Control of Resonant Interaction between Electronic Ground and Excited States

Kato, S.; Sugawa, Seiji; Shibata, Kosuke; Yamamoto, Ryuta; Takahashi, Yoshiro

doi:10.1103/physrevlett.110.173201

Cited by 50 publications

(62 citation statements)

References 29 publications

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“…3 are representative of typical behavior, rather than specific predictions for individual isotopes. Signatures of chaos emerge at somewhat different fields for different cases, but are always strongly present for fields over 600 G. These signatures will be observable if current experiments on Feshbach resonances in Yb( 1 S 0 )+Yb( 3 P 2 ) [20,21] can be extended to suitable magnetic fields.…”

Section: Resultsmentioning

confidence: 90%

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Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)
Green
¹
,
Vaillant
²
,
Frye
³

et al. 2016
Phys. Rev. A
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We calculate and analyze Feshbach resonance spectra for ultracold Yb( 1 S0) + Yb( 3 P2) collisions as a function of an interatomic potential scaling factor λ and external magnetic field. We show that, at zero field, the resonances are distributed randomly in λ, but that signatures of quantum chaos emerge as a field is applied. The random zero-field distribution arises from superposition of structured spectra associated with individual total angular momenta. In addition, we show that the resonances in magnetic field in the experimentally accessible range 400 to 2000 G are chaotically distributed, with strong level repulsion that is characteristic of quantum chaos.

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Section: Resultsmentioning

confidence: 90%

“…Takahashi and coworkers have measured Feshbach resonances in this system [20,21], and we discuss how the signatures of quantum chaos could be observed with current experimental capabilities.…”

Section: Introductionmentioning

confidence: 99%

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)
Green
¹
,
Vaillant
²
,
Frye
³

et al. 2016
Phys. Rev. A
16
2
11
0
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“…For these atoms, anisotropy in an electrostatic van der Waals potentials with non-zero electronic orbital angular momenta as well as dipole-dipole interactions induces couplings between an open channel and many closed channels with higher partial waves, leading to an extremely high density of FRs [17]. In the present case of the collision between the 1 S 0 and 3 P 2 states of Yb atoms, anisotropy originates purely form the van der Waals interaction with an orbital angular momentum [18].We start from the results of trap loss spectroscopy. Figure 1 (a) shows the relevant energy diagram and the experimental sequence.…”

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confidence: 77%

Feshbach-Resonance-Enhanced Coherent Atom-Molecule Conversion with Ultranarrow Photoassociation Resonance

et al. 2016

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We reveal the existence of high-density Feshbach resonances in the collision between the ground and metastable states of 171 Yb and coherently produce the associated Feshbach molecules by photoassociation. The extremely small transition rate is overcome by the enhanced Franck-Condon factor of the weakly bound Feshbach molecule, allowing us to observe Rabi oscillations with long decay time between an atom pair and a molecule in an optical lattice. We also perform the precision measurement of the binding energies, which characterizes the observed resonances. The ultra-narrow photoassociation will be a basis for practical implementation of optical Feshbach resonances. [2][3][4], the initial step to form an ultracold, ro-vibronic ground state of (polar) molecules [5,6], correlation measurements for ultracold atoms in an optical lattice [7][8][9], and so on. Photoassociation (PA) is another standard method to generate ultracold molecules which can create various molecules in electronic excited states with a simple optical excitation. [10]. However, the transition probability is never large enough even for a strong electric-dipole allowed (E1) transition due to small overlap between the wave functions of free atoms and molecular bound states, resulting in small FranckCondon factors. In addition, the radiative lifetime of the created molecular states is usually quite short for an E1 transition. As a consequence, coherent production of molecules by one-color PA has been impossible until recent demonstration with a BEC of 88 Sr [11], where the narrow 1 S 0 ↔ 3 P 1 transition was exploited.In this Letter, we report on photoassociative creation of ultracold molecules associated with the ground 1 S 0 and long-lived metastable 3 P 2 states of 171 Yb with a radiative lifetime of longer than one second. Importantly, the otherwise quite small strength of the PA resonance is significantly enhanced by working around FRs for the closed channel. This enables us to demonstrate Rabi oscillations in the PA transition with a lifetime reaching hundreds of microseconds. Moreover, by using this narrow-line PA, observed FRs are characterized by precise measurement of the binding energies of near-threshold Fesbach molecules. Our observation of the strong PA line with a long expected radiative lifetime opens up the possibility to suppress atom loss in optical Feshbach resonances [11][12][13].First, we describe our observation of FRs in collisions between 1 S 0 and 3 P 2 states of 171 Yb, which is an important basis in this work. Most of the currently studied FRs are for alkali atoms, which originate from their hyperfine structures with isotropic van der Waals interactions. On the other hand, the emergence of FRs associated with the existence of anisotropic interactions was recently predicted [14] and observed in collisions of Er [15] and Dy [16]. For these atoms, anisotropy in an electrostatic van der Waals potentials with non-zero electronic orbital angular momenta as well as dipole-dipole interactions induces couplings between an open cha...

