Abstract
The spectrum of rotons in two-dimensional liquid helium II is estimated within the Bijl-Feynman theory. Due to stronger short-range order and more effective back flow, the roton gap Δ is found to be about half as big as the bulk roton energy.
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Supported by grants of the Deutsche Forschungsgemeinschaft and, in part, by the U.S. National Science Foundation through Grants DMR73-02363 and DMR72-02977 A03.
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Götze, W., Lücke, M. A comment on rotons in two-dimensional liquid helium II. J Low Temp Phys 25, 671–676 (1976). https://doi.org/10.1007/BF00657290
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DOI: https://doi.org/10.1007/BF00657290