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Scalable Spin Squeezing in Two-Dimensional Arrays of Dipolar Large-S Spins.
Phys Rev Lett
August 2024
ENS de Lyon, CNRS, Laboratoire de Physique, F-69342 Lyon, France.
We theoretically show that the spin-spin interactions realized in two-dimensional Mott insulators of large-spin magnetic atoms (such as Cr, Er, or Dy) lead to scalable spin squeezing along the nonequilibrium unitary evolution initialized in a coherent spin state. An experimentally relevant perturbation to the collective squeezing dynamics is offered by a quadratic Zeeman shift, which leads instead to squeezing of individual spins. Making use of a truncated cumulant expansion for the quantum fluctuations of the spin array, we show that, for sufficiently small quadratic shifts, the spin squeezing dynamics is akin to that produced by the paradigmatic one-axis-twisting model-as expected from an effective separation between collective-spin and spin-wave variables.
View Article and Find Full Text PDFMulti-ion Frequency Reference Using Dynamical Decoupling.
Phys Rev Lett
July 2024
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.
We present the experimental realization of a continuous dynamical decoupling scheme which suppresses leading frequency shifts in a multi-ion frequency reference based on ^{40}Ca^{+}. By near-resonant magnetic coupling of the ^{2}S_{1/2} and ^{2}D_{5/2} Zeeman sublevels using radio-frequency dressing fields, engineered transitions with reduced sensitivity to magnetic-field fluctuations are obtained. A second stage detuned dressing field reduces the influence of amplitude noise in the first stage driving fields and decreases 2nd-rank tensor shifts, such as the electric quadrupole shift.
View Article and Find Full Text PDFAn experimental platform for investigation of the Zeeman effect in strong magnetic fields.
Rev Sci Instrum
April 2024
Department of Physics, University of Nevada, Reno, 1664 N Virginia St., Reno, Nevada 89557, USA.
An experimental platform is developed for the investigation of the Zeeman effect in strong magnetic fields. Mega-Gauss magnetic fields are generated by a 1 MA Zebra pulsed power machine using metal rod loads. A gas jet or CH oil on the load is the source of hydrogen.
View Article and Find Full Text PDFFluctuations in Planar Magnetotransport Due to Tilted Dirac Cones in Topological Materials.
Nano Lett
August 2023
Faculty for Physics and Astronomy (EP3), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Fluctuations in planar magnetotransport are ubiquitous in topological HgTe structures, in both tensile (topological insulator) and compressively strained layers (Weyl semimetal phase). We show that the common reason for the fluctuations is the presence of tilted Dirac cones combined with the formation of charge puddles. The origin of the tilted Dirac cones is the mix of the Zeeman term due to the in-plane magnetic field and quadratic contributions to the dispersion relation.
View Article and Find Full Text PDFDiscrete time model of sexual systems.
Heliyon
July 2023
EPSRC & MRC Centre for Real-World Systems, Zeeman Building, University of Warwick, Coventry CV4 7AL, UK.
Small factors are the biggest contributors to the biggest changes in an ecosystem which may lead to its demise. Simple things such as tweaking the humidity or tampering with the temperature can be the downfall of the habitants and the ecosystem itself. These changes can be observed right now with the consistent temperature increase on Earth along with the slew of issues that come with global warming.
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