Acoustic modes of superfluid helium in a cross geometry

POSTER

Abstract

Superfluid helium is a low-loss optomechanical element, and an acoustic quality factor value up to 108 has been realized experimentally in a macroscopic quantum system using a cylindrical microwave cavity [1]. It has been predicted that three orders higher quality factor may be attained with improvements to the experimental system. With these parameters, superfluid helium is a potential candidate for detecting continuous gravitational waves [2]. Here, we study the acoustic modes of superfluid helium inside a cross geometry using a re-entrant microwave cavity that provides improved detection of the acoustic modes. The cross shaped geometry is also predicted to be more sensitive than a cylinder for detection of gravitational waves.

1. L. A. De Lorenzo and K. C. Schwab, New Journal of Physics, 16, 113020 (2014).
2. S. Singh, L. A. De Lorenzo, I. Pikovski, K. C. Schwab, New Journal of Physics, 19, 073023 (2017).

*The University of Alberta; the Natural Sciences and Engineering Research Council, Canada (Grants No. RGPIN-04523-16, No. DAS-492947-16, and No. CREATE-495446-17); the Canada Foundation for Innovation; and National Science Foundation grant PHY-1912480.

Presenters

  • Vaisakh Vadakkumbatt

    • Univ of Alberta

Authors

  • Vaisakh Vadakkumbatt

    • Univ of Alberta

  • Thomas Clark

    • Univ of Alberta

  • Swati Singh

    • University of Delaware
    • Univ of Delaware

  • John Davis

    • Univ of Alberta
    • Physics, University of Alberta