Shunsuke Yoshizawa has been a senior researcher at NIMS since 2018. He received his Ph.D. degree from Shunsuke Yoshizawa has been a senior researcher at NIMS since 2018. He received his Ph.D. degree from the Tokyo Institute of Technology in 2010. He started his career as a project researcher at the Institute for the Tokyo Institute of Technology in 2010. He started his career as a project researcher at the Institute for Solid State Physics, the University of Tokyo in 2010. He moved to NIMS as a postdoctoral researcher in Solid State Physics, the University of Tokyo in 2010. He moved to NIMS as a postdoctoral researcher in 2012 and became an ICYS (International Center for Young Scientists) researcher in 2015. His main research 2012 and became an ICYS (International Center for Young Scientists) researcher in 2015. His main research topic is the nanoscale spectroscopic investigation of superconductors and topological materials using low-topic is the nanoscale spectroscopic investigation of superconductors and topological materials using low-temperature scanning tunneling microscopy. He is interested in the visualization of physical phenomena by temperature scanning tunneling microscopy. He is interested in the visualization of physical phenomena by tuning the measurement and analysis methods best suited to the target.tuning the measurement and analysis methods best suited to the target.4040[1] S. Yoshizawa, K. Sagisaka, and H. Sakata, Phys. Rev. Lett. 132, 056401 (2024).[1] S. Yoshizawa, K. Sagisaka, and H. Sakata, Phy. Rev. Lett. 132, 056401 (2024).[2] K. Nakanishi and H. Shiba, J. Phys. Soc. Jpn., 52, 1278 (1983).[2] K. Nakanishi and H. Shiba, J. Phys. Soc. Jpn., 52, 1278 (1983).Abstract Abstract Imaging Quantum Phenomena with Scanning Tunneling MicroscopyImaging Quantum Phenomena with Scanning Tunneling MicroscopyShunsuke YoshizawaShunsuke YoshizawaSenior Researcher, Nanoprobe Group, Center for Basic Research on Materials (CBRM),Senior Researcher, Nanoprobe Group, Center for Basic Research on Materials (CBRM),National Institute for Materials Science (NIMS)National Institute for Materials Science (NIMS)NIMS Talk: S3-4NIMS Talk: S3-4Scanning tunneling microscopy (STM) measures the electronic density of states near the Fermi energy Scanning tunneling microscopy (STM) measures the electronic density of states near the Fermi energy with atomic-scale spatial resolution. It is also compatible with low temperatures and high magnetic fields, with atomic-scale spatial resolution. It is also compatible with low temperatures and high magnetic fields, playing an important role in the study of quantum materials. Our cryogenic, high-field STM system features playing an important role in the study of quantum materials. Our cryogenic, high-field STM system features low temperatures down to 0.4 K, high magnetic fields up to 16 T, and ultra-high vacuum chambers to prepare low temperatures down to 0.4 K, high magnetic fields up to 16 T, and ultra-high vacuum chambers to prepare clean surfaces. Here we will briefly present some examples of our STM data and then focus on the result on the clean surfaces. Here we will briefly present some examples of our STM data and then focus on the result on the transition metal dichalcogenide 2H-NbSe2. transition metal dichalcogenide 2H-NbSe2. 2H-NbSe2 is a layered compound that exhibits charge density waves (CDWs) below ~30 K. It also 2H-NbSe2 is a layered compound that exhibits charge density waves (CDWs) below ~30 K. It also undergoes a superconducting transition at ~7 K. The superconducting state coexists with the CDW state, and undergoes a superconducting transition at ~7 K. The superconducting state coexists with the CDW state, and the interplay between the two states is of increasing interest. With this question in mind, we first investigated the interplay between the two states is of increasing interest. With this question in mind, we first investigated the unknown aspects of the CDW structure; previous STM studies reported the existence of two types of the unknown aspects of the CDW structure; previous STM studies reported the existence of two types of lattice-commensurate CDW structures on the same surface, but the spatial distribution of their domains was not lattice-commensurate CDW structures on the same surface, but the spatial distribution of their domains was not clearly resolved. We have developed a numerical method to accurately determine the local CDW structure from clearly resolved. We have developed a numerical method to accurately determine the local CDW structure from our high-resolution STM image and clearly define the spatial distribution of the domains. Our result shows the our high-resolution STM image and clearly define the spatial distribution of the domains. Our result shows the formation of alternating triangular domains of the two types of structures, which is in good agreement with the formation of alternating triangular domains of the two types of structures, which is in good agreement with the predictions of a phenomenological theory proposed before the widespread use of STM [2].predictions of a phenomenological theory proposed before the widespread use of STM [2].
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