Magnetic polarons reach a hundred thousand Bohr magnetons

PA Usachev, VN Kats, LA Shelukhin, VV Pavlov… - Materials …, 2025‏ - pubs.rsc.org
The ability of light to manipulate fundamental interactions in a medium is central to research
in optomagnetism and applications in electronics. A prospective approach is to create …

Direct optical probing of ultrafast spin dynamics in a magnetic semiconductor

SCP van Kooten, G Springholz, AB Henriques - Physical Review B, 2022‏ - APS
We uncovered the spin dynamics involved in the birth and growth of giant spin polarons in a
magnetic semiconductor. For this purpose, we developed a measurement technique which …

Photoinduced giant magnetic polarons in EuTe

AB Henriques, AR Naupa, PA Usachev, VV Pavlov… - Physical Review B, 2017‏ - APS
Photoinduced magnetic polarons in EuTe, with a magnetic moment of several hundred Bohr
magnetons, were investigated as a function of pump intensity and temperature by pump …

Ultrafast light switching of ferromagnetism in EuSe

AB Henriques, X Gratens, PA Usachev, VA Chitta… - Physical review …, 2018‏ - APS
We demonstrate that light resonant with the band gap forces the antiferromagnetic
semiconductor EuSe to enter ferromagnetic alignment in the picosecond timescale. A …

Faraday rotation by the undisturbed bulk and by photoinduced giant polarons in EuTe

AB Henriques, PA Usachev - Physical Review B, 2017‏ - APS
A quantum mechanical model is developed for the Faraday effect in europium telluride, for
photons of energy within the transparency gap. The model is based on the well known band …

Modeling huge photoinduced spin polarons in intrinsic magnetic semiconductors

SCP van Kooten, X Gratens, AB Henriques - Physical Review B, 2021‏ - APS
In intrinsic magnetic semiconductors, the absorption of a single photon can generate a spin
polaron, whose magnetic moment reaches many thousands of Bohr magnetons. Here we …

Light-induced polaron magnetization in EuTe at temperatures reaching 150 K

AB Henriques, GD Galgano, PHO Rappl, E Abramof - Physical Review B, 2016‏ - APS
We demonstrate that light creates a highly magnetized region in a magnetic semiconductor
far above its critical temperature. A near-gap photon generates a quasiparticle of nonzero …

Luminescence properties of magnetic polarons in EuTe: Theoretical description and experiments in magnetic fields up to 28 T

AB Henriques, FCD Moraes, GD Galgano, AJ Meaney… - Physical Review B, 2014‏ - APS
The recent discovery of a polaron-associated zero phonon line in the band-edge
photoluminescence of high optical quality EuTe crystals opens up the prospect of answering …

Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides

X Gratens, Y Ou, JS Moodera, PHO Rappl… - Applied Physics …, 2020‏ - pubs.aip.org
We find that in the ferromagnetic semiconductor EuS, near its Curie temperature, a single
band edge photon generates a spin polaron (SP), whose magnetic moment approaches 20 …

Pushing the Boundary of Covalency in Lanthanoid‐Tellurium Bonds: Insights from the Synthesis, Molecular and Electronic Structures of Low‐Coordinate, Monomeric …

R Deka, S Dey, Z Guo, RJ Butcher… - … A European Journal, 2023‏ - Wiley Online Library
Owing to the strict hard/soft dichotomy between the lanthanoids and tellurium atoms, and the
strong affinity of lanthanoid ions for high coordination numbers, low‐coordinate, monomeric …