Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability

Abstract

The paper describes a time- and angle-resolved photoemission apparatus consisting of a hemispherical analyzer and a pulsed laser source. We demonstrate 1.48-eV pump and 5.90-eV probe measurements at the >10.5-meV and >240-fs resolutions by use of fairly monochromatic 170-fs pulses delivered from a regeneratively amplified Ti:sapphire laser system operating typically at 250 kHz. The apparatus is capable to resolve the optically filled superconducting peak in the unoccupied states of a cuprate superconductor, Bi2Sr2CaCu2O8+d. A dataset recorded on Bi(111) surface is also presented. Technical descriptions include the followings: A simple procedure to fine-tune the spatio-temporal overlap of the pump-and-probe beams and their diameters; achieving a long-term stability of the system that enables a normalization-free dataset acquisition; changing the repetition rate by utilizing acoustic optical modulator and frequency-division circuit.

References in corpus (18)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Observation of Floquet-Bloch states on the surface of a topological insulator
• Destruction of the Fermi Surface in Underdoped High Tc Superconductors
• Strong spin-orbit splitting on Bi surfaces
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
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• Particle-Hole Symmetry Breaking in the Pseudogap State of Bi2201
• Ultrafast melting of a charge-density wave in the Mott insulator 1T-TaS2
• Nodal quasiparticle meltdown in ultra-high resolution pump-probe angle-resolved photoemission
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• The Origin and Non-quasiparticle Nature of Fermi Arcs in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Non-thermal hot electrons ultrafastly generating hot optical phonons in graphite
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• Femtosecond core level photoemision spectroscopy on 1T-TaS2 using 60 eV laser source
• Ultrafast quenching of electron-boson interaction and superconducting gap in a cuprate superconductor
• Pre-pairing and the "Filling" Gap in the Cuprates From the Tomographic Density of States
• Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy

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• New Developments in Laser-Based Photoemission Spectroscopy and its Scientific Applications: a Key Issues Review
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• Functions to map photoelectron distributions in a variety of setups in angle-resolved photoemission spectroscopy
• High repetition pump-and-probe photoemission spectroscopy based on a compact fiber laser system
• Electronic structure and relaxation dynamics in a superconducting topological material
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• An Integrated Quantum Material Testbed with Multi-Resolution Photoemission Spectroscopy
• Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser
• Angle-resolved photoemission spectroscopy with an $\text{in situ}$ tunable magnetic field
• Interplay of superconductivity and bosonic coupling in the peak-dip-hump structure of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Switching on surface conduction in a topological insulator
• Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy