Mark D Lumsden

Mark D Lumsden serves as Spectroscopy Section Head within the Neutron Scattering Division of Oak Ridge National Laboratory's Neutron Sciences Directorate, overseeing operations of 10 neutron spectrometers across the High Flux Isotope Reactor (HFIR) and Spallation Neutron Source (SNS) facilities. A McMaster University PhD graduate (1999), he joined ORNL as a Eugene P. Wigner Fellow before progressing through leadership roles including Time-of-Flight Spectroscopy Group Leader (2011-2017) and Spectroscopy Group Leader (2017-2020).

• Ph.D. in Physics, McMaster University, Canada (1999)
• B.Sc. in Physics, St. Francis Xavier University, Canada (1993)

His research centers on quantum materials investigation through neutron scattering techniques, specializing in quantum magnetism phenomena including spin liquids, topological magnons, and frustrated magnetic systems. Recent work examines field-induced quantum phase transitions in honeycomb lattice materials like α-RuCl3 and YbCl3, while earlier contributions established foundational understanding of iron-based superconductors. His experimental approach combines advanced spectrometer development with precision measurements of magnetic excitations across diverse quantum materials platforms.

Lumsden's publication trends reveal sustained focus on quantum magnetic phenomena since 2005, with increasing emphasis on Kitaev materials and topological magnonics after 2015. His work spans condensed matter physics, materials science, and neutron instrumentation, characterized by collaborations across international facilities and frequent appearances in high-impact journals including Physical Review B, Nature Communications, and npj Quantum Materials.

• Fellow, American Association for the Advancement of Science (2021)
• Fellow, Neutron Scattering Society of America (2018)
• ORNL Director's Award for Research Accomplishment (2016, 2009)
• Fellow, American Physical Society (2015)
• Gordon Battelle Award for Scientific Research (2011)

As Section Head, Lumsden directs a major neutron science capability while maintaining active research programs funded through DOE Office of Science grants. His leadership includes managing the SPICE data acquisition system development (recognized with 2005 ORNL Significant Event Award) and coordinating multi-institutional teams studying quantum spin liquids. Current projects investigate topological magnon gaps and quantum criticality in frustrated magnets, leveraging ORNL's world-leading neutron facilities.

Lumsden's Spectroscopy Section operates integrated neutron scattering capabilities across HFIR's triple-axis spectrometers and SNS's time-of-flight instruments including CNCS, HYSPEC, SEQUOIA, and ARCS. His team develops advanced methodologies for measuring quantum magnetic excitations under extreme conditions (high magnetic fields, low temperatures), supporting both in-house research and external user programs through ORNL's user facilities.