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• Ruixing Zhang (Department of Physics and Astronomy, University of Tennessee Knoxville)

Travel to IAMM.

Research Meeting

• Ruixing Zhang (Department of Physics and Astronomy, University of Tennessee Knoxville)

Room: 323

Unconventional quantum states in a kagome superconductor Room: 147 The kagome lattice offers a unique electronic landscape characterized by flat bands and van Hove singularities—features that enhance electronic correlations and drive instabilities such as superconductivity and charge density waves. As a result, kagome systems host a rich array of emergent many-body quantum phases, some exhibiting unconventional behavior. In this talk, I will present our investigation of the kagome-lattice superconductors AV₃Sb₅ (A = K, Cs), a family of materials that have garnered significant recent attention due to the presence of chiral charge order—potentially breaking time-reversal symmetry—alongside nematicity and superconductivity with an ungapped Fermi surface sheet. First, I will describe how we probed broken symmetries in the normal state using the material’s nonlinear electromagnetic response to circularly polarized light [1]. Next, I will discuss our discovery of two distinct superconducting regimes in CsV₃Sb₅, intriguingly without any clear phase transition between them [2]. These regimes exhibit sharply different characteristics: the low-temperature phase reveals a second superconducting gap and supports low-energy quasiparticles, potentially arising from a nodal gap structure. I will conclude with a discussion of the broader implications of these findings and mention our ongoing efforts to understand these kagome superconductors.

Research Meeting

• Wonhee Ko (University of Tennessee, Knoxville)

Room: 233

Research Meeting

• Hanno Weitering

Research Meeting

• Steve Johnston (University of Tennessee)

Room: 330

Research Meeting

• Songyang Pu

Room: 105

Research Meeting

• Yishu Wang (University of Tennessee Knoxville)

Room: 312

Research Meeting

• Ruixing Zhang (Department of Physics and Astronomy, University of Tennessee Knoxville)

Room: 262