| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Quantum Hydrodynamics of Fractonic Superfluids with Lineon Condensate: From Navier–Stokes-Like Equations to Landau-Like Criterion |
| Jian-Keng Yuan1, Shuai A. Chen2*, and Peng Ye1* |
1School of Physics, State Key Laboratory of Optoelectronic Materials and Technologies, and Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-sen University, Guangzhou 510275, China
2Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
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| Cite this article: |
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Jian-Keng Yuan, Shuai A. Chen, and Peng Ye 2022 Chin. Phys. Lett. 39 057101 |
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Abstract Fractonic superfluids are exotic states of matter with spontaneously broken higher-rank $U(1)$ symmetry. The broken symmetry is associated with conserved quantities, including not only particle number (i.e., charge) but also higher moments, such as dipoles, quadrupoles, and angular moments. Owing to the presence of such conserved quantities, the mobility of particles is restricted either completely or partially. Here, we systematically study the hydrodynamical properties of fractonic superfluids, especially focusing on the fractonic superfluids with conserved angular moments. The constituent bosons are called “lineons” with $d$ components in $d$-dimensional space. From the Euler–Lagrange equation, we derive the continuity equation and Navier–Stokes-like equations, in which the angular moment conservation introduces extra terms. Further, we discuss the current configurations related to the defects. Like the conventional superfluid, we study the critical values of velocity fields and density currents, which gives rise to a Landau-like criterion. Finally, several future directions are discussed.
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Received: 04 March 2022
Editors' Suggestion
Published: 26 April 2022
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| PACS: |
71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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47.37.+q
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(Hydrodynamic aspects of superfluidity; quantum fluids)
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11.30.-j
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(Symmetry and conservation laws)
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