274th RQC Seminar

• 講演者

  Prof. Tim Langen
  ( TU Wien )

• 日程

  2026年5月13日(水), 11:00 - 12:00(11:00 a.m.-12:00 p.m.)

• 開催場所

  ハイブリッド（Zoom,
  345-347 Seminar Room, 3F, Main Research Building, Wako Campus / 和光地区 研究本館3階 セミナー室 (345-347) (C01))

• 講演タイトル

  Laser cooling of complex molecules for precision measurements and many-body physics

• お問合せ

  takeshi.fukuhara[at]riken.jp

講演概要
Ultracold molecules promise a wide variety of applications, ranging from precision measurement science to cold chemistry and many-body physics. A central requirement for realizing these applications is the precise control over molecules and their internal quantum states. Recent work on the cooling, trapping, and manipulation of molecules using laser cooling techniques [1] has brought this within reach, and I will present two lines of research from our group that exemplify the progress in this field.
First, I will discuss our recent demonstration of laser cooling of barium monofluoride, a promising sensor for many different types of precision measurement [2,3]. I will discuss novel cooling strategies we developed for this complex species, which open a route to tabletop tests of particle and nuclear physics and laser-cooled samples of fermionic molecules.
Second, I will present an experiment aiming at laser cooling calcium monofluoride molecules to quantum degeneracy. In this regime, the tunable dipolar interactions between molecules allow the exploration of dipolar many-body physics and the formation of new states of matter. In particular, I will highlight the possibilities that such strongly dipolar molecular systems open up for the study of supersolid states of matter, which exhibit superfluid and crystalline properties simultaneously [4,5,6].

References
1. T. Langen, G. Valtolina, D. Wang, and J. Ye, Nature Phys. 20, 702 (2024).
2. M. Rockenhäuser, F. Kogel, T. Garg, S. A. Morales-Ramírez, and T. Langen, Phys. Rev. Res. 6, 043161 (2024).
3. F. Kogel, T. Garg, M. Rockenhäuser, and T. Langen, Phys. Rev. Research 7, L022041 (2025).
4. M. Guo, F. Böttcher, J. Hertkorn, J.-N. Schmidt, M. Wenzel, H.P. Büchler, T. Langen, and T. Pfau, Nature 574, 386–389 (2019).
5. T. Langen, J. Boronat, J. Sanchez-Baena, R. Bombin, T. Karman, and F. Mazzanti Phys. Rev. Lett. 134, 053001 (2025).
6. A. Schindewolf, J. Hertkorn, I. Stevenson, M. Ciardi, P. Gross, D. Wang, T. Karman, G. Quéméner, S. Will, T. Pohl, and T. Langen. arXiv:2512.14511 (to appear in Rev. Mod. Phys.)