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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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An integrated quantum material testbed with multi-resolution photoemission spectroscopy.

Chenhui Yan1, Emanuel Green1, Riku Fukumori1

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA.

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|December 2, 2021
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Summary

A new multi-resolution photoemission spectroscopy (MRPES) setup offers unprecedented simultaneous measurements in energy, momentum, space, and time for quantum materials. This breakthrough enables advanced characterization of novel quantum devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Quantum materials require advanced characterization techniques to understand their complex properties.
  • Traditional photoemission spectroscopy methods often lack the necessary resolution in multiple dimensions (energy, momentum, space, time).

Purpose of the Study:

  • To develop and present a novel multi-resolution photoemission spectroscopy (MRPES) setup.
  • To integrate multiple photoemission techniques into a single, versatile instrument.
  • To achieve high-resolution measurements across energy, momentum, space, and time.

Main Methods:

  • Integration of three light sources into a single photoemission setup.
  • Capability to switch between angle-resolved photoemission spectroscopy (ARPES), time-resolved ARPES (trARPES), and spatially resolved ARPES.
  • Utilization of solid-state nonlinear crystals for frequency upconversion in trARPES.
  • Integration with a shadow-mask assisted molecular beam epitaxy system.

Main Results:

  • Achieved energy resolution of <4 meV, time resolution of <35 fs, and spatial resolution of ~10 μm.
  • Obtained the shortest time resolution among current trARPES setups.
  • Demonstrated the setup's functionality as a quantum device characterization instrument.

Conclusions:

  • The developed MRPES setup provides a first-time all-in-one solution for comprehensive quantum material analysis.
  • This novel testbed facilitates advanced characterization of quantum materials and devices.
  • The integration with MBE enables in-situ characterization of fabricated quantum structures.