Quasi-particle properties from tunneling in the v = 5/2 fractional quantum Hall state.
Quasi-particles with fractional charge and statistics, as well as modified Coulomb interactions, exist in a two-dimensional electron system in the fractional quantum Hall (FQH) regime. Theoretical models of the FQH state at filling fraction v = 5/2 make the further prediction that the wave function can encode the interchange of two quasi-particles, making this state relevant for topological quantum computing. We show that bias-dependent tunneling across a narrow constriction at v = 5/2 exhibits temperature scaling and, from fits to the theoretical scaling form, extract values for the effective charge and the interaction parameter of the quasi-particles. Ranges of values obtained are consistent with those predicted by certain models of the 5/2 state.
Radu
Iuliana P
IP
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Miller
J B
JB
Marcus
C M
CM
Kastner
M A
MA
Pfeiffer
L N
LN
West
K W
KW