Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Surface of a He-3 crystal: Crossover from quantum to classical behavior.
AU - Todoshchenko, Igor A.
AU - Alles, Harry
AU - Junes, Heikki J.
AU - Parshin, Alexander Y.
AU - Tsepelin, Viktor
PY - 2004/10
Y1 - 2004/10
N2 - He-3 crystals start to show facets on their surface only at about 100 mK, well below the roughening transition temperature. To understand the reason for that, we have performed the first quantitative investigation on the growth dynamics of the basic (110) facet at 60-110 mK. The obtained values of the step free energy suggest an extremely weak coupling of the solid-liquid interface to the crystal lattice which we show to be the result of quantum fluctuations of the interface. The renormalization group approach by Nozieres and Gallet, modified to incorporate quantum fluctuations, explains well the temperature dependence of the step energy measured in this work and at ultralow temperatures by Tsepelin et al., where the coupling is known to be strong. We have thus shown that, paradoxically, the role of quantum fluctuations is at higher temperatures much larger than at low temperature.
AB - He-3 crystals start to show facets on their surface only at about 100 mK, well below the roughening transition temperature. To understand the reason for that, we have performed the first quantitative investigation on the growth dynamics of the basic (110) facet at 60-110 mK. The obtained values of the step free energy suggest an extremely weak coupling of the solid-liquid interface to the crystal lattice which we show to be the result of quantum fluctuations of the interface. The renormalization group approach by Nozieres and Gallet, modified to incorporate quantum fluctuations, explains well the temperature dependence of the step energy measured in this work and at ultralow temperatures by Tsepelin et al., where the coupling is known to be strong. We have thus shown that, paradoxically, the role of quantum fluctuations is at higher temperatures much larger than at low temperature.
KW - SOLID HE-3
KW - INTERFACE
KW - GROWTH
KW - LIQUID-HE-3
KW - TRANSITION
KW - MOBILITY
KW - SHAPE
U2 - 10.1103/PhysRevLett.93.175301
DO - 10.1103/PhysRevLett.93.175301
M3 - Journal article
VL - 93
SP - 175301
JO - Physical review letters
JF - Physical review letters
SN - 1079-7114
IS - 17
ER -