Abstract
Measurements are reported of the heat capacity of bound to an atomically layered film on the surface of graphite. At coverages , the forms a uniform 2D Fermi system. Thereafter with increasing we resolve two steps in the heat capacity, each arising from the formation of a further 2D continuum built on excited surface-normal states. We infer information on the hydrodynamic mass, quasiparticle interactions, and energetics of these states. Both short range repulsive interactions and ripplon mediated quasiparticle interactions are important.
- Received 28 January 1999
DOI:https://doi.org/10.1103/PhysRevLett.82.4030
©1999 American Physical Society