Measurement of filling factor 5/2 quasiparticle interference with observation of charge e/4 and e/2 period oscillations.

ABSTRACT: A standing problem in low-dimensional electron systems is the nature of the 5/2 fractional quantum Hall (FQH) state: Its elementary excitations are a focus for both elucidating the state's properties and as candidates in methods to perform topological quantum computation. Interferometric devices may be used to manipulate and measure quantum Hall edge excitations. Here we use a small-area edge state interferometer designed to observe quasiparticle interference effects. Oscillations consistent in detail with the Aharonov-Bohm effect are observed for integer quantum Hall and FQH states (filling factors nu = 2, 5/3, and 7/3) with periods corresponding to their respective charges and magnetic field positions. With these factors as charge calibrations, periodic transmission through the device co

SUBMITTER: Willett RL 

PROVIDER: S-EPMC2690045 | biostudies-literature | 2009 Jun

REPOSITORIES: biostudies-literature