Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 55: Topology and symmetry protected materials & Topological insulators (joint session O/HL/TT)
TT 55.2: Vortrag
Mittwoch, 11. März 2026, 15:15–15:30, HSZ/0401
Intrinsic topological superconductivity revealed by surface-extended Andreev bound states in PtBi2 — •Xiaochun Huang1, Lingxiao Zhao2, Sebastian Schimmel3,4, Julia Besproswanny3,4, Patrick Härtl1, Christian Hess3,4, Bernd Büchner4,5, and Matthias Bode1 — 1Experimentelle Physik 2, Physikalisches Institut, Universität Würzburg, Germany — 2Quantum Science Center of Guangdong, Shenzhen, China — 3Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Germany — 4Leibniz-Institute for Solid State and Materials Research, Dresden, Germany — 5Technische Universität Dresden, Germany
Intrinsic topological superconductivity remains a central question in condensed-matter physics.
The three-dimensional Weyl semimetal PtBi2 was recently shown
by angle-resolved photoemission spectroscopy to host a superconducting gap
that opens exclusively on its Fermi-arc surface states with a nodal structure,
establishing it as a prime candidate for intrinsic topological superconductivity [1].
Using scanning tunneling microscopy and spectroscopy, we directly visualize
surface-extended Andreev bound states (ABSs) across atomically pristine terraces
within a sizable superconducting gap (Δ > 10 meV) in PtBi2.
Quantitative analysis of the tunneling spectra within an anisotropic chiral pairing framework
identifies these ABSs as signatures of an emergent Majorana-cone dispersion.
Our findings provide a definitive real-space spectroscopic fingerprint of intrinsic topological superconductivity in PtBi2.
[1] A. Kuibarov et al., Nature 626, 294 (2024)
Keywords: Intrinsic topological superconductivity; Andreev bound states; Scanning tunneling microscopy and spectroscopy