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TT: Fachverband Tiefe Temperaturen
TT 6: Topological Superconductors
TT 6.1: Vortrag
Montag, 9. März 2026, 09:30–09:45, CHE/0091
Experimental Signatures of Gate-Tuneable One-Dimensional Edge Channels in Bi2Se3 Josephson Junctions — •Feike van Veen1, Femke Witmans1, Jara Vliem2, Daniel Vanmaekelbergh2, Chuan Li1, and Alexander Brinkamn1 — 1MESA+ Institute for Nanotechnology, University of Twente, Hallenweg 15, 7522 NH Enschede, The Netherlands — 2Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands
The quantum spin Hall (QSH) effect exhibits helical edge channels that can be utilized in the development of quantum computing [1]. Such QSH states are expected to be present in the hybridization gap that opens at the Dirac point in ultrathin 3D topological insulators (TIs) when opposite topological surface states hybridize [2]. In a previous study, an enhanced density of states has been probed at the edges of ultrathin colloidal Bi2Se3 nanoplatelets (NPLs) with scanning tunnelling spectroscopy [3]. Here, we study superconducting transport properties of these Bi2Se3 NPLs and reveal strong signatures of a 1D edge state contribution. Moreover, we found experimental evidence of a thickness dependence as is described by theoretical frameworks [2]. We can deplete the NPLs, hereby destroying the supercurrent, allowing for an ”on” or ”off” mode of the JJs. These observations contribute to the understanding and development of (non)-topological JJs made of ultrathin 3D TIs and shed new light on previous studies on superconductivity induced in QSH states.
[1] 10.1103/RevModPhys.82.3045
[2] 10.1103/PhysRevB.97.075419
[3] 10.1021/acs.nanolett.3c04460
Keywords: Bismuthselenide; Josephson Junction; Topological Insulator; Surface Hybridization; Rashba Spin-Orbit coupling