SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Superconductivity: Properties and Electronic Structure

TT 3.2: Vortrag

Montag, 27. März 2023, 09:45–10:00, HSZ 103

Symmetry breaking and emergent phases in a noncentrosymmetric superconductor — •Feifan Wang¹, Xianghan Xu², Sang-Wook Cheong², and Manfred Fiebig¹ — ¹Dept. of Materials, ETH Zurich, Switzerland — ²Dept. of Physics and Astronomy, Rutgers University, USA

Symmetry breaking raises rich physics in condensed matters, such as Rashba splitting, Weyl fermions, unconventional superconducting, multiferroic ordering, etc. Nonlinear optical processes, being extremely sensitive to material symmetries, offer a direct access to the observation of subtly broken or even hidden symmetries. Here we discover emergant phases in a noncentrosymmetric superconductor, Mo3Al2C, and resolve the symmetry lowering using second harmonic generation measurements. Together with temperature-dependent electronic conductivity measurements, the phase transition from a normal metal at high temperatures to a charge-density-wave state is proposed. In the former, all mirror symmetries are broken bringing in the structural chirality. The correlation between superconductivity/charge-density-wave transition and noncentrosymmetry/chirality will then be discussed. Exotic properties in a low-symmetry system such as Mo3Al2C may add new ingredients to the strong-correlation physics.