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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Interplay between Pair Density Wave and a Nested Fermi Surface.

Jin-Tao Jin¹, Kun Jiang^2,3, Hong Yao^4,5

¹Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.

Physical Review Letters

|October 28, 2022

Summary

This summary is machine-generated.

Spontaneous time-reversal symmetry breaking emerges from pair density wave ordering and Fermi surface nesting. This explains phenomena in materials like CsV_{3}Sb_{5}, revealing new charge density wave orders.

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

Time-reversal symmetry (TRS) breaking is a key phenomenon in exotic quantum materials.
Pair density wave (PDW) ordering and Fermi surface (FS) nesting are complex electronic states.
The superconductor CsV_{3}Sb_{5} exhibits intriguing properties potentially linked to these states.

Purpose of the Study:

To investigate the mechanism of spontaneous time-reversal symmetry (TRS) breaking.
To explore the interplay between multiple momentum pair density wave (PDW) ordering and Fermi surface (FS) nesting.
To understand the emergence of charge density wave (CDW) orders in relation to PDW states.

Main Methods:

Theoretical modeling of PDW superconductivity on a hexagonal lattice.
Analysis of electronic structure with nested Fermi surfaces at 3/4 electron filling.
Investigation of various spectra: density of states, electron spectral function, and quasiparticle interference.

Main Results:

Demonstrated that PDW ordering and FS nesting naturally lead to spontaneous TRS breaking.
Identified a TRS and inversion broken PDW state with stable Bogoliubov Fermi pockets.
Showed that partial melting of the PDW state results in 2x2, 4x4, and (4/sqrt[3])x(4/sqrt[3]) CDW orders.

Conclusions:

The interplay of multi-momentum PDW and nested FS provides a viable mechanism for TRS breaking.
The theoretical framework explains the coexistence of PDW and CDW orders.
Findings offer insights into the physics of CsV_{3}Sb_{5} and guide future experimental investigations.