Femtosecond phononic coupling to both spins and charges in a room-temperature antiferromagnetic semiconductor

Bossini, Davide; Conte, Stefano Dal; Terschanski, Marc; Springholz, G.; Bonanni, A.; Deltenre, Kira; Anders, Frithjof B.; Uhrig, Götz S.; Cerullo, Giulio; Cinchetti, Mirko

doi:10.1103/physrevb.104.224424

Cited by 17 publications

(22 citation statements)

References 41 publications

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“…The interaction between femtosecond laser pulses and MnTe is expected to induce coherently Raman active phonons, either via the impulsive stimulated Raman scattering [31] or displacive excitation of coherent phonons mechanism [32]. In particular, the 5.3 THz modes aforementioned are optical phonons and they modify the exchange coupling, as they correspond to Te-atoms oscillations [23]. We consider the resonant excitation of a particular phonon at frequency ω.…”

Section: A Modelmentioning

confidence: 99%

“…On the basis of experimental findings for α-MnTe [23], we assume that the relaxation rate γ r is significantly smaller than the damping rate γ of the driving term. Consequently, the effect of the decay of the magnon oc-cupation happens on time scales much longer than the duration of the driving pulse.…”

Section: Constantmentioning

confidence: 99%

“…A very recent time-resolved experiment [23] displays photo-induced coherent oscillations of the rotation of the polarisation of light well pronounced in the antiferromagnetic phase of α-MnTe. In this experiment, femtosecond laser pulses trigger the 5.3 THz modes by means of a Raman-scattering mechanism changing the interatomic potentials for fractions of a picosecond.…”

Section: Introductionmentioning

confidence: 99%

“…The question arises how light couples to the magnetic subsystem and coherently drives a magnetization modulation in the class of antiferromagnetically ordered insulators (or semiconductors) [23]. Based on the seminal work by Fleury and Loudon [25] and Shastry and Shraiman [26] it is possible that Raman scattering directly excites spin degrees of freedom via the Peierls coupling of the vector potential in the hopping elements of the underlying fermionic Hubbard model.…”

Section: Introductionmentioning

confidence: 99%

“…The material specific details only enter in the modifications of momentum dependent couplings in the differential equations, but they do not change their analytic structure. Using realistic exchange couplings extracted from measured magnon dispersions [29] allows us to make contact to the lattice-driven femtosecond magnon dynamics in α-MnTe [23].…”

Section: Introductionmentioning

confidence: 99%

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Lattice-driven femtosecond magnon dynamics in $α$-MnTe

Deltenre,

Bossini,

Anders

et al. 2021

Preprint

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The light-induced femtosecond dynamics of the sublattice magnetizations in the antiferromagnetically ordered phase of the semiconductor α-MnTe is investigated theoretically as function of an external driving field. The electromagnetic field is coupled to optical modes and the concomitant atomic displacements modulate the Heisenberg exchange couplings. We derive the equations of motion for the time-dependent sublattice magnetization in spin wave theory and analyze the contributions from the driven magnon modes. The antiferromagnetic order parameter exhibits coherent longitudinal oscillations determined by the external driving frequency which decay due to dephasing. Including a phenomenological dissipative term to mimic spin-lattice relaxation processes leads to relaxation back to thermal equilibrium. We provide approximate analytic solutions of the resulting differential equations which allow us to understand the effect of the driving light pulse on the amplitude, frequency, and lifetime of the coherent spin dynamics.

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Section: A Modelmentioning

confidence: 99%

Section: Constantmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lattice-driven femtosecond magnon dynamics in $α$-MnTe

Deltenre,

Bossini,

Anders

et al. 2021

Preprint

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Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism

Baral

Abeykoon

Campbell

et al. 2023

Adv Funct Materials

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A comprehensive x‐ray scattering study of spontaneous magnetostriction in hexagonal MnTe, an antiferromagnetic semiconductor with a Néel temperature of TN = 307 K, is presented. The largest spontaneous magnetovolume effect known for an antiferromagnet is observed, reaching a volume contraction of |ΔV/V| > 7 × 10−3. This can be justified semiquantitatively by considering bulk material properties, the spatial dependence of the superexchange interaction, and the geometrical arrangement of magnetic moments in MnTe. The highly unusual linear scaling of the magnetovolume effect with the short‐range magnetic correlations, beginning in the paramagnetic state well above TN, points to a novel physical mechanism, which is explained in terms of a trilinear coupling of the elastic strain with superposed distinct domains of the antiferromagnetic order parameter. This novel mechanism for coupling lattice strain to robust short‐range magnetic order casts new light on magnetostrictive phenomena and also provides a template by which the exceptional magnetostrictive properties of MnTe might be realized in a wide range of other functional materials.

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Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition

Hajlaoui,

Wilfred D'Souza,

Šmejkal

et al. 2024

Advanced Materials

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Altermagnetic (AM) materials exhibit non‐relativistic, momentum‐dependent spin‐split states, ushering in new opportunities for spin electronic devices. While the characteristics of spin‐splitting are documented within the framework of the non‐relativistic spin group symmetry, there is limited exploration of the inclusion of relativistic symmetry and its impact on the emergence of a novel spin‐splitting in the band structure. This study delves into the intricate relativistic electronic structure of an AM material, α−MnTe. Employing temperature‐dependent angle‐resolved photoelectron spectroscopy across the AM phase transition, we elucidate the emergence of a relativistic valence band splitting concurrent with the establishment of magnetic order. This discovery is validated through disordered local moment calculations, modeling the influence of magnetic order on the electronic structure and confirming the magnetic origin of the observed splitting. The temperature‐dependent splitting is ascribed to the advent of relativistic spin‐splitting resulting from the strengthening of AM order in α−MnTe as the temperature decreases. This sheds light on a previously unexplored facet of this intriguing material.This article is protected by copyright. All rights reserved

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Femtosecond phononic coupling to both spins and charges in a room-temperature antiferromagnetic semiconductor

Cited by 17 publications

References 41 publications

Lattice-driven femtosecond magnon dynamics in $α$-MnTe

Lattice-driven femtosecond magnon dynamics in $α$-MnTe

Giant Spontaneous Magnetostriction in MnTe Driven by a Novel Magnetostructural Coupling Mechanism

Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition

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