Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 11: Topological insulators II (joint session HL/TT)

HL 11.6: Vortrag

Montag, 12. März 2018, 16:30–16:45, A 151

Quantum interference phenomena in selectively grown topological insulator nanoribbons — •Jonas Kölzer¹, Daniel Rosenbach¹, Tobias Schmitt¹, Christian Weyrich¹, Peter Schüffelgen¹, Michael Schleenvoigt¹, Sarah Schmitt¹, Abdur Rehman Jalil¹, Gregor Mussler¹, Vincent Sacksteder², Detelev Grützmacher¹, and Thomas Schäpers¹ — ¹PGI-9, Forschungzentrum Jülich and JARA-FIT, Germany — ²Royal Holloway University of London, United Kingdom

Quantum topology offers a lot of intriguing physical phenomena and has a huge potential to realize robust quantum computing. Selectively deposited nano devices grown by means of molecular beam epitaxy (MBE) are a first step towards scalable topological insulator (TI) quantum computation.

In order to probe the evidence of topologically protected surface states, magneto conductance measurements are performed. In detail we studied quantum interference effects in the magneto conductance on selectively grown TI nanoribbons at low temperatures. From the conductance modulations we could trace distinct electron paths using FFT analysis in angular dependent measurements. Temperature dependent measurements reveal the quantum nature of the oscillations observed, since they vanish for increasing temperatures.

The next step in characterizing the material system will be to selectively grow Aharonov-Bohm ring structures to characterize quantum oscillations inside the van der Waals layer system.