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Measuring gravitational attraction with a lattice atom interferometer.
Nature
July 2024
Department of Physics, University of California, Berkeley, Berkeley, CA, USA.
Despite being the dominant force of nature on large scales, gravity remains relatively elusive to precision laboratory experiments. Atom interferometers are powerful tools for investigating, for example, Earth's gravity, the gravitational constant, deviations from Newtonian gravity and general relativity. However, using atoms in free fall limits measurement time to a few seconds, and much less when measuring interactions with a small source mass.
View Article and Find Full Text PDFAnomalous Aharonov-Bohm Interference in the Presence of Edge Reconstruction.
Phys Rev Lett
February 2024
Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Interferometry is a vital tool for studying fundamental features in the quantum Hall effect. For instance, Aharonov-Bohm interference in a quantum Hall interferometer can probe the wave-particle duality of electrons and quasiparticles. Here, we report an unusual Aharonov-Bohm interference of the outermost edge mode in a quantum Hall Fabry-Pérot interferometer, whose Coulomb interactions were suppressed with a grounded drain in the interior bulk of the interferometer.
View Article and Find Full Text PDFDynamic heat and charge transports through double-quantum-dot-interferometer modulated by Majorana bound states and time-oscillating Aharonov-Bohm flux.
J Phys Condens Matter
February 2023
School of Physics, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
Dynamic properties of Majorana bound states (MBSs) coupled double-quantum-dot (DQD) interferometer threaded with ac magnetic flux are investigated, and the time-averaged thermal current formulas are derived. Photon-assisted local and nonlocal Andreev reflections contribute efficiently to the charge and heat transports. The modifications of source-drain electric, electric-thermal, thermal conductances (,,), Seebeck coefficient (), and thermoelectric figure of merit () versus AB phase have been calculated numerically.
View Article and Find Full Text PDFTransmission across non-HermitianPT-symmetric quantum dots and ladders.
J Phys Condens Matter
December 2022
School of Physics, University of Hyderabad, C. R. Rao Road, Gachibowli, Hyderabad 500046, India.
A non-Hermitian (NH) region connected to semi-infinite Hermitian lattices acts either as a source or as a sink and the probability current is not conserved in a scattering typically. Even aPT-symmetric region that contains both a source and a sink does not lead to current conservation plainly. We propose a model and study the scattering across a NHPT-symmetric two-level quantum dot (QD) connected to two semi-infinite one-dimensional lattices in a special way so that the probability current is conserved.
View Article and Find Full Text PDFQuantum Hall Interferometry in Triangular Domains of Marginally Twisted Bilayer Graphene.
Nano Lett
July 2022
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, India.
Quantum Hall (QH) interferometry provides an archetypal platform for the experimental realization of braiding statistics of fractional QH states. However, the complexity of observing fractional statistics requires phase coherence over the length of the interferometer, as well as suppression of Coulomb charging energy. Here, we demonstrate a new type of QH interferometer based on marginally twisted bilayer graphene (mtBLG), with a twist angle θ ≈ 0.
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