Seminars Archive

From Spins to Supercurrents: Experimental Journey at the Edge of Quantum Materials

Abstract
Over the last decades, condensed matter physics has been the active playground for the realization of physical systems in which quantum effects persist over a wide range of energy and length scales [1]. The resulting quantum materials include topological insulators, topological crystalline insulators, magnetically doped topological quantum materials, 2-dimensional van der Waals (2D vdW) materials, superconductors, Kitaev- , and spin-orbit-materials, etc... [2].
An overview is here given on the most relevant research results lately achieved by the QMag group on emergent phenomena in quantum materials, with particular attention to topology, symmetry, spin-orbit coupling and superconductivity. The summary overarches the demonstration of Rashba spin-orbit coupling in wurtzite n-GaN:Si [3,4], the intriguing electronic characteristics that emerge in the Mn doped topological crystalline insulator SnTe [5] and in the intrinsic ferromagnetic topological insulator Mn(Sb,Bi)2Te4. Moreover, it is shown that the study of 2D topological semimetals has revealed (i) quantum chiral anomaly in mechanically exfoliated flakes of the Weyl semimetal Td-WTe2 up to a record temperature of 100 K [6], (ii) Pt vacancy-induced Kondo effect in non-magnetic PtSe2 [7] and (iii) a topological Lifshitz transition up to a transition temperature of 150 K in ZrTe5. Finally, a bosonic island percolation model in dilute Fe doped superconducting NbN thin films is briefly introduced [8].

alberta.bonanni@jku.at

References
1. B. Keimar et al. Nat. Phys. 13, 1045 (2017).
2. F. Giustino et al. J. Phys. Mater. 3, 042006 (2020).
3. W. Stefanowicz et al. Phys. Rev. B 89, 205201 (2014).
4. R. Adhikari et al. Phys. Rev. B 94, 085205 (2016).
5. R. Adhikari et al. Phys. Rev. B 100, 134422 (2019).
6. R. Adhikari et al. Nanomaterials 11, 2755 (2021).
7. J. Salchegger et al. Phys. Rev. B 110, 205403 (2024).
8. R. Adhikari et al. Nanomaterials 12, 3105 (2022).