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Maxon and roton measurements in nanoconfined $^4$He
- Publication Year :
- 2018
- Publisher :
- arXiv, 2018.
-
Abstract
- We investigate the behavior of the collective excitations of adsorbed $^4$He in an ordered hexagonal mesopore, examining the crossover from a thin film to a confined fluid. Here we present the inelastic scattering results as a function of filling at constant temperature. We find a monotonic transition of the maxon excitation as a function of filling. This has been interpreted as corresponding to an increasing density of the adsorbed helium, which approaches the bulk value as filling increases. The roton minimum exhibits a more complicated behavior that does not monotonically approach bulk values as filling increases. The full pore scattering resembles the bulk liquid accompanied by a layer mode. The maxon and roton scattering, taken together, at intermediate fillings does not correspond to a single bulk liquid dispersion at negative, low, or high pressure.<br />Comment: 9 pages, 10 figures
- Subjects :
- Materials science
Condensed matter physics
Scattering
chemistry.chemical_element
FOS: Physical sciences
02 engineering and technology
Inelastic scattering
021001 nanoscience & nanotechnology
Roton
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
01 natural sciences
Condensed Matter - Other Condensed Matter
Condensed Matter::Soft Condensed Matter
chemistry
0103 physical sciences
Quasiparticle
Thin film
010306 general physics
0210 nano-technology
Dispersion (chemistry)
Helium
Excitation
Other Condensed Matter (cond-mat.other)
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....8778575725b652c0b66e25cc0c75d89a
- Full Text :
- https://doi.org/10.48550/arxiv.1805.04188