Elementary Steps on the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>H</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>4</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mi>e</mi></math></span> Crystal Interface Probed by <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>H</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>3</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mi>e</mi></math></span> Atoms

V. Tsepelin; J. P. Saramäki; A. V. Babkin; P. J. Hakonen; J. J. Hyvönen; R. M. Luusalo; A. Ya. Parshin; G. K. Tvalashvili

doi:10.1103/PhysRevLett.83.4804

Elementary Steps on the ${}^{4}H e$ Crystal Interface Probed by ${}^{3}H e$ Atoms

V. Tsepelin, J. P. Saramäki, A. V. Babkin, P. J. Hakonen, J. J. Hyvönen, R. M. Luusalo, A. Ya. Parshin, and G. K. Tvalashvili

Phys. Rev. Lett. 83, 4804 – Published 6 December 1999

Abstract

The growth dynamics of $c$ facets, governed by individual Frank-Read type of sources, has been studied at millikelvin temperatures in the presence of small concentrations of $^{3} He$ atoms in the liquid. We find that in the spiral growth regime, interaction of $^{3} He$ atoms with moving elementary steps on the surface results in additional friction. Our results are compared with theory, where high-frequency ( $ω \geq T / ħ$ ) zero-point oscillations of the steps are taken into account. There is a good agreement if we assume the amplitude of these oscillations $ξ \approx 5 nm$ .

Received 13 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4804

Authors & Affiliations

V. Tsepelin, J. P. Saramäki, A. V. Babkin^*, P. J. Hakonen, J. J. Hyvönen, R. M. Luusalo, A. Ya. Parshin^†, and G. K. Tvalashvili^‡

Low Temperature Laboratory, Helsinki University of Technology, 02150 Espoo, Finland

^*Corresponding author. Present address: Department of Physics and Astronomy, University of New Mexico, 800 Yale Blvd., Albuquerque, NM 87131.
^†Permanent address: P. L. Kapitza Institute for Physical Problems, ul. Kosygina 2, 117334, Moscow, Russia.
^‡Present address: Department of Physics, Lancaster University, Lancaster LA1 4YB, UK.