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Seminars & Lectures

* TITLE

Unified theories on the magnetism and on the critical Casimir force

* SPEAKERS

Name	Affiliation	E-mail
Shyamal Biswas	Indian Institute of Technology

* HOST(Applicant)

Name	Affiliation	E-mail
Gentaro Watanabe	APCTP	gentaro_watanabe(at)apctp.org

* DATE / TIME

2013-07-29, 4PM

* PLACE

503 Conference Room

* ABSTRACT

We will pedagogically explore Pauli paramagnetism, Landau diamagnetism and de Haas-van Alphen effect in a single framework for an ideal gas of electrons, and unify these three effects for all temperatures and fields. Then we will switch to a technical work on the critical Casimir force on the He-4 film. That the confinement of critical fluctuations around the lambda point gives rise to a (critical) Casimir force, which causes the thinning of the film, was investigated experimentally by Garcia and Chan [PRL 83, 1187 (1999)] and by Ganshin_et al_ [PRL 97, 075301 (2006)]. We will present a unified theory for the critical Casimir force below and above of the lambda point in a single frame work. Our result goes beyond the previous mean field result [Zandi _et al_, PRE 76, 030601(R) (2007)], and compares favorably with the numerical simulation [Hucht, PRL 99, 185301 (2007)] and with the experimental data.

References:
S. Biswas, S. Sen, and D. Jana , _A complete theory for the magnetism of an ideal gas of electrons_ , Phys. Plasmas 20, 052503 (2013)
S. Biswas, J.K. Bhattacharjee, H.S. Samanta, S. Bhattacharyya, and B. Hu, _The critical Casimir force in the superfluid phase: effect of fluctuations_ , New J. Phys. 12, 063039 (2010)

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