Towards a Microscopic Theory of Phase Coexistence

2001 ◽  
pp. 9-20
Author(s):  
Raphaël Cerf
Keyword(s):  
Microscopic Theory ◽  
Phase Coexistence

FERRO-HELIMAGNETIC PHASE COEXISTENCE OBSERVED BY SYNCHROTRON RADIATION AND NEUTRON TOPOGRAPHY IN MnP

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1891-C8-1892
Author(s):  
J. Baruchel ◽  
M. Schlenker ◽  
J. Sandonis
Keyword(s):  
Synchrotron Radiation ◽  
Phase Coexistence

Synthesis of ZnWO4 by the polymerizable complex method: evidence of amorphous phase coexistence during the phase formation process

2021 ◽  
Author(s):  
Magda S.S. Gondim ◽  
Eliezer C. Silva ◽  
Ananias L. dos Santos ◽  
Marcelo de Assis ◽  
José M.R. Mercury ◽  
...  
Keyword(s):  
Amorphous Phase ◽  
Phase Formation ◽  
Formation Process ◽  
Phase Coexistence ◽  
Complex Method ◽  
Method Evidence ◽  
Phase Formation Process

scholarly journals Shaping Dynamical Casimir Photons

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 189
Author(s):  
Diego A. R. Dalvit ◽  
Wilton J. M. Kort-Kamp
Keyword(s):  
Optical Properties ◽  
Lattice Structure ◽  
Casimir Effect ◽  
Surface Profile ◽  
Microscopic Theory ◽  
Space Time ◽  
Quantum Vacuum ◽  
Dynamical Casimir Effect ◽  
Photon Pairs ◽  
Time Quantum

Temporal modulation of the quantum vacuum through fast motion of a neutral body or fast changes of its optical properties is known to promote virtual into real photons, the so-called dynamical Casimir effect. Empowering modulation protocols with spatial control could enable the shaping of spectral, spatial, spin, and entanglement properties of the emitted photon pairs. Space–time quantum metasurfaces have been proposed as a platform to realize this physics via modulation of their optical properties. Here, we report the mechanical analog of this phenomenon by considering systems in which the lattice structure undergoes modulation in space and in time. We develop a microscopic theory that applies both to moving mirrors with a modulated surface profile and atomic array meta-mirrors with perturbed lattice configuration. Spatiotemporal modulation enables motion-induced generation of co- and cross-polarized photon pairs that feature frequency-linear momentum entanglement as well as vortex photon pairs featuring frequency-angular momentum entanglement. The proposed space–time dynamical Casimir effect can be interpreted as induced dynamical asymmetry in the quantum vacuum.

scholarly journals Microscopic theory for coupled atomistic magnetization and lattice dynamics

2017 ◽  
Vol 1 (7) ◽  
Author(s):  
J. Fransson ◽  
D. Thonig ◽  
P. F. Bessarab ◽  
S. Bhattacharjee ◽  
J. Hellsvik ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Microscopic Theory

scholarly journals Tuning nonlinear damping in graphene nanoresonators by parametric–direct internal resonance

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ata Keşkekler ◽  
Oriel Shoshani ◽  
Martin Lee ◽  
Herre S. J. van der Zant ◽  
Peter G. Steeneken ◽  
...  
Keyword(s):  
Parametric Resonance ◽  
Internal Resonance ◽  
Microscopic Theory ◽  
Fold Increase ◽  
Nonlinear Damping ◽  
Supporting Evidence ◽  
Nonlinear Dissipation ◽  
Modal Interactions ◽  
Solid State Physics ◽  
Internal Resonances

AbstractMechanical sources of nonlinear damping play a central role in modern physics, from solid-state physics to thermodynamics. The microscopic theory of mechanical dissipation suggests that nonlinear damping of a resonant mode can be strongly enhanced when it is coupled to a vibration mode that is close to twice its resonance frequency. To date, no experimental evidence of this enhancement has been realized. In this letter, we experimentally show that nanoresonators driven into parametric-direct internal resonance provide supporting evidence for the microscopic theory of nonlinear dissipation. By regulating the drive level, we tune the parametric resonance of a graphene nanodrum over a range of 40–70 MHz to reach successive two-to-one internal resonances, leading to a nearly two-fold increase of the nonlinear damping. Our study opens up a route towards utilizing modal interactions and parametric resonance to realize resonators with engineered nonlinear dissipation over wide frequency range.

Sign in / Sign up

Export Citation Format

Share Document