Joint annual meeting of Swiss and Austrian Physical Societies 2017

【665】 Orbital character of the mobile and localized electron states at the LAO/STO interface

24 Aug 2017, 17:45

15m

Talk Emergent phenomena in novel low-dimensional materials Emergent Phenomena in Novel Low-Dimensional Materials

Speaker

Alla Chikina (Swiss Light Source, Paul Scherrer Institut)

Description

Oxygen vacancies at the LAO/STO interface leave two vacant electrons, one of which stays localized at the Ti3+ ion and another joins the mobile 2DES. The localized electrons in double and higher-order configurations of the VOs may account for the interface ferromagnetism [1]. The mobile ones, coupled to phonon modes by strong e-ph interaction, form large multiphonon polarons fundamentally reducing the 2DES mobility [2]. We use resonant soft-X-ray ARPES and combined density functional (DFT) + dynamical mean field theory (DMFT) to establish orbital character of the mobile and localized electron states at the LAO/STO interface created by the VOs.

[1] F. Lechermann et al., Physical Review B, 90(8), 85125 (2014).
[2] C. Cancellieri et al., Nature Communications 7, 10386 (2016).