Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 76: Poster Session: Transport 2

TT 76.11: Poster

Thursday, March 23, 2017, 15:00–19:00, P2-OG1

Ohmic Contacts on HgTe Quantum wells - a SEM study — •Simon Hartinger, Johannes Kleinlein, Hartmut Buhmann, and Laurens W. Molenkamp — EP3, Physikalisches Institut, Universität Würzburg

In HgTe/CdTe quantum wells above a critical thickness one can observe the topological nature of these heterostructures, called Quantum Spin Hall Effect and, in addition, the quantum Hall effect in high magnetic fields. One crucial part to observe the QSHE and the QHE is the microscopic nature of the contact material, which, for example, can cause contact problems in high magnetic fields. In this work we focus on the interface between ohmic contacts and HgTe/CdTe based quantum wells. We show SEM images of HgTe quantum wells cross sections with different contacts prepared by Focused Ion Beam milling, to analyze the intermixing of the contact material and the Quantum Well heterostructure.