CMSP Seminar (Atomistic Simulation Seminar Series) 5 June, 15:00hrs, by Dr Ali Naji

[CMSP Seminars Secretariat]

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CMSP Seminar (Atomistic Simulation Seminar Series)
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*Wednesday, 5 June 2024, 15:00 hrs*
*/In-person only:/*
*/Luigi Stasi Seminar Room (Leonardo Building, first floor)/*/
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<https://zoom.us/meeting/register/tJIoc-qoqD4vEtEfD_0unPiCeW3yLn6AmKfQ> /

Speaker:*  Ali Naji * (Institute for Research in Fundamental Sciences)

Title: *Highly tunable Casimir forces mediated by ferrofluids subject to 
external field*

Abstract:

Ferrofluids are stabilized suspensions of superparamagnetic 
nanoparticles in a nonmagnetic liquid. They have emerged as an important 
class of materials with tunable properties, making them relevant also to 
the control of Casimir effect in small-scale applications. The Casimir 
effect arises from omnipresent quantum vacuum fluctuations, leading to 
ubiquitous attractive forces between material bodies. We discuss how 
different properties of ferrofluids, such as their restructuring and 
anisotropic response to an applied magnetic field, can be utilized to 
tune the sign of the Casimir force between dielectric substrates as well 
as its magnitude across a striking range spanning several decades. We 
also report on a peculiar cancellation of the contributions from nonzero 
Matsubara modes deep into the retarded range of distances; an effect 
that can be interpreted as an emergent classical limit where the 
built-in quantum relativistic signature of the Casimir effect is 
effectively ‘switched off’.

http://www.ictp.it/research/cmsp.aspx

The Abdus Salam International Centre for Theoretical Physics
https://www.ictp.it/

    
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