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Condensed Matter > Quantum Gases
Title: Spin conductivity spectrum and spin superfluidity in a binary Bose mixture
(Submitted on 8 Jan 2023 (v1), last revised 27 Apr 2023 (this version, v2))
Abstract: We investigate the spectrum of spin conductivity for a miscible two-component Bose-Einstein condensate (BEC) that exhibits spin superfluidity. By using the Bogoliubov theory, the regular part being the spin conductivity at finite ac frequency and the spin Drude weight characterizing the delta-function peak at zero frequency are analytically computed. We demonstrate that the spectrum exhibits a power-law behavior at low frequency, reflecting gapless density and spin modes specific to the binary BEC. At the phase transition points into immiscible and quantum-droplet states, the change in quasiparticle dispersion relations modifies the power law. In addition, the spin Drude weight becomes finite, indicating zero spin resistivity due to spin superfluidity. Our results also suggest that the Andreev-Bashkin drag density is accessible by measuring the spin conductivity spectrum.
Submission history
From: Yuta Sekino [view email][v1] Sun, 8 Jan 2023 12:45:15 GMT (843kb,D)
[v2] Thu, 27 Apr 2023 05:44:55 GMT (896kb,D)
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