Volume 118, Number 6, June 2017
|Number of page(s)
|Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
|22 August 2017
Subharmonic phonon-ripplon coupling in the 2D Wigner solid on superfluid helium
Institute for Low Temperature Physics and Engineering - 47 Nauky Ave., 61103 Kharkiv, Ukraine
Received: 2 April 2017
Accepted: 28 July 2017
The nonlinear response of the liquid-helium surface to the oscillating motion of a two-dimensional electron solid is analyzed. In the nonlinear regime, we found that the effective mass of surface dimples formed under electrons behaves as a singular odd function near subharmonics of the frequency of a ripplon whose wave vector coincides with a reciprocal-lattice vector. This unexpected behavior of the dimple mass is shown to lead to the appearance of new longitudinal phonon-ripplon coupled modes. It also affects in a nontrivial way positions of conventional phonon-ripplon coupled modes. Both these theoretical results explain experimental observations reported previously.
PACS: 73.40.-c – Electronic transport in interface structures / 73.20.-r – Electron states at surfaces and interfaces / 67.90.+z – Other topics in quantum fluids and solids (restricted to new topics in section 67)
© EPLA, 2017
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