arXiv:2006.06456 · Physical Review A

Feshbach resonances in an erbium-dysprosium dipolar mixture

Gianmaria Durastante, Claudia Politi, Maximilian Sohmen, P. Ilzhöfer, Manfred J. Mark, Matthew A. Norcia, Francesca Ferlaino

Published Sep 21, 2020• 55 citations

arXiv HTML PDF

Abstract

We report on the observation of heteronuclear magnetic Feshbach resonances in several isotope mixtures of the highly magnetic elements erbium and dysprosium. Among many narrow features, we identify two resonances with a width greater than one Gauss. We characterize one of these resonances, in a mixture of $^{168}\mathrm{Er}$ and $^{164}\mathrm{Dy}$, in terms of loss rates and elastic cross section, and observe a temperature dependence of the on-resonance loss rate suggestive of a universal scaling associated with broad resonances. Our observations hold promise for the use of such a resonance for tuning the interspecies scattering properties in a dipolar mixture. We further compare the prevalence of narrow resonances in an $^{166}\mathrm{Er}\ensuremath{-}^{164}\mathrm{Dy}$ mixture to the single-species case, and observe an increased density of resonances in the mixture.

DOI: 10.1103/physreva.102.033330

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arXiv:2006.06456 · Physical Review A

Feshbach resonances in an erbium-dysprosium dipolar mixture

Gianmaria Durastante, Claudia Politi, Maximilian Sohmen, P. Ilzhöfer, Manfred J. Mark, Matthew A. Norcia, Francesca Ferlaino

Published Sep 21, 2020• 55 citations

arXiv HTML PDF

Abstract

^{168}\mathrm{Er}

and

^{164}\mathrm{Dy}

, in terms of loss rates and elastic cross section, and observe a temperature dependence of the on-resonance loss rate suggestive of a universal scaling associated with broad resonances. Our observations hold promise for the use of such a resonance for tuning the interspecies scattering properties in a dipolar mixture. We further compare the prevalence of narrow resonances in an

^{166}\mathrm{Er}\ensuremath{-}^{164}\mathrm{Dy}

mixture to the single-species case, and observe an increased density of resonances in the mixture.

DOI: 10.1103/physreva.102.033330

Related papers

Feshbach resonances of large-mass-imbalance Er-Li mixtures

F. Schäfer, N. Mizukami, Yoshiro Takahashi

We report on the experimental observation of Feshbach resonances in large-mass-imbalance mixtures of erbium (Er) and lithium (Li). All combinations of $^{168}\mathrm{Er}, ^{166}\mathrm{Er}$ , and $^{7}\mathrm{Li}, ^{6}\mathrm{Li}$ are cooled to temperatures of a few microkelvin, partially by means of sympathetic cooling together with ytterbium (Yb) as a third mixture component. The Er-Li inelastic interspecies collisional properties are studied for magnetic fields up to $680\phantom{\rule{0.28em}{0ex}}\mathrm{G}$ . In all cases, resonant interspecies loss features, indicative of Feshbach resonances, have been observed. While most resonances have sub-Gauss widths, a few of them are broad and feature widths of several Gauss. Those broad resonances are a key to the realization of ultracold Er-Li quantum gas mixtures with tunable interactions.We report on the experimental observation of Feshbach resonances in large-mass-imbalance mixtures of erbium (Er) and lithium (Li). All combinations of $^{168}\mathrm{Er}, ^{166}\mathrm{Er}$, and $^{7}\mathrm{Li}, ^{6}\mathrm{Li}$ are cooled to temperatures of a few microkelvin, partially by means of sympathetic cooling together with ytterbium (Yb) as a third mixture component. The Er-Li inelastic interspecies collisional properties are studied for magnetic fields up to $680\phantom{\rule{0.28em}{0ex}}\mathrm{G}$. In all cases, resonant interspecies loss features, indicative of Feshbach resonances, have been observed. While most resonances have sub-Gauss widths, a few of them are broad and feature widths of several Gauss. Those broad resonances are a key to the realization of ultracold Er-Li quantum gas mixtures with tunable interactions.

