2nd NeXUS User Workshop Held July 25-26
Workshop by the Numbers:
120 Virtual attendees to the plenary session
59 Institutions represented
12 Countries represented
20 Working Group panelists
Anne L’Huillier, Lund University – “Attosecond light pulses for the study of electron dynamics in matter” Watch recording
David Awschalom, University of Chicago – “The quantum revolution: exploring materials for new technologies”
NeXUS co-director Robert Baker – NeXUS overview and facility updates Watch recording
A special Thank You to the panelists who attended our in-person Working Groups on July 25 & 26 at The Ohio State University! These working groups are developing recommendations for first NeXUS science in the fields of:
Quantum Materials and Condensed Matter Physics
Attosecond Electronic and Molecular Dynamics
Liquid Phase and Interfacial Chemical Dynamics
Dynamics in Biological Systems
View Panelist Roster
We thank you for your hard work and enthusiasm in guiding NeXUS forward!
Meet the NeXUS Staff
TJ Ronningen, NeXUS Project Manager
System Spotlight –
The NeXUS Scanning Tunneling Microscope (STM) End Station
The scanning tunneling microscope (STM) end station combines the atomic scale spatial and electronic characterization capabilities of an STM with XUV light to add elemental contrast and ultra-fast temporal resolution. While STM has matured into an essential tool in nanoscience, a lack of element-specificity in imaging, and poor time resolution remains a challenge with typical instruments. In the NeXUS STM, XUV pulses will illuminate the tunnel junction, thus allowing access to element-specific core level transitions and ultrafast time resolution. As the energy of the XUV is tuned above a core transition of a particular element, electrons will be emitted from the sample and locally collected by a customized STM tip. The ability to perform optical pump-optical probe, as well as optical pump-XUV probe, experiments adds capability for ultra-fast, atomic scale, measurements of carrier dynamics at surfaces and interfaces. The STM operates in ultra-high vacuum and utilizes a closed cycle cryocooler which allows for uninterrupted measurements of atomically clean surfaces at cryogenic (11 K) temperatures. The instrument was installed in July 2021 and is fully operational, allowing the initial characterization measurements shown here, as well as the development of remote operation for users.
(top) Image of the STM in the NeXUS laser lab. The STM chamber is on a concrete slab for vibration stabilization, and the enclosure for the closed cycle cooler is to the left of the chamber. The optical table can be seen in the background behind the chamber. (right) Image taken by the STM of the Au(111) surface at 11 K showing the characteristic herringbone reconstruction, as well as a single atomic step. (bottom left) The corrugation of the herringbone pattern can be seen in the line trace and indicates a tip stability of < 2 pm. (bottom center) STM temperature during an initial cool down to a base temperature of 11 K. The inset shows temperature stability better than 350 mK over a week with no user-added cryogens.