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As reported in a new Science Advances paper, the JILA team and collaborators from universities in Sweden, Greece, and Germany probed the spin dynamics within a special material known as a Heusler compound: a mixture of metals that behaves like a single magnetic material. For this study, the researchers utilized a compound of cobalt, manganese, and gallium, which behaved as a conductor for electrons whose spins were aligned upwards and as an insulator for electrons whose spins were aligned downwards.

Recently graduated Ph.D. researchers Bin Wang and Nathan Brooks, working with JILA Fellows Margaret Murnane and Henry Kapteyn, developed a novel method that uses short-wavelength light with a special vortex or donut shape to scan these repeating surfaces, resulting in more varied diffraction patterns. This allowed the researchers to capture high-fidelity image reconstructions using this new approach, which they recently published in Optica.

To honor students' abilities for clear and effective communication in quantum physics, Optica offers a yearly "best paper" award at its International Conference on Advanced Solid State Lasers. This year, JILA graduate student Daniel Carlson was among the list of winners, with his presentation "Carbon K-Edge Soft X-Rays Driven by a 3 µm,1 kHz OPCPA Laser System" winning over the judges.

While academia has traditionally been the primary path for physicists, the industrial sector offers unique opportunities and advantages. This was certainly the case for Dr. Bin Wang, who was recently a JILA postdoctoral researcher, now a Senior Software Engineer at ASML.

JILA graduate student Yingchao Zhang, working with JILA Fellows Henry Kapteyn and Margaret Murnane and University of Colorado Boulder physics professor Rahul Nandkishore, utilized a powerful new method to precisely identify phonon interactions within quantum materials, the results of which were published in Nano Letters. Using ultraprecise, timed laser pulses, and extreme ultraviolet pulses, they measured the response times and saw precisely how the electrons and phonons interacted. This method paves the way for better control and manipulation of quantum materials.

Renowned scientist, JILA Fellow, and University of Colorado Boulder professor Margaret Murnane has been granted an honorary doctorate from the prestigious University of Salamanca, recognizing her outstanding contributions to the field of ultrafast laser science. As a trailblazer in her field, Murnane's groundbreaking research has revolutionized our understanding of light and opened up new avenues for scientific discovery and technological innovation. This esteemed recognition from one of the oldest universities in the world serves as a testament to Murnane's remarkable achievements and lasting impact on the scientific community.

To better understand heat transport at the nanoscale, JILA Fellows Margaret Murnane, Henry Kapteyn, and their research groups within the STROBE NSF Center, JILA, and the University of Colorado Boulder, created the first general analytical theory of nanoscale-confined heat transport, that can be used to engineer heat transport in 3D nanosystems—such as nanowires and nanomeshes—that are of great interest for next-generation energy-efficient devices. This discovery was published in NanoLetters.

Two-dimensional materials, like graphene and 2D semiconductors, are an area of physics that has been growing tremendously in the last decade. According to JILA graduate student Ben Whetten, “That’s because they exhibit new spin and electronic physical phenomena and have much promise to build new miniaturized photonic or semiconductor nanoscale devices.” Researchers like Whetten, and his advisor, JILA Fellow, and University of Colorado Boulder professor Markus Raschke, develop methods to image these materials, giving a better understanding of their inner workings. In a new paper in NanoLetters, Raschke, and his team extended their ultrafast microscope to see nanometer-sized imperfection(s) within a 2D semiconductor sample that created some surprising nonlinear optical effects.

Chen-Ting Liao and the Kapteyn-Murnane group from JILA have developed and implemented a new method to use x-ray beams to capture the 3D magnetic texture in a material with very high 10-nanometer spatial resolution for the first time. They published their new technique and new scientific findings in Nature Nanotechnology.

JILA Fellow and University of Colorado Boulder Distinguished Professor Andreas Becker has been awarded a 2023 fellowship to Optica (formerly the Optical Society of America). Becker's work at JILA focuses on the analysis and simulation of ultrafast phenomena in atoms, molecules, and clusters, in particular attosecond electron dynamics, coherent control, and molecular imaging. Using special laser frequencies, Becker and his team are able to study the dynamics of these atoms and molecules in different time scales.