|
| | | | |
| | | |
| Stat |
Members: 3669
Articles: 2'599'751
Articles rated: 2609
22 March 2025 |
|
| | | | |
|
Article overview
| |
|
|
Correlation-induced Fermi surface evolution and topological crystalline superconductivity in CeRh2As2 | | Jun Ishizuka
; Kosuke Nogaki
; Manfred Sigrist
; Youichi Yanase
; | | Date: |
1 Nov 2023 | | Abstract: | Locally noncentrosymmetric structures in crystals are attracting much
attention owing to emergent phenomena associated with the sublattice degree of
freedom. The newly discovered heavy fermion superconductor CeRh$_2$As$_2$ is
considered to be an excellent realization of this class. Angle-resolved
photoemission spectroscopy experiments recently observed low-energy spectra of
electron and hole bands and characteristic Van Hove singularities, stimulating
us to explore the electronic correlation effect on the band structure. In this
Letter, we theoretically study the electronic state and topological
superconductivity from first principles. Owing to the Coulomb repulsion $U$ of
Ce 4$f$ electrons, the low-energy band structure is modified in accordance with
the experimental result. We show that Fermi surfaces change significantly from
a complicated three-dimensional structure to a simple two-dimensional one.
Fermi surface formulas for one-dimensional $mathbb{Z}_2$ invariants in class D
indicate topological crystalline superconductivity protected by the glide
symmetry in a broad region for $U$. The classification of superconducting gap
structure reveals topologically protected excitation gap and node. Our findings
of the correlation-induced evolution of electronic structure provide a basis to
clarify the unusual phase diagram of CeRh$_2$As$_2$ including
superconductivity, magnetic order, and quadrupole density wave, and accelerate
the search for topological superconductivity in strongly correlated electron
systems. | | Source: | arXiv, 2311.00324 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
|
| |
|
|
|
REGISTER