Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 105: Poster: Topological insulators (with MA/O)

HL 105.10: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Heteroepitaxial Li2IrO3 Thin Films Grown by Pulsed Laser Deposition — •Marcus Jenderka, Heiko Frenzel, Rüdiger Schmidt-Grund, Marius Grundmann, and Michael Lorenz — Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig. Germany

The layered perovskite oxides A2IrO3 (A = Na, Li) have been studied in recent years in terms of a physical realization of spin-liquid [1] and topological insulator [2] phases, desired within certain quantum computation proposals. We report on the pulsed laser deposition of heteroepitaxial Li2IrO3 films on ZrO2:Y(001) single crystalline substrates. As in Na2IrO3 [3], X-ray diffraction confirms a preferential (001) out-of-plane crystalline orientation with a defined in-plane epitaxial relationship. Resistivity between 35 and 300 K is dominated by a three-dimensional variable range hopping mechanism. Infrared optical transmission from 0 to 1.85 eV, measured by Fourier transform infrared spectroscopy (FTIR), reveals a small optical gap Ego ≈ 300 meV together with a splitting of the 5d-t2g manifold caused by the interplay of spin-orbit coupling and electronic correlations. By means of infrared spectroscopic ellipsometry, the dielectric function (DF) is presented in the spectral range between 0.03 and 3.50 eV. The calculated absorption coefficient confirms the value for Ego.

[1] J. Chaloupka et al., Physical Review Letters 105, 027204 (2010).

[2] H.-S. Kim et al., Physical Review B 87, 165117 (2013).

[3] M. Jenderka et al., Physical Review B 88, 045111 (2013).

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