Superconducting Gap Modulation in Weak Stripe States
Masanori Ichioka, Kazushige Machida (Okayama Univ.)
TL;DR
This paper explores how weak stripe structures influence the superconducting gap in cuprates, using theoretical modeling to connect with experimental scanning tunneling spectroscopy observations.
Contribution
It introduces a theoretical analysis of superconducting gap modulation caused by weak stripe states within the Hubbard model framework.
Findings
Superconducting gap exhibits modulation consistent with stripe periodicity.
Band folding effects influence the Fermi surface and gap structure.
Results align with recent experimental spectroscopic data.
Abstract
The superconducting gap modulation is investigated in the presence of a weak stripe structure, using the Bogoliubov-de Gennes theory on the two-dimensional Hubbard model with nearest-neighbor site pairing interaction. We calculate the local density of states and discuss the recently observed scanning tunneling spectroscopy spectra with four lattice periodicity on Bi_2 Sr_2 Ca Cu_2 O_{8+delta} We also consider the spectral weight in the reciprocal space, where the Fermi surface and the superconducting gap are modulated by the band folding effect of the stripe structure.
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