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10 September 2019 Exploiting topological matter for Majorana physics and devices via molecular beam epitaxy (Conference Presentation)
Peter Schüffelgen, Daniel Rosenbach, Chuan Li, Tobias W. Schmitt, Michael Schleenvoigt, Sarah Schmitt, Abdur R. Jalil, Jonas Kölzer, Lidia Kibkalo, Martina Luysberg, Benjamin Bennemann, Umut Parlak, Doris Meertens, Stephan Trellenkamp, Gregor Mussler, Thomas Grap, Meng Wang, Erwin J. Berenschot, Niels R Tas, Alexander A. Golubov, Alexander Brinkman, Thomas Schäpers, Detlev Grützmacher
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Proceedings Volume 11090, Spintronics XII; 110902D (2019) https://doi.org/10.1117/12.2527294
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
Abstract
In this work, a novel fabrication technique is presented, which allows to construct topological insulator - superconductor (TI-SC) hybrid devices of high quality under UHV conditions. A stencil mask is applied to the substrate before growth of (Bi,Sb)2Te3 TI thin films by means of molecular beam epitaxy. The shadow mask is used for stencil lithography of superconductive electrodes on top of the topological thin films. Finally, the ready devices are covered with a capping layer to protect the surfaces of TI and S from oxidation at ambient conditions. Besides the full device fabrication under UHV conditions, it is important to choose the right material combination. While superconductive aluminum (Al) electrodes on top of (Bi,Sb)2Te3 thin films yielded a low interface quality, measurements on (Bi,Sb)2Te3 films with niobium (Nb) electrodes, however, provided a high interface transparency. In radio frequency experiments a missing first Shapiro step was detected in our Nb - (Bi,Sb)2Te3 - Nb junctions, indicating signatures of Majorana bound states. To exploit our stencil technique to more complex device layouts for proposed topological quantum computational applications, the mask was attached to pre-patterned Si substrates. This allowed us to combine selective area growth of topological nanostructures and stencil lithography of superconductive electrodes with nm precision, paving the way for fabrication of elaborated Majorana devices.
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Peter Schüffelgen, Daniel Rosenbach, Chuan Li, Tobias W. Schmitt, Michael Schleenvoigt, Sarah Schmitt, Abdur R. Jalil, Jonas Kölzer, Lidia Kibkalo, Martina Luysberg, Benjamin Bennemann, Umut Parlak, Doris Meertens, Stephan Trellenkamp, Gregor Mussler, Thomas Grap, Meng Wang, Erwin J. Berenschot, Niels R Tas, Alexander A. Golubov, Alexander Brinkman, Thomas Schäpers, and Detlev Grützmacher "Exploiting topological matter for Majorana physics and devices via molecular beam epitaxy (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 110902D (10 September 2019); https://doi.org/10.1117/12.2527294
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KEYWORDS
Molecular beam epitaxy
Electrodes
Niobium
Physics
Photomasks
Thin films
Aluminum
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