Low-dimensional confining structures on the surface of helium films suspended on designed cavitiesLow-dimensional confining structures on the surface of helium films suspended on designed cavities
Faculty of Sciences. Physics
Condensed Matter Theory
2013New York, 2013
Journal of low temperature physics. - New York
173(2013):3-4, p. 207-226
University of Antwerp
We investigate the formation of quantum confined structures on the surface of a liquid helium film suspended on a nanostructured substrate. We show theoretically that, by nanostructuring the substrate, it is possible to change the geometry of the liquid helium surface, opening the possibility of designing and controlling the formation of valleys with different shapes. By applying an external electric field perpendicular to the substrate plane, surface electrons can be trapped into these valleys, as in a quantum dot. We investigate how the external parameters, such as the electric field strength and the height of the liquid helium bath, can be tuned to control the energy spectrum of the trapped surface electrons.