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Title: Torque and Angular-Momentum Transfer in Merging Rotating Bose-Einstein Condensates

Abstract

When rotating classical fluid drops merge together, angular momentum can be advected from one to another due to the viscous shear flow at the drop interface. It remains elusive what the corresponding mechanism is in inviscid quantum fluids such as Bose-Einstein condensates (BECs). In this work, we report our theoretical study of an initially static BEC merging with a rotating BECin three-dimensional space along the rotational axis. We show that a solitonlike sheet, resembling a corkscrew, spontaneously emerges at the interface. Furthermore, rapid angular momentum transfer at a constant rate universally proportional to the initial angular-momentum density is observed. Strikingly, this transfer does not necessarily involve fluid advection or drifting of the quantized vortices. We reveal that the corkscrew structure can exert a torque that directly creates angular momentum in the static BEC and annihilates angular momentum in the rotating BEC. Uncovering this intriguing angular momentum transport mechanism may benefit our understanding of various coherent matter-wave systems, spanning from atomtronics on chips to dark matter BECs at cosmic scales.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3]
  1. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida State Univ., Tallahassee, FL (United States)
  2. Osaka City Univ. (Japan); The OCU Advanced Research Inst. for Natural Science and Technology (OCARINA), Osaka (Japan); Nambu Yoichiro Inst. of Theoretical and Experimental Physics (NITEP), Osaka (Japan)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Office of Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS); USDOE
OSTI Identifier:
1619302
Alternate Identifier(s):
OSTI ID: 1603838
Grant/Contract Number:  
AC02-06CH11357; DMR-1807291; DMR-1644779; JP17K05548
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 124; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Quantum fluids & solids; quantum transport; superfluidity; Bose-Einstein condensates; liquid-liquid interfaces; solitons

Citation Formats

Kanai, Toshiaki, Guo, Wei, Tsubota, Makoto, and Jin, Dafei. Torque and Angular-Momentum Transfer in Merging Rotating Bose-Einstein Condensates. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevlett.124.105302.
Kanai, Toshiaki, Guo, Wei, Tsubota, Makoto, & Jin, Dafei. Torque and Angular-Momentum Transfer in Merging Rotating Bose-Einstein Condensates. United States. https://doi.org/10.1103/physrevlett.124.105302
Kanai, Toshiaki, Guo, Wei, Tsubota, Makoto, and Jin, Dafei. Tue . "Torque and Angular-Momentum Transfer in Merging Rotating Bose-Einstein Condensates". United States. https://doi.org/10.1103/physrevlett.124.105302. https://www.osti.gov/servlets/purl/1619302.
@article{osti_1619302,
title = {Torque and Angular-Momentum Transfer in Merging Rotating Bose-Einstein Condensates},
author = {Kanai, Toshiaki and Guo, Wei and Tsubota, Makoto and Jin, Dafei},
abstractNote = {When rotating classical fluid drops merge together, angular momentum can be advected from one to another due to the viscous shear flow at the drop interface. It remains elusive what the corresponding mechanism is in inviscid quantum fluids such as Bose-Einstein condensates (BECs). In this work, we report our theoretical study of an initially static BEC merging with a rotating BECin three-dimensional space along the rotational axis. We show that a solitonlike sheet, resembling a corkscrew, spontaneously emerges at the interface. Furthermore, rapid angular momentum transfer at a constant rate universally proportional to the initial angular-momentum density is observed. Strikingly, this transfer does not necessarily involve fluid advection or drifting of the quantized vortices. We reveal that the corkscrew structure can exert a torque that directly creates angular momentum in the static BEC and annihilates angular momentum in the rotating BEC. Uncovering this intriguing angular momentum transport mechanism may benefit our understanding of various coherent matter-wave systems, spanning from atomtronics on chips to dark matter BECs at cosmic scales.},
doi = {10.1103/physrevlett.124.105302},
journal = {Physical Review Letters},
number = 10,
volume = 124,
place = {United States},
year = {2020},
month = {3}
}

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