Publications by authors named "Mojun Pan"
We present a detailed exposition of the design for time- and angle-resolved photoemission spectroscopy using a UV probe laser source that combines the nonlinear effects of β-BaB2O4 and KBe2BO3F2 optical crystals. The photon energy of the probe laser can be switched between 6.0 and 7.
View Article and Find Full Text PDFTime-resolved ARPES with tunable 12-21.6 eV XUV at 400 kHz repetition rate.
Rev Sci Instrum
April 2023
Time-resolved and angle-resolved photoemission spectroscopy (trARPES) is a powerful method to detect the non-equilibrium electronic structure in solid systems. In this study, we report a trARPES apparatus with tunable photon energy selectively among 12, 16.8, and 21.
View Article and Find Full Text PDFThe search for topological superconductivity (TSC) is currently an exciting pursuit, since non-trivial topological superconducting phases could host exotic Majorana modes. However, the difficulty in fabricating proximity-induced TSC heterostructures, the sensitivity to disorder and stringent topological restrictions of intrinsic TSC place serious limitations and formidable challenges on the materials and related applications. Here, we report a new type of intrinsic TSC, namely intrinsic surface topological superconductivity (IS-TSC) and demonstrate it in layered AuSn with T of 2.
View Article and Find Full Text PDFArticle Synopsis
- High-order harmonic generation (HHG) creates a wide spectrum of light from the vacuum ultraviolet to extreme ultraviolet range, making it ideal for detailed material analysis.
- The study presents a high-photon flux HHG source using a two-color laser field, achieving a photon output of 2 × 10^12 phs/s at 21.6 eV.
- A classical diffraction mounted grating monochromator was developed to cover photon energies from 12 to 40.8 eV, enhancing time resolution by minimizing pulse front tilt and addressing energy resolution broadening due to space charge effects.