Jahn-Teller states mixed by spin-orbit coupling in an electromagnetic field
Alejandro S. Miñarro, Gervasi Herranz
Phys. Rev. B 106, 165108 – (2022) https://doi.org/10.1103/PhysRevB.106.165108
Electrical characterization and extraction of activation energies of the defect states in the LaAlO3/SrTiO3 heterostructure
Yoann Lechaux, Yu Chen, Albert Minj, Florencio Sánchez, Gervasi Herranz, Laurence Méchin, and Bruno Guillet
Dynamic control of octahedral rotation in perovskites by defect engineering
Jiahui Jia, Xu He, Arsalan Akhtar, Gervasi Herranz, and Miguel Pruneda
Phys. Rev. B 105, 224112 – (2022)
Photoinduced Persistent Electron Accumulation and Depletion in LaAlO3/SrTiO3 Quantum Wells
Yu Chen, Yoann Lechaux, Blai Casals, Bruno Guillet, Albert Minj, Jaume Gázquez, Laurence Méchin, and Gervasi Herranz Phys. Rev. Lett. 124, 246804 (2020) https://doi.org/10.1103/PhysRevLett.124.246804
Persistent photoconductance is a phenomenon found in many semiconductors, by which light induces long-lived excitations in electronic states. Commonly, persistent photoexcitation leads to an increase of carriers (accumulation), though occasionally it can be negative (depletion). Here, we present the quantum well at the LaAlO3/SrTiO3 interface, where in addition to photoinduced accumulation, a secondary photoexcitation enables carrier depletion. The balance between both processes is wavelength dependent, and allows tunable accumulation or depletion in an asymmetric manner, depending on the relative arrival time of photons of different frequencies. We use Green’s function formalism to describe this unconventional photoexcitation, which paves the way to an optical implementation of neurobiologically inspired spike-timing-dependent plasticity.
Gap suppression at a Lifshitz transition in a multi-condensate superconductor
We have participated in this work, with a collaboration with Nicolas Bergeal (ESPCI-Paris-CNRS). Check our work, recently published in Nature Materials (https://doi.org/10.1038/s41563-019-0354-z).
For a brief summary of this research, please, read this note.
A New Critical Thickness at Polar Interfaces
Magneto-optical response of polarons
Charge transfer in Ce-doped YIG