Anisotropic polarizability of erbium atoms

Abstract

We report on the determination of the dynamical polarizability of ultracold erbium atoms in the ground and in one excited state at three different wavelengths, which are particularly relevant for optical trapping. Our study combines experimental measurements of the light shift and theoretical calculations. In particular, our experimental approach allows us to isolate the different contributions to the polarizability, namely the isotropic scalar and anisotropic tensor part. For the latter contribution, we observe a clear dependence of the atomic polarizability on the angle between the laser-field-polarization axis and the quantization axis, set by the external magnetic field. Such an angle-dependence is particularly pronounced in the excited-state polarizability. We compare our experimental findings with the theoretical values, based on semi-empirical electronic-structure calculations and we observe a very good overall agreement. Our results pave the way to exploit the anisotropy of the tensor polarizability for spin-selective preparation and manipulation.

References in corpus (12)

• Many-Body Physics with Ultracold Gases
• Bose-Einstein Condensation of Erbium
• Quantum degenerate dipolar Fermi gas
• Degenerate Fermi Gases of Ytterbium
• Homogeneous Atomic Fermi Gases
• Anisotropic Polarizability of Ultracold Polar ${}^{40}$K${}^{87}$Rb Molecules
• Site-resolved imaging of ytterbium atoms in a two-dimensional optical lattice
• Spin-dependent Optical Superlattice
• AC Stark Effect in Ultracold Polar RbCs Molecules
• Anisotropic dependence of tune-out wavelength near Dy 741-nm transition
• Probing the axis alignment of an ultracold spin-polarized ${\text{Rb}}_2$ molecule
• Accumulation of chromium metastable atoms into an Optical Trap

Cited by in corpus (25)

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• Observation of a narrow inner-shell orbital transition in atomic erbium at 1299 nm
• Casimir-Polder force and torque for anisotropic molecules close to conducting planes and their effects on CO${}_2$
• Optical Tweezer Arrays of Erbium Atoms
• Spectroscopy of Rydberg States in Erbium using Electromagnetically Induced Transparency
• Ramsey imaging of optical traps
• Characterisation of three-body loss in ${}^{166}$Er and optimised production of large Bose-Einstein condensates
• Measurement of the dynamic polarizability of Dy atoms near the 626-nm intercombination line
• Losses of thulium atoms from optical dipole traps operating at 532 and 1064 nm
• New opportunites for interactions and control with ultracold lanthanides
• Radio-frequency evaporation in an optical dipole trap
• Creation of a degenerate Bose-Bose mixture of erbium and lithium atoms
• Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance
• Multi-state interferometric measurement of nonlinear AC Stark shift
• Forces on alkali Rydberg atoms due to non-linearly polarized light
• Blue repulsive potential for dysprosium Bose-Einstein condensates
• Narrowline cooling of dysprosium atoms in an optical tweezer array
• Experimental study of tune-out wavelengths for spin-dependent optical lattice in ${}^{87}$Rb Bose-Einstein condensation
• Tune-out wavelength for the thulium atom near 576 nm
• Dissipationless tune-out trapping for a lanthanide-alkali quantum gas mixture
• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms
• Atomic Observables Induced by Cosmic Fields