Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M65: Fractional Quantum Hall Effect: Experiment
8:00 AM–10:48 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Grant Park C
Sponsoring
Unit:
DCMP
Chair: James Nakamura, Purdue University
Abstract: M65.00004 : Fractional Interference in a Mach-Zehnder Interferometer
8:36 AM–8:48 AM
Presenter:
HEMANTA K KUNDU
(Department of Condensed Matter Physics, Braun Center of Sub-Micron Research Weizmann Institute of Science, Israel)
Authors:
HEMANTA K KUNDU
(Department of Condensed Matter Physics, Braun Center of Sub-Micron Research Weizmann Institute of Science, Israel)
Sourav Biswas
(Weizmann Institute of Science)
Nissim Ofek
(Quantum Machines, Israel)
Vladimir Umansky
(Department of Condensed Matter Physics, Braun Center of Sub-Micron Research Weizmann Institute of Science, Israel)
Moty Heiblum
(Department of Condensed Matter Physics, Braun Center of Sub-Micron Research Weizmann Institute of Science, Israel)
We report of an observation of AB interference of the outer-most edge mode v=1/3 in bulk filling v=2/5 in a MZI with path length 2 micron at ~10mK. While the maximum visibility of an integer mode (outer-most at v=2) was ~86%, the fractional one was ~20%; a factor of 2 smaller than the expected one. With fairly transparent QPC’s transmission of the v=1/3 mode (t>0.5), the partitioned charge was found to be e*=e/3. As expected, the flux period was Φ0 – the flux quantum, similar to that of electrons (due to the opaqueness of the internal ohmic contact to e/3 charges). We also observed peak visibility for MZI transmission of T~0.6 (away from T=0.5 for electrons), and an electronic behavior (charge and visibility) as the QPC’s were fairly pinched, also agreeing with fractional interference.
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