Polarons are quasiparticles that originate from coupling of excess electrons
or holes with lattice vibrations 1. They play a central role in many
materials properties, such as electric transport, optical properties, surface
reactivity, superconductivity or magnetoresistance. Certain types of polarons
(small polarons) can localize at a single lattice site, become immobile and
exhibit hopping motion. The task of this Thesis is using the noncontact Atomic
Force Microscopy to observe these localized polarons and investigate their
hopping kinetics induced by thermal fluctuations, light or tip's electric
field. The system of choice will be mainly perovskites that are close to the
ferroelectric state, namely titanates and tantalates for (KTaO3, KNbO3,
SrTiO3 or BaTiO3). A part of the challenge lies in distinguishing the
polarons from ferroelectric polarization, which is easily induced by the tip.
The candidate will be encouraged to spend at least 6 months abroad with one of
our collaborators in Austria, Germany or Japan.
1 C. Franchini, M. Reticcioli, M. Setvin, U. Diebold, Neture Reviews
Materials 6, 560 (2021)
Research Field: Physics › Condensed matter properties Physics › Solid
Location: France › MONTPELLIER
spin and optical properties of the boron vacancy defect in hBN with a scanning
The objective of the project is to...
Location: Poland › Kraków
We are offering a 3-years-long postdoc position funded by National Science
Center, Poland under the project "Quantum tensor networks: from spin glasses
Where: Jagiellonian University in Krakow, Poland How long: 36...