TY - JOUR
T1 - Strongly coupled edge states in a graphene quantum Hall interferometer
AU - Werkmeister, Thomas
AU - Ehrets, James R.
AU - Ronen, Yuval
AU - Wesson, Marie E.
AU - Najafabadi, Danial
AU - Wei, Zezhu
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Feldman, D. E.
AU - Halperin, Bertrand I.
AU - Yacoby, Amir
AU - Kim, Philip
N1 - We thank Andrew Pierce and Raymond Ashoori for helpful comments in the early stages of this work. We also thank Raymond Ashoori for lending important cryostat parts used in this measurement and Jim MacArthur for building electronics used in our experiment. P.K., T.W., and Y.R. acknowledge support from DOE (DE-SC0012260) for sample preparation, measurement, characterization, and analysis. J.R.E. acknowledges support from ARO MURI (N00014-21-1-2537) for sample preparation, measurement, characterization, and analysis. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001, JSPS KAKENHI Grant Number JP20H00354 and the CREST(JPMJCR15F3), JST. D.E.F. and Z.W. acknowledge support by the National Science Foundation under Grant No. DMR-2204635. B.I.H. acknowledges support from NSF grant DMR-1231319. M.E.W. and A.Y. acknowledge support from Quantum Science Center (QSC), a National Quantum Information Science Research Center of the U.S. Department of Energy. Nanofabrication was performed at the Center for Nanoscale Systems at Harvard, supported in part by an NSF NNIN award ECS-00335765.Nanofabrication was performed at the Center for Nanoscale Systems at Harvard, supported in part by an NSF NNIN award ECS-00335765.
PY - 2024/8/2
Y1 - 2024/8/2
N2 - Electronic interferometers using the chiral, one-dimensional (1D) edge channels of the quantum Hall effect (QHE) can demonstrate a wealth of fundamental phenomena. The recent observation of phase jumps in a single edge channel Fabry-Pérot (FP) interferometer revealed anyonic quasiparticle exchange statistics in the fractional QHE. When multiple edge channels are involved, FP interferometers have exhibited anomalous Aharonov-Bohm (AB) interference frequency doubling, suggesting interference of 2e quasiparticles. Here, we use a highly tunable graphene-based QHE FP interferometer to observe the connection between integer QHE interference phase jumps and AB frequency doubling, unveiling the intricate nature of inter edge state coupling in a multichannel QHE interferometer. By tuning the electron density continuously from the QHE filling factor {\nu}<2 to {\nu}>7, we observe periodic interference phase jumps leading to AB frequency doubling. Our observations clearly demonstrate that in our samples the combination of repulsive Coulomb interaction between the spin-split, copropagating edge channels and charge quantization explains the frequency-doubled regime without electron pairing, via a near-perfect anti-correlation between the two edge channels. Our results show that interferometers are sensitive probes of microscopic interactions between edge states, which can cause strong correlations between chiral 1D channels even in the integer QHE regime.
AB - Electronic interferometers using the chiral, one-dimensional (1D) edge channels of the quantum Hall effect (QHE) can demonstrate a wealth of fundamental phenomena. The recent observation of phase jumps in a single edge channel Fabry-Pérot (FP) interferometer revealed anyonic quasiparticle exchange statistics in the fractional QHE. When multiple edge channels are involved, FP interferometers have exhibited anomalous Aharonov-Bohm (AB) interference frequency doubling, suggesting interference of 2e quasiparticles. Here, we use a highly tunable graphene-based QHE FP interferometer to observe the connection between integer QHE interference phase jumps and AB frequency doubling, unveiling the intricate nature of inter edge state coupling in a multichannel QHE interferometer. By tuning the electron density continuously from the QHE filling factor {\nu}<2 to {\nu}>7, we observe periodic interference phase jumps leading to AB frequency doubling. Our observations clearly demonstrate that in our samples the combination of repulsive Coulomb interaction between the spin-split, copropagating edge channels and charge quantization explains the frequency-doubled regime without electron pairing, via a near-perfect anti-correlation between the two edge channels. Our results show that interferometers are sensitive probes of microscopic interactions between edge states, which can cause strong correlations between chiral 1D channels even in the integer QHE regime.
UR - http://www.scopus.com/inward/record.url?scp=85200370530&partnerID=8YFLogxK
U2 - https://doi.org/10.1038/s41467-024-50695-1
DO - https://doi.org/10.1038/s41467-024-50695-1
M3 - مقالة
C2 - 39095353
SN - 2041-1723
VL - 15
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 6533
ER -