Holographic superfluid with gauge-axion coupling
| Autor: | Liu, Yan, Wang, Xi-Jing, Wu, Jian-Pin, Zhang, Xin |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Eur.Phys.J.C 83 (2023) 8, 748 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epjc/s10052-023-11918-9 |
| Popis: | We have constructed a holographic superfluid with gauge-axion coupling. Depending on whether the coupling is positive or negative, the system displays metallic or insulating behavior in its normal state. A significant feature of the system is the appearance of a mid-IR peak in the alternating current (AC) conductivity in a certain range of parameters. This peak arises due to competition between explicit symmetry breaking (ESB) and spontaneous symmetry breaking (SSB), which results in the presence of a pseudo-Goldstone mode. Moreover, a dip in low-frequency AC conductivity is observed, stemming from the excitation of the SSB Goldstone mode. In the superfluid phase, the effect of gauge-axion coupling on the condensation or superfluid energy gap is only amplified in the presence of strong momentum dissipation. Notably, for the case with negative gauge-axion coupling, a hard-gap-like behavior at low frequency and a pronounced peak at intermediate frequency are observed, indicating that the evolution of the superfluid component is distinct from that of positive coupling. Comment: 23 pages,7 figures. Published version |
| Databáze: | arXiv |
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