Discontinuous Growth of Solid He-4 on Graphene

作者：Koga Aaron M^*; Shibayama Yoshiyuki; Shirahama Keiya

来源：Journal of the Physical Society of Japan, 2013, 82(9): 093601.

DOI：10.7566/JPSJ.82.093601

• solid He-4
• graphene
• adsorbed solid growth
• layering transition
• two-dimensional phase transition

We have studied the growth of solid He-4 on multilayer graphene immersed in the superfluid well below the bulk freezing pressure using the torsional oscillator method at temperatures from 1.65 to 0.1 K. Below 1.2 K, the growth of one solid layer is observed as a series of discontinuous steps, each accompanied by energy dissipation. We speculate that the discontinuities result from a series of two-dimensional structural phase transitions of the uppermost solid layer, between several commensurate and incommensurate states.

• 出版日期2013-9