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Abstract
In quantum electrodynamics, the zerocharge effect originates from the logarithmic dependence of the coupling constant in the action of the electromagnetic field on the ratio of the ultraviolet and infrared energy cutoffs. An analog of this effect in chiral Weyl superfluid He3A is the logarithmic divergence of the bending energy of the orbital anisotropy axis at low temperatures, where temperature plays the role of the infrared cutoff, and the vector of the orbital anisotropy plays the role of the vector potential of the synthetic electromagnetic field for Weyl fermions. We calculate numerically the spatial distribution of the order parameter in rotating He3A as a function of temperature. At temperatures close to the superfluid transition, we observe formation of vortex skyrmions known as the doublequantum vortex and the vortex sheet. These structures include alternating circular and hyperbolic merons as a bound pair or a chain, respectively. As temperature lowers towards absolute zero, we find a continuous transition in the vortex structures towards a state where the vorticity is distributed in thin tubes around the circular merons. For the vortex sheet, we present a phase diagram of the transition in the temperatureangular velocity plane and calculations of the nuclear magnetic resonance response.
Original language  English 

Article number  104505 
Pages (fromto)  113 
Number of pages  13 
Journal  Physical Review B 
Volume  107 
Issue number  10 
DOIs  
Publication status  Published  Mar 2023 
MoE publication type  A1 Journal articlerefereed 
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Dive into the research topics of 'Transition in vortex skyrmion structures in superfluid He 3 A driven by an analog of the zerocharge effect'. Together they form a unique fingerprint.Projects
 1 Finished

TOPVAC: From Topological Matter to Relativistic Quantum Vacuum
Volovik, G., Nissinen, J., Eltsov, V., Rysti, J., Rantanen, R., Mäkinen, J., Zhang, K., Laurila, S., Volard, M. & Kamppinen, T.
01/10/2016 → 30/09/2022
Project: EU: ERC grants