Ultrafast manipulation of the weakly bound helium dimer

Kunitski, Maksim; Guan, Qingze; Maschkiwitz, Holger; Hahnenbruch, J org; Eckart, Sebastian; Zeller, S.; Kalinin, Anton; Schöffler, M. S.; Schmidt, L. Ph. H.; Jahnke, T.; Blume, D.; Dørner, R.

doi:10.1038/s41567-020-01081-3

Cited by 19 publications

(19 citation statements)

References 29 publications

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“…While Ref. [14] provided no evidence for the existence of electric field-induced bound states or hybridized states such as those predicted in Ref. [15], the experimental results clearly show that the laser-molecule coupling is strong enough to trigger measurable changes such as a clean alignment signal.…”

Section: Introductionmentioning

confidence: 72%

“…Moreover, the excellent agreement between the experimental and theoretical results in Ref. [14] suggests that the laser-molecule interaction, which included the lowest Born-Oppenheimer potential curve and assumed inertness of the electronic degrees of freedom, provides a reliable description, at least in the short-pulse regime for the intensities considered.…”

Section: Introductionmentioning

confidence: 73%

“…Working in the opposite regime of short laser pulses, a recent molecular beam experiment [14] demonstrated that a short 310fs laser pulse with an intensity of a few times 10 14 W/cm 2 can induce dissociative wave packet dynamics of the 4 He- 4 He dimer, including interferences between the l = 0 and l = 2 partial wave channels. Here, l denotes the orbital angular momentum quantum number.…”

Section: Introductionmentioning

confidence: 99%

“…The present theoretical work considers laser pulses that are longer than those utilized in Ref. [14]. As a first exploration, our theoretical framework neglects, as in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Electric-field-induced helium-helium resonances

Guan

Blume

2019

Phys. Rev. A

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The tunability of the helium-helium interaction through an external electric field is investigated. For a static external field, electric-field induced resonances and associated electric-field induced bound states are calculated for the 4 He-4 He, 3 He-4 He, and 3 He-3 He systems. Qualitative agreement is found with the literature for the 3 He-4 He and 3 He-3 He systems [E. Nielsen, D. V. Fedorov, and A. S. Jensen, Phys. Rev. Lett. 82, 2844Lett. 82, (1999]. The implications of the predicted electric-field induced resonances for 4 He-4 He on the wave packet dynamics, initiated by intense laser pulses, are investigated. Our results are expected to guide next generation experiments.PACS numbers:

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

“…The present theoretical work considers laser pulses that are longer than those utilized in Ref. [14]. As a first exploration, our theoretical framework neglects, as in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Electric-field-induced helium-helium resonances

Guan

Blume

2019

Phys. Rev. A

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“…The possibility to effectively confine these systems to one spatial dimension [21,22], where interaction effects are enhanced [23], makes ultracold atoms a promising platform to realize highly controllable strongly interacting droplets and liquids. With traditional quantum liquids such as 4 He, interatomic potentials that reproduce essentially all of their experimentally measurable properties are known accurately [24]. In deep contrast, the underlying interactions in ultracold atomic systems are highly dependent on the particular atomic species, and applied external fields, such as those involved in magnetic Feshbach resonances [25] and transversal confinement [26].…”

mentioning

confidence: 99%

Quantum liquids and droplets with low-energy interactions in one dimension

Morera,

Juliá-Díaz,

Valiente

2021

Preprint

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We consider interacting one-dimensional bosons in the universal low-energy regime. The interactions consist of a combination of attractive and repulsive parts that can stabilize quantum gases, droplets and liquids. In particular, we study the role of effective three-body repulsion, in systems with weak attractive pairwise interactions. Its low-energy description is often argued to be equivalent to a model including only two-body interactions with non-zero range. Here, we show that, at zero temperature, the equations of state in both theories agree quantitatively at low densities for overall repulsion, in the gas phase, as can be inferred from the S-matrix formulation of statistical mechanics. However, this agreement is absent in the attractive regime, where universality only occurs in the long-distance properties of quantum droplets. We develop analytical tools to investigate the properties of the theory, and obtain astounding agreement with exact numerical calculations using the density-matrix renormalization group.

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Small Helium Clusters Studied by Coulomb Explosion Imaging

Kunitski

2022

Topics in Applied Physics

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Small helium clusters consisting of two and three helium atoms are unique quantum systems in several aspects. The helium dimer has a single weakly bound state and is of huge spatial extent, such that most of its probability distribution resides outside the potential well in the classically forbidden tunnelling region. The helium trimer possesses only two vibrational states, one of which is of Efimov nature. In this chapter, we discuss application of the Coulomb explosion imaging technique for studying geometries and binding energies of these peculiar two- and three-body quantum systems. Irradiation of a helium cluster by a strong laser field allows tuning interactions between helium atoms. Such ultrashort interaction modification induces response dynamics in a cluster that is observed by combination of the imaging technique with the pump-probe approach.

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Ultrafast manipulation of the weakly bound helium dimer

Cited by 19 publications

References 29 publications

Electric-field-induced helium-helium resonances

Electric-field-induced helium-helium resonances

Quantum liquids and droplets with low-energy interactions in one dimension

Small Helium Clusters Studied by Coulomb Explosion Imaging

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