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Coherent terahertz control and ultrafast spectroscopy of layered antiferromagnets

Record Type:	Electronic resources : Monograph/item
Title/Author:	Coherent terahertz control and ultrafast spectroscopy of layered antiferromagnetsby Batyr Ilyas.
Author:	Ilyas, Batyr.
Published:	Cham :Springer Nature Switzerland :2025.
Description:	xx, 165 p. :ill. (chiefly col.), digital ;24 cm.
Notes:	"Doctoral thesis accepted by Massachusetts Institute of Technology, USA."
Contained By:	Springer Nature eBook
Subject:	Antiferromagnetism.
Online resource:	https://doi.org/10.1007/978-3-032-00082-8
ISBN:	9783032000828$q(electronic bk.)

Coherent terahertz control and ultrafast spectroscopy of layered antiferromagnets
Ilyas, Batyr.

Coherent terahertz control and ultrafast spectroscopy of layered antiferromagnets[electronic resource] /by Batyr Ilyas. - Cham :Springer Nature Switzerland :2025. - xx, 165 p. :ill. (chiefly col.), digital ;24 cm. - Springer theses,2190-5061. - Springer theses..

"Doctoral thesis accepted by Massachusetts Institute of Technology, USA."

Introduction -- Ultrafast phenomena in quantum materials -- Layered magnets A highly tunable platform of magnetism -- THz field induced metastable magnetization near criticality in FePS35 Time of flight detection of terahertz phonon polariton -- Coherent detection of hidden magnetostriction effect -- Magnetically brightened dark electron-phonon bound states -- Discovery of monolayer van der Waals multiferroic.

This thesis presents new insights into the strong interactions among electronic, lattice, spin, and orbital degrees of freedom in layered magnetic materials, as well as their emergent properties. Using a suite of spectroscopic techniques, both in equilibrium and out-of-equilibrium settings, several important findings have been made. In a family of transition metal thiophosphates, a novel bound state resulting from electronic transitions between d-orbitals and Raman-active phonons was observed in NiPS3, using femtosecond transient absorption spectroscopy. Furthermore, this phonon symmetry was employed to identify a new magnetostrictive effect in FePS3 through coherent phonon spectroscopy. These and other observations point to strong interactions between spin and lattice degrees of freedom in this system. This coupling has been harnessed to actively control the magnetic structure. Specifically, intense, tailored terahertz pulses were used to displace the lattice along particular phonon directions, inducing a new magnetic order characterized by net magnetization. This effect is notably more efficient and exhibits an increasingly longer lifetime near the phase transition point, highlighting the key role played by critical fluctuations. Finally, second harmonic generation, linear dichroism, and Raman spectroscopy were employed to discover a new type-II multiferroic phase that persists down to the atomic monolayer limit in NiI2.

ISBN: 9783032000828$q(electronic bk.)

Standard No.: 10.1007/978-3-032-00082-8doiSubjects--Topical Terms:

229787
Antiferromagnetism.

LC Class. No.: QC761.5

Dewey Class. No.: 538.44

Coherent terahertz control and ultrafast spectroscopy of layered antiferromagnets
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505 0 $a Introduction -- Ultrafast phenomena in quantum materials -- Layered magnets A highly tunable platform of magnetism -- THz field induced metastable magnetization near criticality in FePS35 Time of flight detection of terahertz phonon polariton -- Coherent detection of hidden magnetostriction effect -- Magnetically brightened dark electron-phonon bound states -- Discovery of monolayer van der Waals multiferroic.
520 $a This thesis presents new insights into the strong interactions among electronic, lattice, spin, and orbital degrees of freedom in layered magnetic materials, as well as their emergent properties. Using a suite of spectroscopic techniques, both in equilibrium and out-of-equilibrium settings, several important findings have been made. In a family of transition metal thiophosphates, a novel bound state resulting from electronic transitions between d-orbitals and Raman-active phonons was observed in NiPS3, using femtosecond transient absorption spectroscopy. Furthermore, this phonon symmetry was employed to identify a new magnetostrictive effect in FePS3 through coherent phonon spectroscopy. These and other observations point to strong interactions between spin and lattice degrees of freedom in this system. This coupling has been harnessed to actively control the magnetic structure. Specifically, intense, tailored terahertz pulses were used to displace the lattice along particular phonon directions, inducing a new magnetic order characterized by net magnetization. This effect is notably more efficient and exhibits an increasingly longer lifetime near the phase transition point, highlighting the key role played by critical fluctuations. Finally, second harmonic generation, linear dichroism, and Raman spectroscopy were employed to discover a new type-II multiferroic phase that persists down to the atomic monolayer limit in NiI2.
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