An Integrated Quantum Material Testbed with Multi-Resolution Photoemission Spectroscopy

Abstract

We present the development of a multi-resolution photoemission spectroscopy (MRPES) setup which probes quantum materials in energy, momentum, space, and time. This versatile setup integrates three light sources in one photoemission setup, and can conveniently switch between traditional angle-resolved photoemission spectroscopy (ARPES), time-resolved ARPES (trARPES), and micron-scale spatially resolved ARPES ($\mu$ARPES). It provides a first-time all-in-one solution to achieve an energy resolution $<4$ meV, a time resolution $<35$ fs, and a spatial resolution $\sim 10$ $\mu$m in photoemission spectroscopy. Remarkably, we obtain the shortest time resolution among the trARPES setups using solid-state nonlinear crystals for frequency upconversion. Furthermore, this MRPES setup is integrated with a shadow-mask assisted molecular beam epitaxy system, which transforms the traditional photoemission spectroscopy into a quantum device characterization instrument. We demonstrate the functionalities of this novel quantum material testbed using FeSe/SrTiO${}_3$ thin films and MnBi${}_4$Te${}_7$ magnetic topological insulators.

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Cited by in corpus (9)

• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states
• Layer-by-layer disentanglement of Bloch states via frequency-domain photoemission
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Development of a Laser-based angle-resolved-photoemission spectrometer with sub-micrometer spatial resolution and high-efficiency spin detection
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• Preservation of Topological Surface States in Millimeter-Scale Transferred Membranes
• Spectroscopic evidence of intra-unit-cell charge redistribution in charge-neutral magnetic topological insulator Sb-doped MnBi6Te10