Orateur
Chuan Li
(University of Twente)
Description
Feike van Veen1, Jara Vliem2, Femke Witmans3, Daniel Vanmaeckelberg4, Alexander Brinkman1, and Chuan Li1
1 MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
2 Institute of Physical and Theoretical Chemistry, University of T¨ubingen, D-72076 T¨ubingen, Germany
3 II. Physikalisches Institut, Universit¨at zu Koln, D-50937 Koln, Germany and
4 Debye Institute for Nanomaterials Science, Utrecht University, 3584 CC Utrecht, The Netherlands
- Email: chuan.li@utwente.nl
A limited number of material platforms hosting topologically protected edge channels have been experimentally confirmed since the first observation of the quantum spin Hall effect two decades ago. As the realization of topologically protected Majorana bound states remains elusive, the search for novel candidate quantum spin Hall insulators continues to attract significant interest. One promising route toward two-dimensional topological insulators, and ultimately Majorana physics, is offered by ultrathin three-dimensional topological insulators[1-3]. Recent scanning tunnelling spectroscopy measurements on ultrathin colloidal Bi2Se3 nanoplatelets revealed the presence of edge states [4]. Here, we report a superconducting transport study of this system, providing evidence for one-dimensional channels localized at the perimeter of the nanoplatelets. By tuning the back-gate voltage, we identify an insulating regime that is interpreted as a topologically trivial signature, and we discuss a possible Rashba-band origin of these edge channels. Nevertheless, the remarkable robustness of the states against magnetic field and their intriguingly narrow spatial extent remain fundamentally interesting and call for further investigation.
[1]. Liu, C.-X. et al. Phys. Rev. B 81, 041307 (2010)
[2]. Lu, H.-Z., Niu, Q., Shen, S.-Q, et al., Phys. Rev. B 81, 115407 (2010).
[3]. Linder, J., Yokoyama, T. & Sudbø, A. Phys. Rev. B 80, 205401 (2009).
[4]. Moes, J. R. et al., Nano Lett. 3c04460 (2024).
Auteur
Chuan Li
(University of Twente)