Helium Adsorption on Lithium Substrates

Cleve, E. Van; Taborek, P.; Rutledge, J. E.

doi:10.1007/s10909-007-9516-5

Cited by 26 publications

(19 citation statements)

References 29 publications

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“…Finally, a solid crystalline target offers a means to further reduce the threshold phonon energy required to evaporate helium atoms. 4 He is very weakly bound to the alkali metals, with an adsorption energy ranging from 1.2 meV for lithium [56] to 0.33 meV for cesium [57][58][59]. The binding energy for 3 He is even less, being only 0.17 meV on cesium [60].…”

mentioning

confidence: 99%

“…If a film of Cs no more than a few monolayers thick were deposited on a target crystal, followed by a monolayer of helium, the likely consequence is that energy within the phonon system would be transferred to the surface and lead to helium evaporation. The deposition of the reactive alkalis adds complexity to any low temperature experiment, but it has been successfully demonstrated in a variety of different circumstances [56,60,61].…”

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confidence: 99%

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Dark Matter Detection Using Helium Evaporation and Field Ionization

2017

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We describe a method for dark matter detection based on the evaporation of helium atoms from a cold surface and their subsequent detection using field ionization. When a dark matter particle scatters off a nucleus of the target material, elementary excitations (phonons or rotons) are produced. Excitations which have an energy greater than the binding energy of helium to the surface can result in the evaporation of helium atoms. We propose to detect these atoms by ionizing them in a strong electric field. Because the binding energy of helium to surfaces can be below 1 meV, this detection scheme opens up new possibilities for the detection of dark matter particles in a mass range down to 1 MeV/c^{2}.

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confidence: 99%

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Dark Matter Detection Using Helium Evaporation and Field Ionization

2017

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“…The technology used for depositing films of cesium and rubidium (thermal evaporation from a resistively heated, infrared shielded oven) does not work well for lithium because the required temperatures are too high. We have implemented a pulsed laser deposition (PLD) technique which ablates a lithium target using nanosecond pulses of green light in vacuum at low temperature [45]. A typical isotherm of 4 He on lithium is shown in Fig.…”

Section: Interactions With Superfluiditymentioning

confidence: 99%

“…On lithium, the helium film grows in a continuous way, with the thickness approximately proportional to the pressure. The slope of the linear part of the isotherm can be used to determine the binding energy, which is 13.7 K [45]. At 900 mK, there is a clear KT-type superfluid transition which occurs at a total thickness of approximately Fig.…”

Section: Interactions With Superfluiditymentioning

confidence: 99%

Wetting, Prewetting and Superfluidity

Taborek

2009

J Low Temp Phys

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Experiments on adsorption and wetting of quantum fluids ( 4 He and 3 He) on weakly binding alkali metal substrates are reviewed. Helium on weak substrates can undergo a variety of phase transitions including wetting, prewetting, layering, and liquid-vapor transitions. Another characteristic feature of weak substrates is the absence of an immobile quasi solid layer which is present on all conventional strong substrates. Both the absence of the immobile layer and the interaction with surface phase transitions can strongly affect superfluid onset. The Kosterlitz-Thouless superfluid transition can terminate in either a critical endpoint where it meets a first order structural transition or a tricritical point where it meets critical point such as the prewetting critical point or the 2D liquid-vapor critical point.

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“…The exact value of d c itself, which we find to be on the order of several hundred Angstroms, depends on material characteristics such as band gap, quasiparticle velocity, strain and doping level. Experimental confirmation of these effects would involve the measurement of adsorbed film thickness using standard quartz microbalance [10,51] or interferometry [14] techniques. The ability to electronically or mechanically manipulate free-standing atomically flat substrates opens up the possibility of producing an exotic quantum wetting phase transition driven by a non-thermal control parameter.…”

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Theory of Liquid Film Growth and Wetting Instabilities on Graphene

et al. 2018

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We investigate wetting phenomena near graphene within the Dzyaloshinskii-Lifshitz-Pitaevskii theory for light gases of hydrogen, helium, and nitrogen in three different geometries where graphene is either affixed to an insulating substrate, submerged or suspended. We find that the presence of graphene has a significant effect in all configurations. When placed on a substrate, the polarizability of graphene can increase the strength of the total van der Waals force by a factor of 2 near the surface, enhancing the propensity towards wetting. In a suspended geometry unique to two-dimensional materials, where graphene is able to wet on only one side, liquid film growth becomes arrested at a critical thickness, which may trigger surface instabilities and pattern formation analogous to spinodal dewetting. The existence of a mesoscopic critical film with a tunable thickness provides a platform for the study of a continuous wetting transition, as well as the engineering of custom liquid coatings. These phenomena are robust to some mechanical deformations and are also universally present in doped graphene and other two-dimensional materials, such as monolayer dichalcogenides.

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Helium Adsorption on Lithium Substrates

Cited by 26 publications

References 29 publications

Dark Matter Detection Using Helium Evaporation and Field Ionization

Dark Matter Detection Using Helium Evaporation and Field Ionization

Wetting, Prewetting and Superfluidity

Theory of Liquid Film Growth and Wetting Instabilities on Graphene

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