Hyperfine structure in the microwave spectra of ultracold polar molecules

Abstract

We investigate the microwave spectra of ultracold alkali metal dimers in magnetic, electric and combined fields, taking account of the hyperfine structure due to the nuclear spins. We consider the molecules 41K87Rb and 7Li133Cs, which are the targets of current experiments and demonstrate two extremes of large and small nuclear quadrupole coupling. We calculate the frequencies and intensities of transitions that may be used to transfer ultracold molecules between hyperfine states in a magnetic field, employing different polarizations of microwave radiation. In an electric field, the hyperfine levels display narrow avoided crossings at specific fields that we explain in terms of molecular alignment. The hyperfine splittings that arise in electric fields may hinder individual addressing in schemes to use ultracold molecules in quantum computation, but the structure of the spectra is suppressed in combined fields.

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Cited by in corpus (12)

• Condensed Matter Theory of Dipolar Quantum Gases
• Quantum Magnetism with Polar Alkali Dimers
• Ultracold polar molecules as qudits
• Controlling the Rotational and Hyperfine State of Ultracold ${}^{87}$Rb${}^{133}$Cs Molecules
• Simulating quantum magnets with symmetric top molecules
• Hyperfine structure of alkali-metal diatomic molecules
• The Hyperfine Molecular Hubbard Hamiltonian
• Toward scalable information processing with ultracold polar molecules in an electric field: a numerical investigation
• Controlling the ac Stark effect of RbCs with dc electric and magnetic fields
• The Molecular Hubbard Hamiltonian: Field Regimes and Molecular Species
• Model for the hyperfine structure of electronically-excited $\mathrm{KCs}$ molecules
• Spinor Bose-Einstein Condensates of Rotating Polar Molecules