Electronic subband reconfiguration in a d0-perovskite induced by strain-driven structural transformations
- Laukhin, V.
- Copie, O.
- Rozenberg, Marcelo Javier
- Weht, Ruben Oscar
- Bouzehouane, K.
- Reyren, N.
- Jacquet, E.
- Bibes, M.
- Barthélémy, A.
- Herranz, G.
DOIAbstract
It is well known that transport in lightly n-doped SrTiO3 involves light and heavy electron bands. We have found that upon application of moderate quasi-isotropic pressures, the relative positions of these subbands are changed by a few meV and, eventually, a band inversion occurs at ∼1kbar. Such effects are, however, suppressed in the closely related KTaO3 perovskite. We show that the extremely subtle electronic reconfiguration in SrTiO3 is triggered by strain-induced structural transformations that are accompanied by remarkable mobility enhancements up to about Δμ/μ 300%. Our results provide a microscopic rationale for the recently discovered transport enhancement under strain and underscore the role of the internal structural degrees of f...
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