947 citations · 1.1k across the 21 of their papers we have counts for
23 papers
Observation of the orbital Nernst effect
Yuto Masuda, Takamasa Hirai, Daegeun Jo +5
The Nernst effect, which converts a temperature gradient into a transverse charge current, is fundamental to thermoelectrics. Its spin analogue, the spin Nernst effect, enables the…
Interplay of nonrelativistic and relativistic spin splittings in altermagnets
Daegeun Jo, Peter M. Oppeneer, Mohsen Yarmohammadi
Despite their compensated magnetic moments, altermagnets (AMs) exhibit nonrelativistic spin splitting (NRSS) that offers routes to spintronic functionality without relying on relat…
Spin-Orbital Hall Nano-Oscillators using PtCr/NiFe
Utkarsh Shashank, Akash Kumar, Daegeun Jo +11
The orbital Hall effect provides a promising route for generating angular-momentum currents beyond conventional spin Hall physics. PtCr alloys exhibit unusually large current-induc…
Giant perpendicular Edelstein polarization in 2D compensated magnets via bichromatic Floquet driving
Mohsen Yarmohammadi, Daegeun Jo, Marco Berritta +3
While unconventional -wave magnets can generate nonrelativistic Edelstein polarizations, spin-group symmetries strictly forbid these responses in unconventional magnets with hig…
Theoretical study of orbital torque: Dependence on ferromagnet species and nonmagnetic layer thickness
Daegeun Jo, Peter M. Oppeneer
The manipulation of magnetization in ferromagnetic metals (FMs) through orbital torque (OT) has emerged as a promising route for energy-efficient magnetic devices without relying o…
Spin polarization engineering in -wave altermagnets
Mohsen Yarmohammadi, Marco Berritta, Marin Bukov +3
Altermagnets host unconventional spin-polarized bands despite zero net magnetization, but controlling their spin structure remains challenging. We propose a multi-field approach to…
Itinerant Orbital Hall Effect Mechanism Leading to Large Negative Orbital Torques from Light Metal Vanadium
Nikhil Vijayan, Durgesh Kumar, Ao Du +13
The orbital Hall effect (OHE) has attracted significant attention for developing energy-efficient electronic devices. However, utilizing it in fast, low-power devices requires an e…
Anomalous spin dynamics after dual optical excitation
Sergii Parchenko, Peter M. Oppeneer, Andreas Scherz
Ultrashort optical pulses are a cornerstone for manipulating electronic and magnetic states in materials on a femtosecond timescale. Conventional models assume that optical excitat…
Unconventional orbital currents and torques due to ferro-rotational orbital textures
Daegeun Jo, Peter M. Oppeneer
Orbital angular momentum transport has emerged as a promising route for manipulating magnetic devices, yet its generation has largely relied on the conventional orbital Hall effect…
Light-induced Orbital and Spin Magnetism in , , and Transition Metals
Theodoros Adamantopoulos, Dongwook Go, Peter M. Oppeneer +1
Understanding the coherent interplay of light with the magnetization in metals has been a long-standing problem in ultrafast magnetism. While it is known that when laser light acts…
Ultrafast photoinduced phase transition in the antiferromagnetic Dirac semimetal EuAgAs
Hao Liu, Chen Zhang, Qi-Yi Wu +12
We report the observation of a light-induced subpicosecond phase transition in the antiferromagnetic Dirac semimetal EuAgAs, achieved through ultrafast optical excitation. Using ul…
Weak Ferromagnetism in Altermagnets from Alternating -Tensor Anisotropy
Daegeun Jo, Dongwook Go, Yuriy Mokrousov +3
Altermagnets are magnetic materials with antiferromagnetic spin ordering but exhibit ferromagnetic properties. Understanding the microscopic origin of the latter is a central probl…
Harnessing magnetic octupole Hall effect to induce torque in altermagnets
Seungyun Han, Daegeun Jo, Insu Baek +2
d-wave altermagnets have magnetic octupoles as their order parameters [Phys. Rev. X 14, 011019 (2024)]. We theoretically show that magnetic octupoles injected from outside generate…
Unveiling the 5 electron hybridization process in UPdAl via ARPES and Time-resolved PES
Jiao-Jiao Song, Qi-Yi Wu, Chen Zhang +15
This study investigates the 5-electron-conduction electron hybridization process in the heavy fermion superconductor UPdAl using a combination of angle-resolved photoemi…
Doping dependence and multichannel mediators of superconductivity: Calculations for a cuprate model
Fabian Schrodi, Alex Aperis, Peter M. Oppeneer
We study two aspects of the superconductivity in a cuprate model system, its doping dependence and the influence of competing pairing mediators. We first include electron-phonon in…
Demagnetization dynamics after noncollinear dual optical excitation
Sergii Parchenko, Matthias Riepp, Simon Marotzke +4
We explore the impact of optical excitation using two interfering ultrashort optical pulses on ultrafast magnetization dynamics. Our investigation focuses on Pt/Co/Pt multilayers a…
Direct observation of nanometer-scale orbital angular momentum accumulation
Juan Carlos Idrobo, Ján Rusz, Gopal Datt +6
Conversion of charge to orbital angular momentum through the orbital Hall effect (OHE) holds transformative potential for the development of orbital-based electronics, however, it…
Relocalization of Uranium 5f Electrons in Antiferromagnetic Heavy Fermion Superconductor UPdAl: Insights from Angle-Resolved Photoemission Spectroscopy
Jiao-Jiao Song, Chen Zhang, Qi-Yi Wu +15
We investigate the antiferromagnetic heavy fermion superconductor UPdAl, employing angle-resolved photoemission spectroscopy to unravel the complex electronic structure of…
Optical control of 4f orbital state in rare-earth metals
N. Thielemann-Kühn, T. Amrhein, W. Bronsch +28
A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare…
Evolution of multi-gap superconductivity in the atomically thin limit: Strain-enhanced three-gap superconductivity in monolayer MgB
J. Bekaert, A. Aperis, B. Partoens +2
Starting from first principles, we show the formation and evolution of superconducting gaps in MgB at its ultrathin limit. Atomically thin MgB is distinctly different from…
Beyond a phenomenological description of magnetostriction
A. H. Reid, X. Shen, P. Maldonado +28
We use ultrafast x-ray and electron diffraction to disentangle spin-lattice coupling of granular FePt in the time domain. The reduced dimensionality of single-crystalline FePt nano…
Efficient metallic spintronic emitters of ultrabroadband terahertz radiation
T. Seifert, S. Jaiswal, U. Martens +18
Terahertz electromagnetic radiation is extremely useful for numerous applications such as imaging and spectroscopy. Therefore, it is highly desirable to have an efficient table-top…
Quadratic X-ray magneto-optical effect in reflection at the M-edges of 3d transition metals
S. Valencia, A. Kleibert, A. Gaupp +5
We have observed a quadratic x-ray magneto-optical effect in near-normal incidence reflection at the M-edges of iron. The effect appears as the magnetically induced rotation of ca.…