Strong geometry dependence of the Casimir force between interpenetrated rectangular gratings

Wang, Mingkang; Tang, Lu; Ng, Ching Yan Henry; Messina, Riccardo; Guizal, Brahim; Crosse, J. A.; Antezza, Mauro; Chan, Che Ting; Chan, Ho-Leung

doi:10.1038/s41467-021-20891-4

Cited by 38 publications

(25 citation statements)

References 68 publications

(102 reference statements)

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“…New fascinating experimental possibilities in precision measurements of Casimir forces and quantum friction forces between plates and in close geometry are opening up with recent experiments [36,40,41]. In particular, in [41], the Casimir force between interpenetrated rectangular gratings was measured at T = 4 K.…”

Section: Discussionmentioning

confidence: 99%

Puzzling Low-Temperature Behavior of the Van Der Waals Friction Force between Metallic Plates in Relative Motion

Dedkov

2021

Universe

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This paper presents the results of calculating the van der Waals friction force (dissipative fluctuation-electromagnetic force) between metallic (Au) plates in relative motion at temperatures close to 1 K. The stopping tangential force arises between moving plates along with the usual Casimir force of attraction, which has been routinely measured with high precision over the past two decades. At room temperatures, the former force is 10 orders of magnitude less than the latter, but at temperatures T<50 K, friction increases sharply. The calculations have been carried out in the framework of the Levin-Polevoi-Rytov fluctuation electromagnetic theory. For metallic plates with perfect crystal lattices and without defects, van der Waals friction force is shown to increase with decreasing temperature as T−4. In the presence of residual resistance ρ0 of the metal, a plateau is formed on the temperature dependence of the friction force at T→0 with a height proportional to ρ0−0.8. Another important finding is the weak force-distance dependence ~a−q (with q<1). The absolute values of the friction forces are achievable for measurements in AFM-based experiments.

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Section: Discussionmentioning

confidence: 99%

Puzzling Low-Temperature Behavior of the Van Der Waals Friction Force between Metallic Plates in Relative Motion

Dedkov

2021

Universe

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“…The distinct phases of magic angle TBGs are low temperature phenomena, i.e below 4 K [65,66]. Casimir forces as a function of distance and optical axis orientation for anisotropic materials have been measured at liquid He temperatures [67][68][69] indicating that such experiments of the phases of the magic angle TBGs are possible in the laboratory. Additionally, our calculations show that the Casimir torque for nematic TBGs is in the 6 nN.m/m 2 to 0.01 nN.m/m 2 range for the separation of 0.1µm to 1µm, which is achievable experimentally [37].…”

Section: Discussionmentioning

confidence: 99%

Twisted bilayered graphenes at magic angles and Casimir interactions: correlation-driven effects

Rodriguez-López¹,

Le²,

Calderón³

et al. 2022

2D Mater.

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Twisted bilayered graphenes at magic angles are systems housing long ranged periodicity of moir´e patterns together with short ranged periodicity associated with the individual graphenes. Such materials are a fertile ground for novel states largely driven by electronic correlations. Here we find that the ubiquitous Casimir force can serve as a platform for macroscopic manifestations of the quantum effects stemming from the magic angle bilayered graphenes properties and their phases determined by electronic correlations. By utilizing comprehensive calculations for the electronic and optical response, we find that Casimir torque can probe anisotropy from the Drude conductivities in nematic states, while repulsion in the Casimir force can help identify topologically nontrivial phases in magic angle twisted bilayered graphenes.

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“…Scaling up to multiple particles will open up new avenues of research, including probing quantum correlations and entanglement [14][15][16][17], complex phases emerging from interacting particles [18][19][20][21][22] and sensing of weak forces [23][24][25][26]. Investigating these phenomena with levitated optomechanical systems requires three ingredients: 1) trapping of multiple particles, 2) cooling their motional degrees of freedom, and 3) controlling the interactions between them.…”

Section: Introductionmentioning

confidence: 99%

Scalable all-optical cold damping of levitated nanoparticles

Vijayan¹,

Zhang²,

Piotrowski³

et al. 2022

Preprint

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The field of levitodynamics has made significant progress towards controlling and studying the motion of a levitated nanoparticle. Motional control relies on either autonomous feedback via a cavity or measurement-based feedback via external forces. Recent demonstrations of measurementbased ground-state cooling of a single nanoparticle employ linear velocity feedback, also called cold damping, and require the use of electrostatic forces on charged particles via external electrodes.Here we introduce a novel all-optical cold damping scheme based on spatial modulation of the trap position that is scalable to multiple particles. The scheme relies on using programmable optical tweezers to provide full independent control over trap frequency and position of each tweezer. We show that the technique cools the center-of-mass motion of particles down to 17 mK at a pressure of 2 × 10 −6 mbar and demonstrate its scalability by simultaneously cooling the motion of two particles. Our work paves the way towards studying quantum interactions between particles, achieving 3D quantum control of particle motion without cavity-based cooling, electrodes or charged particles, and probing multipartite entanglement in levitated optomechanical systems.

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Strong geometry dependence of the Casimir force between interpenetrated rectangular gratings

Cited by 38 publications

References 68 publications

Puzzling Low-Temperature Behavior of the Van Der Waals Friction Force between Metallic Plates in Relative Motion

Puzzling Low-Temperature Behavior of the Van Der Waals Friction Force between Metallic Plates in Relative Motion

Twisted bilayered graphenes at magic angles and Casimir interactions: correlation-driven effects

Scalable all-optical cold damping of levitated nanoparticles

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