Control of resonant interaction between electronic ground and excited states

Shinya Kato*, Seiji Sugawa, Kosuke Shibata, Ryuta Yamamoto, Yoshiro Takahashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We observe magnetic Feshbach resonances in a collision between the ground and metastable states of two-electron atoms of ytterbium (Yb). We measure the on-site interaction of doubly occupied sites of an atomic Mott-insulator state in a three-dimensional optical lattice as a collisional frequency shift in a high-resolution laser spectroscopy. The observed spectra are well fitted by a simple theoretical formula, in which two particles with an s-wave contact interaction are confined in a harmonic trap. This analysis reveals a wide variation of the interaction with a resonance behavior around a magnetic field of about 1.1 G for the energetically lowest magnetic sublevel of Yb170, as well as around 360 mG for the energetically highest magnetic sublevel of Yb174. The observed Feshbach resonance can only be induced by an anisotropic interatomic interaction. This scheme will open the door to a variety of studies using two-electron atoms with tunable interaction.

Original languageEnglish
Article number173201
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 2013 Apr 23
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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