Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.5: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

Heteroepitaxial YBiO₃ thin films grown by pulsed laser depostion — •Marcus Jenderka, Marius Grundmann, and Michael Lorenz — Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig. Germany

The cubic perovskite YBiO₃ (YBO) has recently been predicted to be a novel oxide topological insulator candidate by first-principles calculations [1]. In the past, YBO was used as a buffer layer for the high-temperature superconductor YBa₂Cu₃O_7−y. [2] Its large bulk band gap and high bulk resistivity distinguishes YBO from conventional TIs such as Bi₂Te₃. [3,4] Thus, room-temperature operation and the separation of surface from bulk degrees of freedom promise better TI-based devices.

Here, we report on heteroepitaxy of YBO thin films grown by pulsed laser deposition (PLD) on LaAlO₃ single crystalline substrates. Resistivity dependent on magnetic field and film thickness is measured from 300 to 15 K to find signatures of a topological insulator phase.

[1] H. Jin et al., Scientific Reports 3, 1651 (2013).

[2] G. Li et al., J. Mater. Res. 22, 2398-2403 (2007).

[3] Y. Xia, Y. et al., Nat. Phys. 5, 398-402 (2009).

[4] H. Zhang et al., Nat. Phys. 5, 438-442 (2009).