Phys. Rev. Lett. 64, 1126–1129 (1990)Collective excitations of helium clustersReceived 27 December 1989; published in the issue dated 5 March 1990 The excitation spectra of compressional modes of 4HeN, N=20, 70, and 240, clusters at 0 K are calculated by treating the cluster as a quantum liquid drop. The spectrum of N=240 strongly resembles that of liquid helium with a visible roton structure, while for N=20 no roton minimum is seen and N=70 shows a weak minimum. Implications of these findings for superfluidity in helium clusters are discussed. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.1126
DOI:
10.1103/PhysRevLett.64.1126
PACS:
67.40.Mj, 05.30.Jp, 36.40.+d, 67.90.+z
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