlO3/SrTiO3 Interfaces
Abstract
We report on a study of magnetotransport in LaAlO3/SrTiO3 interfaces characterized by mobilities of the order of several thousands cm2/Vs. We observe Shubnikov-de Haas oscillations whose period depends only on the perpendicular component of the magnetic field. This observation directly indicates the formation of a two-dimensional electron gas originating from quantum confinement at the interface. From the temperature dependence of the oscillation amplitude we extract an effective carrier mass m*≃1.45me. An electric field applied in the back-gate geometry increases the mobility, the carrier density, and the oscillation frequency.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2010
- DOI:
- 10.1103/PhysRevLett.105.236802
- arXiv:
- arXiv:1007.4941
- Bibcode:
- 2010PhRvL.105w6802C
- Keywords:
-
- 73.20.-r;
- 71.18.+y;
- 73.21.-b;
- 73.40.-c;
- Electron states at surfaces and interfaces;
- Fermi surface: calculations and measurements;
- effective mass g factor;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Electronic transport in interface structures;
- Condensed Matter - Materials Science
- E-Print:
- 4 pages, 4 figures