Evidence for 2D electron gas behavior in ultrathin epitaxial graphite on a SiC substrate
Abstract
Ultrathin graphite films have been grown on single crystal SiC. The films have been characterized by STM, AFM, LEED, and Auger spectroscopy. Magnetotransport measurements (4 K<T< 40 K, B<8 T) show large anisotropy typically in plane dR/dB<=1 kOhm/T, while for B perpendicular to the plane, it is up to100 kOhm/T. For some samples the magnetoresistance saturates (B 3.5 T, R 8.5 kOhm): this point is essentially temperature independent, although R(B=0) decreases with increasing temperature. The behavior is reminiscent of the insulator to Quantum Hall liquid transition observed in a disordered 2D electron gas.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARA17008B