# Erlangen 2018 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# Q: Fachverband Quantenoptik und Photonik

## Q 36: Ultracold Molecules

### Q 36.5: Vortrag

### Dienstag, 6. März 2018, 15:00–15:15, K 2.013

**Coherent manipulations of rotational states of 23Na40K molecules in a 1D optical lattice** — •Xinyu Luo^{1}, Frauke Seeßelberg^{1}, Ming Li^{3}, Scott Eustice^{1}, Svetlana Kotochigova^{3}, Immanuel Bloch^{1,2}, and Christoph Gohle^{1} — ^{1}Max-PlanckInstitut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — ^{2}Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany — ^{3}Department of Physics, Temple University, Philadelphia, PA 19122-6082, USA

Ultracold polar molecule gases, promising strong electric dipole-dipole interaction and a long lifetime in a 3D optical lattice, are good candidates for investigating many-body physics with long-range interactions. Rotational states of these molecules with opposite parity offer strong dipole-dipole interaction. They can thus be used to simulate long range interaction beyond nearest-neighbor interaction even in a deep lattice. To leverage the rotational degree of freedom in a spatially inhomogeneous optical lattice, however, one needs to deal with a light intensity dependent differential AC Stark shift between rotational states. Trap field polarization can be used to cancel it to first order. Here we show that the remaining high order differential AC Stark shift of 23Na40K molecule can be reduced significantly when the nuclear spin is decoupled from the molecular rotation by applying a DC electric field. Therefore the single particle dephasing of the rotating dipoles would be significantly reduced. Our work paves the way to observe interaction effect by Ramsey interferometery of molecules without dynamical decoupling.