Exotic superconductivity is formed by unconventional electron pairing and exhibits various unique properties that cannot be explained by the basic theory. The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is known as an exotic superconducting state in that the electron pairs have a finite center-of-mass momentum leading to a spatially modulated pattern of superconductivity. The spatial modulation endows the FFLO state with emergent anisotropy. However, the anisotropy has never been experimentally verified despite numerous efforts over the years. Here, we report detection of anisotropic acoustic responses depending on the sound propagation direction appearing above the Pauli limit. This anisotropy reveals that the two-dimensional FFLO state has a center-of-mass momentum parallel to the nesting vector on the Fermi surface. The present findings will facilitate our understanding of not only superconductivity in solids but also exotic pairings of various particles.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9530125 | PMC |
| http://dx.doi.org/10.1038/s41467-022-33354-1 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Constructing the Fulde-Ferrell-Larkin-Ovchinnikov State in a CrOCl/NbSe van der Waals Heterostructure.
Nano Lett
October 2024
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Article Synopsis
- Time reversal symmetry breaking in superconductors leads to unique properties, specifically through the FFLO state influenced by external magnetic fields.
- The study demonstrates the construction of the FFLO state in a CrOCl/NbSe vdW heterostructure, showing a weak superconducting gap and upper critical field consistent with FFLO behavior.
- First-principles calculations highlight the role of Cr vacancies in CrOCl and suggest potential for discovering similar FFLO states in other two-dimensional materials.
Magnetotransport and Fermi surface segmentation in Pauli limited superconductors.
J Phys Condens Matter
January 2024
Department of Physics and Nanotechnology, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, India.
We report the first theoretical investigation of the spectroscopic, electrical and optical transport signatures of-wave Pauli limited superconductors, based on a non perturbative numerical approach. We demonstrate that the high magnetic field low temperature regime of these materials host a finite momentum paired superconducting phase. Multi-branched dispersion spectra with finite energy superconducting gaps, anisotropic segmentation of the Fermi surface and spatial modulations of the superconducting order characterizes this finite momentum paired phase and should be readily accessible through angle resolved photo emission spectroscopy, quasiparticle interference and differential conductance measurements.
View Article and Find Full Text PDFGeneration and decay of Higgs mode in a strongly interacting Fermi gas.
Sci Rep
July 2023
Faculty of Physics, Warsaw University of Technology, Ulica Koszykowa 75, 00-662, Warsaw, Poland.
We investigate the life cycle of the large amplitude Higgs mode in strongly interacting superfluid Fermi gas. Through numerical simulations with time-dependent density functional theory and the technique of the interaction quench, we verify the previous theoretical predictions on the mode's frequency. Next, we demonstrate that the mode is dynamically unstable against external perturbation and qualitatively examine the emerging state after the mode decays.
View Article and Find Full Text PDFOrbital Fulde-Ferrell-Larkin-Ovchinnikov state in an Ising superconductor.
Nature
July 2023
Device Physics of Complex Materials, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
Article Synopsis
- Superconductors can exhibit a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state due to the Zeeman effect from an external magnetic field, which affects Cooper pairings when symmetries like time-reversal are broken.
- In materials lacking local inversion symmetry, the interplay of the Zeeman effect with spin-orbit coupling (SOC), especially Rashba SOC, allows for the emergence of more accessible Rashba FFLO states across a larger area of the phase diagram.
- The discovery of an unconventional orbital FFLO state in the multilayer Ising superconductor 2H-NbSe offers a new understanding of finite-momentum superconductivity, featuring a defined phase diagram that identifies multiple
Direct observation of a superconducting vortex diode.
Nat Commun
March 2023
The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel.
The interplay between magnetism and superconductivity can lead to unconventional proximity and Josephson effects. A related phenomenon that has recently attracted considerable attention is the superconducting diode effect, in which a nonreciprocal critical current emerges. Although superconducting diodes based on superconductor/ferromagnet (S/F) bilayers were demonstrated more than a decade ago, the precise underlying mechanism remains unclear.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!