Optical and magnetic penetration depths under a modified electromagnetic coupling in charged bosonic condensates
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 q2ns/m∗, the modified coupling doubles the inverse-square magnetic screening length and the optical condensate weight, giving λmag=λstiff=λL/√2, where λL−2=μ0q2ns/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, MgB2, and Ba(Fe,Co)2As2 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
@misc{minotti2026optical,
title = {{Optical and magnetic penetration depths under a modified electromagnetic coupling in charged bosonic condensates}},
author = {F. Minotti and G. Modanese},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.20499},
eprint = {2605.20499},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.20499},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Optical and magnetic penetration depths under a modified electromagnetic coupling in charged bosonic condensates
AU - F. Minotti
AU - G. Modanese
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2605.20499
UR - https://arxiv.org/abs/2605.20499
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^2n_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_0q^2n_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)_2As_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.
ER -