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A standing problem in low dimensional electron systems is the nature of the5/2 fractional quantum Hall state: its elementary excitations are a focus forboth elucidating the state's properties and as candidates in methods to performtopological quantum computation. Interferometric devices may be employed tomanipulate and measure quantum Hall edge excitations. Here we use a small areaedge state interferometer designed to observe quasiparticle interferenceeffects. Oscillations consistent in detail with the Aharanov-Bohm effect areobserved for integer and fractional quantum Hall states (filling factors 2,5/3, and 7/3) with periods corresponding to their respective charges andmagnetic field positions. With these as charge calibrations, at 5/2 fillingfactor and at lowest temperatures periodic transmission through the deviceconsistent with quasiparticle charge e/4 is observed. The principal finding ofthis work is that in addtion to these e/4 oscillations, periodic structurescorresponding to e/2 are also observed at 5/2 and at lowest temperatures.Properties of the e/4 and e/2 oscillations are examined with the devicesensitivity sufficient to observe temperature evolution of the 5/2quasiparticle interference. In the model of quasiparticle interference, thispresence of an effective e/2 period may empirically reflect an e/2quasiparticle charge, or may reflect multiple passes of the e/4 quasiparticlearound the interferometer. These results are discussed within a picture of e/4quasiparticle excitations potentially possessing non-Abelian statistics. Thesestudies demonstrate the capacity to perform interferometry on 5/2 excitationsand reveal properties important for understanding this state and itsexcitations.

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