Sideways tunnelling and fractional Josephson frequency in double-layered quantum Hall systems
Department of Physics, Massachusetts Institute of Technology,
77 Massachusetts Avenue, Cambridge, MA 02139, USA
2 Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA
Accepted: 11 June 1996
The filling fraction 1/k double-layered quantum Hall state has been shown to exhibit many superfluid properties. Here we propose the notion of “sideways tunnelling", in which a current tunnels between two such 1/k states through an incompressible fractional quantum Hall state of filling fraction 2/m. We predict an alternating tunnelling current or a narrow-band noise at a frequency , as a consequence of the tunnelling of e/m fractional charges.
PACS: 73.40.-c – Electronic transport in interface structures.
© EDP Sciences, 1996