Discrete energy levels of Caroli-de Gennes-Matricon states in quantum limit in FeTe0.55Se0.45

@article{Chen2018DiscreteEL,
  title={Discrete energy levels of Caroli-de Gennes-Matricon states in quantum limit in FeTe0.55Se0.45},
  author={Mingyang Chen and Xiaoyu Chen and Huan Yang and Zengyi Du and Xiyu Zhu and Enyu Wang and Hai-Hu Wen},
  journal={Nature Communications},
  year={2018},
  volume={9}
}
Caroli-de Gennes-Matricon (CdGM) states were predicted in 1964 as low-energy excitations within vortex cores of type-II superconductors. In the quantum limit, the energy levels of these states were predicted to be discrete with the basic levels at ±μΔ2/EF (μ = 1/2, 3/2, 5/2, …) with Δ the superconducting energy gap and EF the Fermi energy. However, due to the small ratio of Δ/EF in most type-II superconductors, it is very difficult to observe the discrete CdGM states, but rather a symmetric… Expand
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References

SHOWING 1-10 OF 36 REFERENCES
Observation of Caroli-de Gennes-Matricon Vortex States in YBa_{2}Cu_{3}O_{7-δ}.
TLDR
It is argued that thesuperconductivity of copper oxides is conventional, but the spectroscopic signature does not look so because the superconducting carriers are a minority. Expand
Observation of pristine Majorana bound state in iron-based superconductor
The search for Majorana bound state (MBS) has recently emerged as one of most active research areas in condensed matter physics, due to its non-Abelian statistics which can be used for robust quantumExpand
Effect of a point impurity on the vortex bound states in an s-wave superconductor: A self-consistent analysis
On the basis of self-consistent numerical solution of the Bogoliubov‐de Gennes equations on a finite-size lattice, we study the variation of the vortex bound state when an impurity potential is addedExpand
Tuning across the BCS-BEC crossover in the multiband superconductor Fe1+ySexTe1−x: An angle-resolved photoemission study
TLDR
This work realizes the BCS-BEC crossover in a nearly compensated semimetal, Fe1+ySexTe1−x, by tuning the Fermi energy εF via chemical doping, which permits us to systematically change Δ/εF from 0.16 to 0.50. Expand
Unconventional s-Wave Superconductivity in Fe(Se,Te)
Breaking Convention The defining characteristics of a superconductor are symmetry of gap function, which tells us something about how pairs of electrons move through the sample, and the strength ofExpand
Core structure and low-energy spectrum of isolated vortex lines in clean superconductors atT ≪Tc
We present analytic solutions of the Eilenberger equations for the low-frequency Green's functions corresponding to those quasiparticles whose trajectories pass near the center of an isolated vortex.Expand
Self-consistent electronic structure of a vortex line in a type-II superconductor.
  • Gygi, Schlüter
  • Physics, Medicine
  • Physical review. B, Condensed matter
  • 1991
TLDR
The electronic structure of a vortex line in a type-II superconductor is calculated self-consistently in the framework of the Bogoliubov--de Gennes theory, and the resulting local density of states has a characteristic star shape in real space, whose orientation is energy dependent, in agreement with recent STM experiments. Expand
Low-Lying Quasiparticle Excitations around a Vortex Core in Quantum Limit
Focusing on a quantum-limit behavior, we study a single vortex in a clean s-wave type-II superconductor by self-consistently solving the Bogoliubov-de Gennes equation. The discrete energy levels ofExpand
Density of states in the vortex state of type-II superconductors.
  • Klein
  • Physics, Medicine
  • Physical review. B, Condensed matter
  • 1989
TLDR
The energy dependence of the local density of states near the vortex axis is found to be in qualitative agreement with recent scanning-tunneling-microscope measurements. Expand
A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2
TLDR
Low-temperature electronic structure imaging studies of a lightly hole-doped copper oxide are presented, consistent with an unanticipated crystalline electronic state, possibly the hidden electronic order, existing in the zero-tem temperature pseudogap regime of Ca2-xNaxCuO2Cl2. Expand
...
1
2
3
4
...