We fabricate and characterize quantum materials with atomic thicknesses at femtosecond time scales. Utilizing the first-of-its-kind Multi-Resolution Spatial and Temporal Engineering Platform (MRSTEP), we employ molecular beam epitaxy to engineer quantum materials layer-by-layer, and characterize the electronic structures of these materials using equilibrium and non-equilibrium photoemission spectroscopy. The holistic probing of quantum materials in the domains of energy, momentum, space, and time allows us to gain deep understanding of macroscopic quantum phenomena, and connect the material properties to applications in spintronics, topotronics, and quantum information sciences. We are particularly interested in quantum phenomena emerging at material interfaces, such as interfacial superconductivity and various topological orders. We are also developing new instrumentation which will allow us to print reconfigurable quantum circuits at sub-micron scales.
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Quantum matter under intense optical excitations can exhibit a range of exotic phenomena, such as metastable charge order and light-modulated superconductivity. In our laboratory, we aim to understand, manipulate, and utilize these transient phases of matter and investigate how we stabilize these exotic phases for longer period of time - eventually locking the transient matter in time. We combine atomic-scale thin film deposition - molecular beam epitaxy, and state-of-the-art time-domain electron spectroscopies. In particular, we use a revolutionary scheme - a cavity-enhanced optical excitation to stabilize transient phases for nanosecond or even longer time scale, eventually enabling applications of these quantum phenomena.
S.-L. Yang, J. A. Sobota, Y. He, D. Leuenberger, H. Soifer, H. Eisaki, P. S. Kirchmann, and Z.-X. Shen. Physical Review Letters 122, 176403 (2019).
H. Soifer, A. Gauthier, A. F. Kemper, C. R. Rotundu, S.-L. Yang, H. Xiong, D. Lu, M. Hashimoto, P. S. Kirchmann, J. A. Sobota, and Z.-X. Shen. Phys. Rev. Lett. 122, 167401
S.-L. Yang, J. A. Sobota, Y. He, Y. Wang, D. Leuenberger, H. Soifer, M. Hashimoto, D. H. Lu, H. Eisaki, B. Moritz, T. P. Devereaux, P. S. Kirchmann, and Z.-X. Shen. Phys. Rev. B 96, 245112
S. Gerber*, S.-L. Yang*, et al. Science 357, 71-75 (2017).
S.-L. Yang, J. A. Sobota, D. Leuenberger, Y. He, M. Hashimoto, D. H. Lu, H. Eisaki, P. S. Kirchmann, and Z.-X. Shen. Phys. Rev. Lett. 114, 247001
Shuolong Yang, Jonathan A. Sobota, Dominik Leuenberger, Alexander F. Kemper, James J. Lee, Felix T. Schmitt, Wei Li, Rob G. Moore, Patrick S. Kirchmann, and Zhi-Xun Shen. Nano Letters 2015 15 (6), 4150-4154