ABSTRACT
The interactions among the macroscopic number of electrons in crystalline solids can lead to the emergence of new states of matter that cannot be described by the properties of the individual constituents. Quantum materials, in which ‘emergent’ phenomena are manifest, have become a recent focus of condensed matter research. The recent advent in creating high magnetic fields in a controlled environment offers the opportunity to probe the electronic ground state at low temperatures in the absence of thermal perturbations and understand how the underlying electronic structure gives rise to their unconventional properties. These electronic characteristics are often encoded in the Fermi surface, the locus in the moment space of gapless low-energy excitations. In this talk, I will review recent experimental discoveries of strange metallic behavior in materials on the brink of metal-insulator transitions, namely Kondo insulators, Mott insulators, and a candidate Mott-Kondo system. In SmB6, an archetypal Kondo insulator with 4f electrons, the observation of magnetic quantum oscillations indicates the existence of a coherent Fermi surface within its insulating bulk [1]. In the cuprate superconductor YBa2Cu3O6+x, quantum oscillations are found to coexist with d-wave superconductivity in the underdoped regime [2], contrasting the strange metallic states with T-linear resistivity and H-linear magnetoresistance in overdoped cuprates [3]. Lastly, I will present new results of the magnetotransport study in infinite-layer nickelates, which reveals a regime of unconventional metallic behavior in this emerging model system for unconventional superconductivity [4]. These results highlight exposing materials in the proximity of metal-insulator transitions to high magnetic fields as a promising avenue for discoveries in quantum solids.
References [1] Tan et al., Science 349, 287 (2015); [2] Hsu et al., PNAS 118, e2021216118 (2021); [3] Ayres et al., Nature 595, 661 (2021); [4] Hsu et al., Phys. Rev. Res. 3, L042015 (2021)
BIOGRAPHY
Dr Hsu received his BSc in Materials Science and Engineering from National Tsing Hua University in Taiwan, MS in Materials Physics from Linköping University in Sweden, and PhD in Physics from Cambridge University in the UK. In 2018 He moved to the High Field Magnet Laboratory at Radboud University in Nijmegen, the Netherlands as a postdoc researcher, and he is currently a research scientist at Radboud University working with Prof. Nigel Hussey. His current research interests include complex oxides, unconventional superconductivity, topological transport, and developing high-sensitivity experiments under high magnetic fields.
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