Probing the screening of the Casimir interaction with optical tweezers
- URL: http://arxiv.org/abs/2104.00157v2
- Date: Thu, 24 Jun 2021 18:25:10 GMT
- Title: Probing the screening of the Casimir interaction with optical tweezers
- Authors: L. B. Pires, D. S. Ether, B. Spreng, G. R. S. Ara\'ujo, R. S. Decca,
R. S. Dutra, M. Borges, F. S. S. Rosa, G.-L. Ingold, M. J. B. Moura, S.
Frases, B. Pontes, H. M. Nussenzveig, S. Reynaud, N. B. Viana, P. A. Maia
Neto
- Abstract summary: We measure the colloidal interaction between two microspheres in a silica solution in the distance range from $0.2,mu$m to $0.5,mu$m with the help of optical tweezers.
Results shed light on the nature of the thermal zero-frequency contribution and indicate that the Casimir attraction across polar liquids has a longer range than previously predicted.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We measure the colloidal interaction between two silica microspheres in
aqueous solution in the distance range from $0.2\,\mu$m to $0.5\,\mu$m with the
help of optical tweezers. When employing a sample with a low salt
concentration, the resulting interaction is dominated by the repulsive
double-layer interaction which is fully characterized. The double-layer
interaction is suppressed when adding $0.22\,$M of salt to our sample, thus
leading to a purely attractive Casimir signal. When analyzing the experimental
data for the potential energy and force, we find good agreement with
theoretical results based on the scattering approach. At the distance range
probed experimentally, the interaction arises mainly from the unscreened
transverse magnetic contribution in the zero-frequency limit, with nonzero
Matsubara frequencies providing a negligible contribution. In contrast, such
unscreened contribution is not included by the standard theoretical model of
the Casimir interaction in electrolyte solutions, in which the zero-frequency
term is treated separately as an electrostatic fluctuational effect. As a
consequence, the resulting attraction is too weak in this standard model, by
approximately one order of magnitude, to explain the experimental data.
Overall, our experimental results shed light on the nature of the thermal
zero-frequency contribution and indicate that the Casimir attraction across
polar liquids has a longer range than previously predicted.
Related papers
- Relaxation of experimental parameters in a Quantum-Gravity Induced
Entanglement of Masses Protocol using electromagnetic screening [0.0]
The quantum gravity-induced entanglement of masses (QGEM) experiment is used to test the quantum nature of gravity in a lab.
We will consider a parallel configuration of the QGEM experiment, where we will estimate the EM-induced dephasing rate, run-by-run systematic errors which will induce dephasing, and also provide constraints on the size of the superposition.
arXiv Detail & Related papers (2023-07-14T12:08:57Z) - Quantum Monte Carlo study of the role of p-wave interactions in
ultracold repulsive Fermi gases [0.0]
We investigate the ground-state properties of single-component Fermi gases with short-range repulsive interactions.
A comparison against recently derived second-order perturbative results shows good agreement in a broad range of interaction strength.
We find remarkable agreement with a recently derived fourth-order expansion that includes $p$-wave contributions.
arXiv Detail & Related papers (2022-12-18T20:08:32Z) - On the Su-Schrieffer-Heeger model of electron transport: low-temperature
optical conductivity by the Mellin transform [62.997667081978825]
We describe the low-temperature optical conductivity as a function of frequency for a quantum-mechanical system of electrons that hop along a polymer chain.
Our goal is to show vias how the interband conductivity of this system behaves as the smallest energy bandgap tends to close.
arXiv Detail & Related papers (2022-09-26T23:17:39Z) - Probing dynamics of a two-dimensional dipolar spin ensemble using single
qubit sensor [62.997667081978825]
We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal.
We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder.
Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
arXiv Detail & Related papers (2022-07-21T18:00:17Z) - Casimir effect for magnetic media: Spatially nonlocal response to the
off-shell quantum fluctuation [0.0]
We extend the Lifshitz theory of the Casimir force to the case of two parallel magnetic metal plates.
We compute the gradient of the Casimir force between Ni-coated surfaces of a sphere and a plate using the alternative nonlocal response functions.
arXiv Detail & Related papers (2021-10-04T09:50:58Z) - Dispersive readout of molecular spin qudits [68.8204255655161]
We study the physics of a magnetic molecule described by a "giant" spin with multiple $d > 2$ spin states.
We derive an expression for the output modes in the dispersive regime of operation.
We find that the measurement of the cavity transmission allows to uniquely determine the spin state of the qudits.
arXiv Detail & Related papers (2021-09-29T18:00:09Z) - Measurement of the Casimir Force between 0.2 and 8 mum: Experimental
Procedures and Comparison with Theory [0.0]
We present results on the determination of the differential Casimir force between an Au-coated sapphire sphere and the top and bottom of Au-coated deep silicon trenches.
The random and systematic errors in the measured force signal are determined at the 95% confidence level.
The role of surface roughness and edge effects is investigated and shown to be negligibly small.
arXiv Detail & Related papers (2021-04-08T16:00:59Z) - Light-matter interactions near photonic Weyl points [68.8204255655161]
Weyl photons appear when two three-dimensional photonic bands with linear dispersion are degenerated at a single momentum point, labeled as Weyl point.
We analyze the dynamics of a single quantum emitter coupled to a Weyl photonic bath as a function of its detuning with respect to the Weyl point.
arXiv Detail & Related papers (2020-12-23T18:51:13Z) - Extracting non-local inter-polaron interactions from collisional
dynamics [0.0]
This study develops a novel experimental method of deducing the profile of interaction induced between impurities in a trapped gas of ultracold Fermi/Bose atoms.
Numerical simulations of the quantum dynamics reveal the possibility to obtain information regarding the non-local induced interaction between two polarons.
arXiv Detail & Related papers (2020-11-16T12:56:55Z) - Optically pumped spin polarization as a probe of many-body
thermalization [50.591267188664666]
We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers.
We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength.
Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
arXiv Detail & Related papers (2020-05-01T23:16:33Z) - Casimir force between Weyl semimetals in a chiral medium [68.8204255655161]
We study the Casimir effect in a system composed of two Weyl semimetals separated by a gap filled with a chiral medium.
We find that if the medium between the two WSMs is a Faraday material, a repulsive Casimir force can be obtained.
arXiv Detail & Related papers (2020-01-28T14:08:45Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.