Spatially Modulated Superfluid State in Two-Dimensional He4 Films

Autor:	Alexey A. Zadorozhko, Jaewon Choi, JeaKyung Choi, Eunseong Kim
Rok vydání:	2021
Předmět:	Condensed Matter::Quantum Gases Superfluidity Physics Work (thermodynamics) Supersolid Superfluid state Condensed matter physics Condensed Matter::Other Phase (matter) General Physics and Astronomy Layer (electronics) Quantum Phase diagram
Zdroj:	Physical Review Letters. 127
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.127.135301
Popis:	The second layer of ^{4}He films adsorbed on a graphite substrate is an excellent experimental platform to study the interplay between superfluid and structural orders. Here, we report a rigid two-frequency torsional oscillator study on the second layer as a function of temperature and ^{4}He atomic density. For the first time, we show experimentally that the superfluid density is independent of frequency, which can be interpreted as unequivocal evidence of genuine superfluidity. The phase diagram established in this work reveals that a superfluid phase coexists with hexatic density-wave correlation and a registered solid phase. This suggests the second layer as a candidate for hosting two exotic quantum ground states: the spatially modulated superfluid and supersolid phases resulting from the interplay between superfluid and structural orders.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b718ebaf96ef7614b51a09ce216bc277 https://doi.org/10.1103/physrevlett.127.135301 Zobrazit plný text záznamu