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ARPES Program

The angle-resolved photoemission spectroscopy (ARPES) technique reveals the energy of the charged states of materials and their momentum dependence. ARPES is also highly sensitive to the symmetry of electronic states and their interactions with their environments. ARPES is a premier tool for understanding the emergent properties of superconducting, low-dimensional, or topological materials.

The ALS ARPES Program strives to create instrument environments and workflows that enable the highest-impact discovery-based science, especially in the area of quantum materials. We devise world-leading tools for low-temperature ARPES measurements with world-leading capabilities in energy resolution (down to 1 meV*), spatial resolution (down to 100 nm), spin resolution, operando environments, and in situ synthesis. We strive to support an agile, collaborative environment by working hand-in-hand with our user community to develop experimental protocols, navigate the extensive space of experimental degrees of freedom, and analyze data.

*After Beamline 4.0.3 upgrade in progress.

Beamlines

  • Beamline 4.0.3 — High-Resolution Spectroscopy of Complex Materials (MERLIN)
  • Beamline 7.0.2 — Quantum Materials Growth and Electronic Structure (MAESTRO)
  • Beamline 10.0.1 — Angle- and Spin-Resolved Photoelectron Spectroscopy

Personnel

ALS Staff

Eli Rotenberg

Senior Scientist, Program Lead

Aaron Bostwick

Staff Scientist

Jonathan Denlinger

Staff Scientist

Alexei Fedorov

Staff Scientist

Chris Jozwiak

Staff Scientist

Sung-Kwan Mo

Staff Scientist

Doctoral and Postdoctoral Researchers

  • Cheng Chen, Postdoctoral Researcher, Oxford University and ShanghaiTech University
    ALS Postdoctoral Fellow (2019- )
    Two-dimensional magnetic Van der Waals heterostructures

  • Na Hyun Jo, Quantum Systems Accelerator, Berkeley Lab
    Postdoctoral Researcher (2021- )

  • Yong Zhong, Stanford University
    Postdoctoral Researcher (2019- )
    Magnetic topological insulators and magnetic Weyl semimetals

Program Alumni

  • Chenyi Gu
    ALS Doctoral Fellow (2018-2019), Nanjing University
    Topological crystalline insulating oxide MBE

  • Juan Jiang, Assistant Professor, University of Science and Technology of China
    Postdoctoral Researcher (2015-2017)

  • Yeongkwan Kim, Assistant Professor, KAIST
    Postdoctoral Researcher (2013-2016)

  • Aiji Liang, Research Professor, Shanghai Tech
    Postdoctoral Researcher (2017-2019)

  • Hyejin Ryu, Staff Scientist, Korea Institute of Science and Technology
    Postdoctoral Researcher (2014-2017)

  • Shujie Tang, Staff Scientist, SIMIT
    Postdoctoral Researcher (2015-2019)

  • Caizhi Xu, Applied Scientist, Amazon
    ALS Doctoral Fellow (2016-2017), University of Illinois at Urbana-Champaign

  • Yi Zhang, Professor, Nanjing University
    ALS Postdoctoral Fellow (2011-2015)

  • Bo Zhou, Senior Engineer, Fermi
    Postdoctoral Researcher (2012-2014)