arXiv:2111.08130Physical Review AJan 24, 202222 citations

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We present our experimental investigation of the interspecies Feshbach spectrum in a mixture of ${}^{167}$ Er( $F = 19/2, m_F = -19/2$ )- ${}^6$ Li( $F = 1/2, m_F = 1/2$ ) atoms in the microkelvin temperature regime. These temperatures are achieved by means of sympathetic cooling with ${}^{174}$ Yb as a third species. Interspecies Feshbach resonances are then identified by investigation of the Er-Li inelastic collisional properties for magnetic fields up to 800 G. Numerous narrow resonances as well as six resonances with widths above 1 G could be identified. It is these broader resonances that hold much promise for interesting future investigations of, for exmample, novel superfluid states and Efimov states in large mass-imbalanced, all-fermionic two-component systems.We present our experimental investigation of the interspecies Feshbach spectrum in a mixture of ${}^{167}$Er($F = 19/2, m_F = -19/2$)-${}^6$Li($F = 1/2, m_F = 1/2$) atoms in the microkelvin temperature regime. These temperatures are achieved by means of sympathetic cooling with ${}^{174}$Yb as a third species. Interspecies Feshbach resonances are then identified by investigation of the Er-Li inelastic collisional properties for magnetic fields up to 800 G. Numerous narrow resonances as well as six resonances with widths above 1 G could be identified. It is these broader resonances that hold much promise for interesting future investigations of, for exmample, novel superfluid states and Efimov states in large mass-imbalanced, all-fermionic two-component systems.

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Loss features in ultracold $^{162}$ Dy gases: two- versus three-body processesLoss features in ultracold $^{162}$Dy gases: two- versus three-body processes

Maxime Lecomte, Alexandre Journeaux, Renaud, Loan +2 more

Dipolar gases like erbium and dysprosium have a dense spectrum of resonant loss features associated with their strong anisotropic interaction potential. These resonances display various behaviours with density and temperature, implying diverse microscopic properties. Here, we quantitatively investigate the low-field ( $B < 6\,\text{G}$ ) loss features in ultracold thermal samples of $^{162}$ Dy, revealing two- and three-body dominated loss processes. We investigate their temperature dependence and detect a feature compatible with a $d$ -wave Fano-Feshbach resonance, which has not been observed before. We also analyse the expansion of the dipolar Bose-Einstein condensate as a function of the magnetic field and interpret the changes in size close to the resonances with a variation in the scattering length.Dipolar gases like erbium and dysprosium have a dense spectrum of resonant loss features associated with their strong anisotropic interaction potential. These resonances display various behaviours with density and temperature, implying diverse microscopic properties. Here, we quantitatively investigate the low-field ($B < 6\,\text{G}$) loss features in ultracold thermal samples of $^{162}$Dy, revealing two- and three-body dominated loss processes. We investigate their temperature dependence and detect a feature compatible with a $d$-wave Fano-Feshbach resonance, which has not been observed before. We also analyse the expansion of the dipolar Bose-Einstein condensate as a function of the magnetic field and interpret the changes in size close to the resonances with a variation in the scattering length.

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Broad universal Feshbach resonances in the chaotic spectrum of dysprosium atoms

T. Maier, Igor Ferrier-Barbut, Holger Kadau +6 more

We report on the observation of weakly bound dimers of bosonic dysprosium with a strong universal $s$ -wave halo character, associated with broad magnetic Feshbach resonances. These states surprisingly decouple from the chaotic background of narrow resonances, persisting across many such narrow resonances. In addition they show the highest reported magnetic moment $\ensuremath{\mu}\ensuremath{\simeq}20{\ensuremath{\mu}}_{\mathrm{B}}$ of any ultracold molecule. We analyze our findings using a coupled-channel theory taking into account the short range van der Waals interaction and a correction due to the strong dipole moment of dysprosium. We are able to extract the scattering length as a function of magnetic field associated with these resonances and obtain a background scattering length ${a}_{\mathrm{bg}}=91(16)\phantom{\rule{0.16em}{0ex}}{a}_{0}$ . These results offer prospects of a tunability of the interactions in dysprosium, which we illustrate by observing the saturation of three-body losses.We report on the observation of weakly bound dimers of bosonic dysprosium with a strong universal $s$-wave halo character, associated with broad magnetic Feshbach resonances. These states surprisingly decouple from the chaotic background of narrow resonances, persisting across many such narrow resonances. In addition they show the highest reported magnetic moment $\ensuremath{\mu}\ensuremath{\simeq}20{\ensuremath{\mu}}_{\mathrm{B}}$ of any ultracold molecule. We analyze our findings using a coupled-channel theory taking into account the short range van der Waals interaction and a correction due to the strong dipole moment of dysprosium. We are able to extract the scattering length as a function of magnetic field associated with these resonances and obtain a background scattering length ${a}_{\mathrm{bg}}=91(16)\phantom{\rule{0.16em}{0ex}}{a}_{0}$. These results offer prospects of a tunability of the interactions in dysprosium, which we illustrate by observing the saturation of three-body losses.

arXiv:1506.01875Physical Review ADec 14, 201576 citations

^{168}\mathrm{Er}

and

^{164}\mathrm{Dy}

^{166}\mathrm{Er}\ensuremath{-}^{164}\mathrm{Dy}

mixture to the single-species case, and observe an increased density of resonances in the mixture.

