Muonium hydride: The lowest density crystal

Kora, Youssef; Boninsegni, Massimo; Son, Dam Thanh; Zhang, Shiwei

doi:10.1103/physrevresearch.3.023113

Title: Muonium hydride: The lowest density crystal

Journal Article · Mon May 10 00:00:00 EDT 2021 · Physical Review Research

DOI:https://doi.org/10.1103/physrevresearch.3.023113· OSTI ID:1821662

Kora, Youssef ^[1];

^[1]; Son, Dam Thanh ^[2]; Zhang, Shiwei ^[3]

Univ. of Alberta, Edmonton, AB (Canada)
Univ. of Chicago, IL (United States)
Flatiron Institute, New York, NY (United States); College of William and Mary, Williamsburg, VA (United States)

A muonium hydride molecule is a bound state of muonium and hydrogen atoms. It has half the mass of a parahydrogen molecule and very similar electronic properties in its ground state. The phase diagram of an assembly of such particles is investigated by first-principles quantum simulations. In the bulk limit, the low-temperature equilibrium phase is a crystal of extraordinarily low density, lower than that of any other known atomic or molecular crystal. Despite the low density and particle mass, the melting temperature is surprisingly high (close to 9 K). No (metastable) supersolid phase is observed. We investigated the physical properties of nanoscale clusters (up to 200 particles) of muonium hydride and found the superfluid response to be greatly enhanced compared to that of parahydrogen clusters. The possible experimental realization of these systems is discussed.

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Research Organization:: Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); Natural Sciences and Engineering Research Council of Canada (NSERC); Simons Foundation

Grant/Contract Number:: SC0009924

OSTI ID:: 1821662

Journal Information:: Physical Review Research, Vol. 3, Issue 2; ISSN 2643-1564

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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