Volume 100, Number 6, December 2012
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 January 2013|
Quantum Hall Mach-Zehnder interferometer at fractional filling factors
1 Institute of Solid State Physics, RAS - Chernogolovka, Moscow District, 142432, Russia
2 Moscow Institute of Physics and Technology - Institutsky per. 9, Dolgoprudny, 141700, Russia
3 IOM CNR, Laboratorio TASC - 34149 Trieste, Italy, EU
4 NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore - 56127 Pisa, Italy, EU
Received: 24 August 2012
Accepted: 4 December 2012
We use a Mach-Zehnder quantum Hall interferometer of a novel design to investigate the interference effects at fractional filling factors. Our device brings together the advantages of usual Mach-Zehnder and Fabry-Perot quantum Hall interferometers. It realizes the simplest-for-analysis Mach-Zehnder interference scheme, free from Coulomb blockade effects. By contrast to the standard Mach-Zehnder realization, our device does not contain an etched region inside the interference loop. For the first time for a Mach-Zehnder interference scheme, the device demonstrates interference oscillations with Φ* = e/e*Φ0 = Φ0/ν periodicity at fractional filling factor 1/3. This result indicates that we observe a clear evidence for fractionally charged quasiparticles from simple Aharonov-Bohm interference.
PACS: 73.43.-f – Quantum Hall effects / 73.23.-b – Electronic transport in mesoscopic systems / 73.40.-c – Electronic transport in interface structures
© EPLA, 2012
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