vol. 109 | iTHES

Vol. 109, January 12th, 2016


  • Upcoming Events
  • Event report
  • Paper of the week
  • Contributions

Paper of the week

S. Yoon, F. Dalfovo, T. Nakatsukasa, G. Watanabe


"Multiple period states of the superfluid Fermi gas in an optical lattice"

From the Office

The office of iTHES assistant, Ms.Chikako Oota is situated at the second floor of the main research building, room # 246. The extension number is 3261. She will be at the office from 10 a.m. to 16 p.m.

Upcoming Events

The 8th iTHES Academic-Industrial Innovation Lecture
Date: March 1st (Tue.)
Place: Nishina Hall, Wako, RIKEN
Details to be announced.

Event report

The 14th iTHES Colloquium:
"Sparse modeling and data-driven science" by Prof. Masato Okada (University of Tokyo) was held at Okochi Hall on Jan. 7th (Thu.), 2016.
Prof. Okada introduced the research project, “Initiative for High-dimensional Data-Driven Science through Deepening of Sparse Modeling”, funded by the Grant-in-Aid for Scientific Research on Innovative Areas from MEXT (2013-2017). In the talk, Prof. Okada explained the basic concepts of the sparse modeling applied to wide range of sciences, and introduced a concrete example of sparse modeling that extracts a latent structure in electrophysiological data.

References in Japanese:
Project Home Page
Sparse modeling and data-driven science (JSAI2014)
The 3 steps for the Data-driven Materials Science

References in English
Project Home Page
Notions of Associative Memory and Sparse Coding
Sparse Modeling: Theory, Algorithms and Applications (by I.Rish and B.Brabarnik)

For more references, see here .

Person of the Week

"Multiple period states of the superfluid Fermi gas in an optical lattice"
S. Yoon, F. Dalfovo, T. Nakatsukasa, G. Watanabe
http://arxiv.org/abs/1503.07976 (New J. Phys.. 2016 in press)

We study multiple period states of a two-component unpolarized superfluid Fermi gas in an optical lattice along the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) crossover. The existence of states whose period is a multiple of the lattice spacing is a direct consequence of the non-linear behavior of the gas, which is due to the presence of the order parameter associated with superfluidity. By solving Bogoliubov-de Gennes equations we find that, in the BCS side of the crossover, the multiple period states can be energetically favorable compared to the normal Bloch states and their survival time against dynamical instability drastically increases, suggesting that these states can be accessible in current experiments, in sharp contrast to the situation in BECs.


Solving Your Scientific Identity Crisis

Franco Nori (ithes-cond team) informs us an interesting article in IOP (Institute of Physics) Physic World Magazine about solution of your scientific identity crisis.
Just follow the chart and identify who you are!