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“…This renders their use in magnetoassociation very difficult, if not impossible. A different kind of FR for a closed-shell/open-shell mixture has recently been observed, with one of the atoms in an electronically excited state [20,21]. In this case, the FR is induced by the anisotropy of the interaction between S-state and P -state atoms.…”

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confidence: 99%

Controlling Magnetic Feshbach Resonances in Polar Open-Shell Molecules with Nonresonant Light

et al. 2014

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Magnetically tunable Feshbach resonances for polar paramagnetic ground-state diatomics are too narrow to allow for magnetoassociation starting from trapped, ultracold atoms. We show that nonresonant light can be used to engineer the Feshbach resonances in their position and width. For non-resonant field intensities of the order of 10 9 W/cm 2 , we find the width to be increased by three orders of magnitude, reaching a few Gauss. This opens the way for producing ultracold molecules with sizeable electric and magnetic dipole moments and thus for many-body quantum simulations with such particles.PACS numbers: 34.50. Cx,34.50.Rk, Ultracold polar molecules are predicted to probe fundamental physics [1] and realize a wealth of many-body phenomena such as exotic quantum phases [2]. They are thus attracting significant interest in both the AMO and condensed matter communities [3]. Polar alkali dimers have already been produced in their absolute internal ground state close to quantum degeneracy [4], opening the way toward ultracold chemistry [5,6] and quantum simulation [7]. Contrary to ground-state alkali dimers which are closed-shell, diatomics consisting of an open-shell and a closed-shell atom possess an unpaired electron, endowing the molecule with spin structure and a significant magnetic dipole moment. Since these molecules have both electric and magnetic dipoles, they are supreme candidates for creating topologically ordered states [8], investigating collective spin excitations [9] and realizing lattice-spin models [7]. While numerous ultracold mixtures of open-shell alkali and closedshell Yb or Sr atoms have already been studied experimentally [10][11][12][13][14][15], magnetoassociating the atoms into molecules has remained an elusive goal.The most successful and widely used routes to producing ultracold dimers utilize magnetically tunable Feshbach resonances (FRs) [16,17] where the hyperfine interaction couples a scattering state to a bound molecular level. Somewhat unexpectedly, FRs have been predicted for diatomics with a 2 Σ ground electronic state such as RbSr and LiYb [18,19]. The resonances are caused by a modification of the alkali atom's hyperfine structure due to the presence of the other atom [18] or by creating a hyperfine coupling due to the alkali atom polarizing the nuclear spin density of fermionic Yb [19]. However, the width of these resonances does not exceed a few milli-Gauss. This renders their use in magnetoassociation very difficult, if not impossible. A different kind of FR for a closed-shell/open-shell mixture has recently been observed, with one of the atoms in an electronically excited state [20,21]. In this case, the FR is induced by the anisotropy of the interaction between S-state and P -state atoms. Due to the finite excited state lifetime, such a FR is not ideally suited for making molecules. It suggests, however, to harness an anisotropic interaction for magnetoassociation.Here we show that non-resonant light, which universally couples to the polarizability anisotropy of a molecu...

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Control of Resonant Interaction between Electronic Ground and Excited States

Cited by 50 publications

References 29 publications

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)
Green
¹
,
Vaillant
²
,
Frye
³

et al. 2016
Phys. Rev. A
16
2
11
0
View full text Add to dashboard Cite

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)
Green
¹
,
Vaillant
²
,
Frye
³

et al. 2016
Phys. Rev. A
16
2
11
0
View full text Add to dashboard Cite

Feshbach-Resonance-Enhanced Coherent Atom-Molecule Conversion with Ultranarrow Photoassociation Resonance

Controlling Magnetic Feshbach Resonances in Polar Open-Shell Molecules with Nonresonant Light

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Control of Resonant Interaction between Electronic Ground and Excited States

Cited by 50 publications

References 29 publications

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)Green1, Vaillant2, Frye3 et al. 2016Phys. Rev. A162110View full textAdd to dashboardCite

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)Green1, Vaillant2, Frye3 et al. 2016Phys. Rev. A162110View full textAdd to dashboardCite

Feshbach-Resonance-Enhanced Coherent Atom-Molecule Conversion with Ultranarrow Photoassociation Resonance

Controlling Magnetic Feshbach Resonances in Polar Open-Shell Molecules with Nonresonant Light

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Product

Resources

About

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)
Green
¹
,
Vaillant
²
,
Frye
³

et al. 2016
Phys. Rev. A
16
2
11
0
View full text Add to dashboard Cite

Quantum chaos in ultracold collisions betweenYb(1S0)andYb(3P2)
Green
¹
,
Vaillant
²
,
Frye
³

et al. 2016
Phys. Rev. A
16
2
11
0
View full text Add to dashboard Cite