Abstract :
[en] Perovskite oxides are already widely used in industry and have huge potential for novel device
applications thanks to the rich physical behaviour displayed in these materials. The key to the
functional electronic properties exhibited by perovskites is often the so-called Jahn-Teller distortion.
For applications, an electrical control of the Jahn-Teller distortions, which is so far out of reach,
would therefore be highly desirable. Based on universal symmetry arguments, we determine new
lattice mode couplings that can provide exactly this paradigm, and exemplify the effect from firstprinciples
calculations. The proposed mechanism is completely general, however for illustrative
purposes, we demonstrate the concept on vanadium based perovskites where we reveal an
unprecedented orbital ordering and Jahn-Teller induced ferroelectricity. Thanks to the intimate
coupling between Jahn-Teller distortions and electronic degrees of freedom, the electric field control
of Jahn-Teller distortions is of general relevance and may find broad interest in various functional
devices.
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