Small Fermi pockets intertwined with charge stripes and pair density wave order in a kagome superconductor

Abstract

The kagome superconductor family AV3Sb5 (A=Cs, K, Rb) emerged as an exciting platform to study exotic Fermi surface instabilities. Here we use spectroscopic-imaging scanning tunneling microscopy (SI-STM) and angle-resolved photoemission spectroscopy (ARPES) to reveal how the surprising cascade of higher and lower-dimensional density waves in CsV3Sb5 is intimately tied to a set of small reconstructed Fermi pockets. ARPES measurements visualize the formation of these pockets generated by a 3D charge density wave transition. The pockets are connected by dispersive q* wave vectors observed in Fourier transforms of STM differential conductance maps. As the additional 1D charge order emerges at a lower temperature, q* wave vectors become substantially renormalized, signaling further reconstruction of the Fermi pockets. Remarkably, in the superconducting state, the superconducting gap modulations give rise to an in-plane Cooper pair-density-wave at the same q* wave vectors. Our work demonstrates the intrinsic origin of the charge-stripes and the pair-density-wave in CsV3Sb5 and their relationship to the Fermi pockets. These experiments uncover a unique scenario of how Fermi pockets generated by a parent charge density wave state can provide a favorable platform for the emergence of additional density waves.

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Cited by in corpus (15)

• The kagome Hubbard model from a functional renormalization group perspective
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• Self-consistent theory of $2\times 2$ pair density waves in kagome superconductors
• Search for orbital magnetism in the kagome superconductor $\mathrm{Cs}{\mathrm{V}}_3\mathrm{S}{\mathrm{b}}_5$ using neutron diffraction
• Revealing the orbital origins of exotic electronic states with Ti substitution in kagome superconductor CsV3Sb5
• Cooper quartets in interacting hybrid superconducting systems
• Pair-breaking scattering interference as a mechanism for superconducting gap modulation
• Darkness in interlayer and charge density wave states of 2H-TaS2
• Quantifying magnetic field driven lattice distortions in kagome metals at the femto-scale using scanning tunneling microscopy
• Theories for charge-driven nematicity in kagome metals
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5
• Pairing correlation of the Kagome-lattice Hubbard model with the nearest-neighbor interaction
• Nanoscale strain manipulation of smectic susceptibility in kagome superconductors
• Nonequilibrium control of kagome metals