# 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

#### 51 Citations

Observation of Discrete Conventional Caroli-de Gennes-Matricon States in the Vortex Core of Single-Layer FeSe/SrTiO_{3}.

- Medicine, Physics
- Physical review letters
- 2020

Results indicate an s-wave pairing without sign change in the high-T_{C} FeSe/SrTiO_{3} superconductor. Expand

Robust and Clean Majorana Zero Mode in the Vortex Core of High-Temperature Superconductor
(Li0.84Fe0.16)OHFeSe

- Physics
- Physical Review X
- 2018

The Majorana fermion, which is its own anti-particle and obeys non-abelian statistics, plays a critical role in topological quantum computing. It can be realized as a bound state at zero energy,… Expand

Half-integer level shift of vortex bound states in an iron-based superconductor

- Physics
- Nature Physics
- 2019

Vortices in topological superconductors may host Majorana zero modes (MZMs), which have been proposed as the building blocks of fault-tolerant topological quantum computers. Recently, a new… Expand

Large spectral gap and impurity-induced states in a two-dimensional Abrikosov vortex

- Physics
- Physical Review B
- 2021

We study the subgap spectrum of a 2D Abrikosov vortex in an $s$-wave superconductor in the absence and presence of a point impurity. By solving the Eilenberger equations without impurity for two… Expand

Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)

- Physics, Materials Science
- Nature Materials
- 2019

High-resolution spectroscopy supports the presence of Majorana bound states in an iron-based topological superconductor and elucidate the necessary conditions to realize the ZVBS, which paves the way towards controllable Majorana quasiparticles. Expand

Vortex states in the Ising superconductors on honeycomb lattice

- Physics
- Physica C: Superconductivity and its Applications
- 2021

Abstract By self-consistently solving the Bogoliubov-de Gennes equations of a model Hamiltonian built on the honeycomb lattice, we study the roles played by the Ising spin-orbital coupling (ISOC)… Expand

Direct visualization of sign-reversal
s±
superconducting gaps in
FeTe0.55Se0.45

- Physics
- Physical Review B
- 2019

In many unconventional superconductors, the pairing of electrons is driven by the repulsive interaction, which leads to the sign reversal of superconducting gaps along the Fermi surfaces (FS) or… Expand

Electronic properties of the bulk and surface states of Fe1+yTe1−xSex

- Medicine
- Nature Materials
- 2021

This work combines neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe1+yTe1−xSex, and establishes a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, whereas the coexisting topological surface state occurs only in association with distinct antiferromagnetic correlations. Expand

Recent progress of scanning tunneling microscopy/spectroscopy study of Majorana bound states in the FeTe0.55Se0.45 superconductor

- Physics
- 2021

Majorana bound states (MBSs) are spatially-localized zero-energy quasiparticles following non-Abelian braiding statistics that hold a great promise for fault-tolerant topological quantum computing.… Expand

Majorana bound states on a periodic superconducting vortex lattice

- Physics
- 2020

Majorana quasi-particles can exist as zero-energy excitations bound to vortices present on the surface of a topological insulator that is proximity-coupled to a type-II superconductor. Such a system… Expand

#### References

SHOWING 1-10 OF 36 REFERENCES

Observation of Caroli-de Gennes-Matricon Vortex States in YBa_{2}Cu_{3}O_{7-δ}.

- Physics, Medicine
- Physical review letters
- 2017

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

- Physics
- 2017

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 quantum… Expand

Effect of a point impurity on the vortex bound states in an s-wave superconductor: A self-consistent analysis

- Physics
- 2000

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 added… Expand

Tuning across the BCS-BEC crossover in the multiband superconductor Fe1+ySexTe1−x: An angle-resolved photoemission study

- Physics, Medicine
- Science Advances
- 2017

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)

- Physics, Medicine
- Science
- 2010

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 of… Expand

Core structure and low-energy spectrum of isolated vortex lines in clean superconductors atT ≪Tc

- Physics
- 1974

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.

- Physics, Medicine
- Physical review. B, Condensed matter
- 1991

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

- Physics
- 1998

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 of… Expand

Density of states in the vortex state of type-II superconductors.

- Physics, Medicine
- Physical review. B, Condensed matter
- 1989

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

- Chemistry, Physics
- Nature
- 2004

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