We report on the experimental observation of Feshbach resonances in large-mass-imbalance mixtures of erbium (Er) and lithium (Li). All combinations of

^{168}\mathrm{Er}, ^{166}\mathrm{Er}

, and

^{7}\mathrm{Li}, ^{6}\mathrm{Li}

are cooled to temperatures of a few microkelvin, partially by means of sympathetic cooling together with ytterbium (Yb) as a third mixture component. The Er-Li inelastic interspecies collisional properties are studied for magnetic fields up to

680\phantom{\rule{0.28em}{0ex}}\mathrm{G}

. In all cases, resonant interspecies loss features, indicative of Feshbach resonances, have been observed. While most resonances have sub-Gauss widths, a few of them are broad and feature widths of several Gauss. Those broad resonances are a key to the realization of ultracold Er-Li quantum gas mixtures with tunable interactions.

Three magnetic-field induced heteronuclear Feshbach resonances were identified in collisions between bosonic

^{87}\mathrm{R}\mathrm{b}

and fermionic

^{40}\mathrm{K}

atoms in their absolute ground states. Strong inelastic loss from an optically trapped mixture was observed at the resonance positions of 492, 512, and $543\ifmmode\pm\else\textpm\fi{}2\text{ }\text{ }\mathrm{G}$. The magnetic-field locations of these resonances place a tight constraint on the triplet and singlet cross-species scattering lengths, yielding $(\ensuremath{-}281\ifmmode\pm\else\textpm\fi{}15){a}_{0}$ and $(\ensuremath{-}54\ifmmode\pm\else\textpm\fi{}12){a}_{0}$, respectively. The width of the loss feature at 543 G is $3.7\ifmmode\pm\else\textpm\fi{}1.5\text{ }\text{ }\mathrm{G}$ wide; this broad Feshbach resonance should enable experimental control of the interspecies interactions.

We present our experimental investigation of the interspecies Feshbach spectrum in a mixture of

{}^{167}

Er(

F = 19/2, m_F = -19/2

{}^6

Li(

F = 1/2, m_F = 1/2

) atoms in the microkelvin temperature regime. These temperatures are achieved by means of sympathetic cooling with

{}^{174}

Yb as a third species. Interspecies Feshbach resonances are then identified by investigation of the Er-Li inelastic collisional properties for magnetic fields up to 800 G. Numerous narrow resonances as well as six resonances with widths above 1 G could be identified. It is these broader resonances that hold much promise for interesting future investigations of, for exmample, novel superfluid states and Efimov states in large mass-imbalanced, all-fermionic two-component systems.

Loss features in ultracold

^{162}

Dy gases: two- versus three-body processes

B < 6\,\text{G}

) loss features in ultracold thermal samples of

^{162}

Dy, revealing two- and three-body dominated loss processes. We investigate their temperature dependence and detect a feature compatible with a

d

-wave Fano-Feshbach resonance, which has not been observed before. We also analyse the expansion of the dipolar Bose-Einstein condensate as a function of the magnetic field and interpret the changes in size close to the resonances with a variation in the scattering length.

We report on the observation of weakly bound dimers of bosonic dysprosium with a strong universal

s

-wave halo character, associated with broad magnetic Feshbach resonances. These states surprisingly decouple from the chaotic background of narrow resonances, persisting across many such narrow resonances. In addition they show the highest reported magnetic moment $\ensuremath{\mu}\ensuremath{\simeq}20{\ensuremath{\mu}}_{\mathrm{B}}$ of any ultracold molecule. We analyze our findings using a coupled-channel theory taking into account the short range van der Waals interaction and a correction due to the strong dipole moment of dysprosium. We are able to extract the scattering length as a function of magnetic field associated with these resonances and obtain a background scattering length

{a}_{\mathrm{bg}}=91(16)\phantom{\rule{0.16em}{0ex}}{a}_{0}

. These results offer prospects of a tunability of the interactions in dysprosium, which we illustrate by observing the saturation of three-body losses.