Optical and magnetic penetration depths under a modified electromagnetic coupling in charged bosonic condensates
- 1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Física Interdisciplinaria y Aplicada (INFINA), Buenos Aires, Argentina
- 2Free University of Bozen-Bolzano, Faculty of Engineering, I-39100 Bolzano, Italy; Corresponding author.
Abstract
We establish the relation between optical condensate spectral weight and static magnetic screening in a proposed effective theory of charged bosonic condensates with an additional diamagnetic coupling. Starting from an explicit Ginzburg–Landau functional, we derive both the London equation and the transverse low-frequency conductivity. At fixed condensate parameter q 2 n s / m ∗ , the modified coupling doubles the inverse-square magnetic screening length and the optical condensate weight, giving λ mag = λ stiff = λ L / 2 , where λ L − 2 = μ 0 q 2 n s / m ∗ . Their ratio is therefore unity in both the standard and modified local theories: it tests consistency between measurement methods but cannot distinguish the couplings. A structured comparison of published results for Nb, Pb, YBCO, MgB 2 , and Ba(Fe,Co) 2 As 2 identifies the roles of sample matching, absolute calibration, nonlocality, and spectral-weight extraction. We formulate the requirements for a discriminating absolute-response experiment and discuss a complementary single-particle spectral prediction. The analysis separates experimentally accessible consistency checks from tests requiring independent information about condensate parameters or a different observable.
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BibTeX
@article{minotti2026optical,
title = {{Optical and magnetic penetration depths under a modified electromagnetic coupling in charged bosonic condensates}},
author = {F. Minotti and G. Modanese},
journal = {Physics Open},
year = {2026},
month = oct,
doi = {10.1016/j.physo.2026.100500},
url = {https://doi.org/10.1016/j.physo.2026.100500},
note = {CC BY},
}
RIS
TY - JOUR
TI - Optical and magnetic penetration depths under a modified electromagnetic coupling in charged bosonic condensates
AU - F. Minotti
AU - G. Modanese
PY - 2026
DA - 2026/10/30
JO - Physics Open
DO - 10.1016/j.physo.2026.100500
UR - https://doi.org/10.1016/j.physo.2026.100500
AB - We establish the relation between optical condensate spectral weight and static magnetic screening in a proposed effective theory of charged bosonic condensates with an additional diamagnetic coupling. Starting from an explicit Ginzburg–Landau functional, we derive both the London equation and the transverse low-frequency conductivity. At fixed condensate parameter q 2 n s / m ∗ , the modified coupling doubles the inverse-square magnetic screening length and the optical condensate weight, giving λ mag = λ stiff = λ L / 2 , where λ L − 2 = μ 0 q 2 n s / m ∗ . Their ratio is therefore unity in both the standard and modified local theories: it tests consistency between measurement methods but cannot distinguish the couplings. A structured comparison of published results for Nb, Pb, YBCO, MgB 2 , and Ba(Fe,Co) 2 As 2 identifies the roles of sample matching, absolute calibration, nonlocality, and spectral-weight extraction. We formulate the requirements for a discriminating absolute-response experiment and discuss a complementary single-particle spectral prediction. The analysis separates experimentally accessible consistency checks from tests requiring independent information about condensate parameters or a different observable.
SN - 2666-0326
ER -