516 citations · 2.8k across the 36 of their papers we have counts for
17 papers · 1 filter
Optically Induced Avoided Crossing in Graphene
Sören Buchenau, Benjamin Grimm-Lebsanft, Florian Biebl +8
Degenerate states in condensed matter are frequently the cause of unwanted fluctuations, which prevent the formation of ordered phases and reduce their functionalities. Removing th…
An ultra-low field SQUID magnetometer for measuring antiferromagnetic and weakly remanent magnetic materials at low temperatures
Michael Paulsen, Julian Lindner, Bastian Klemke +4
A novel setup for the measurement of magnetic fields external to certain antiferromagnets and generally weakly remanent magnetic materials is presented. The setup features a highly…
Anti-symmetric Compton scattering in LiNiPO: Towards a direct probe of the magneto-electric multipole moment
Sayantika Bhowal, Daniel O'Neill, Michael Fechner +4
We present a combined theoretical and experimental investigation of the anti-symmetric Compton profile in LiNiPO as a possible probe for magneto-electric toroidal moments. Unde…
Polarizing an antiferromagnet by optical engineering of the crystal field
Ankit S. Disa, Michael Fechner, Tobia F. Nova +5
Strain engineering is widely used to manipulate the electronic and magnetic properties of complex materials. An attractive route to control magnetism with strain is provided by the…
Observation of a charge-neutral muon-polaron complex in antiferromagnetic CrO
M. H. Dehn, J. K. Shenton, S. Holenstein +13
We report a comprehensive muon spin rotation (SR) study of the prototypical magnetoelectric antiferromagnet CrO. We find the positively charged muon () occupies sev…
Metastable ferroelectricity in optically strained
Tobia Nova, Ankit Disa, Michael Fechner +1
Fluctuating orders in solids are generally considered high-temperature precursors of broken symmetry phases. However, in some cases these fluctuations persist to zero temperature a…
Terahertz-Driven Phonon Upconversion in SrTiO3
Michael Kozina, Michael Fechner, Premysl Marsik +8
Direct manipulation of the atomic lattice using intense long-wavelength laser pulses has become a viable approach to create new states of matter in complex materials. Conventionall…
Ultrafast relaxation dynamics of the antiferrodistortive phase in Ca doped SrTiO3
M. Porer, M. Fechner, E. Bothschafter +19
The ultrafast dynamics of the octahedral rotation in Ca:SrTiO3 is studied by time resolved x-ray diffraction after photo excitation over the band gap. By monitoring the diffraction…
Correlated local dipoles in PbTe
Boris Sangiorgio, Emil S. Bozin, Christos D. Malliakas +6
We present a combined single-crystal x-ray diffuse scattering and ab-initio molecular dynamics study of lead telluride, PbTe. Well-known for its thermoelectric and narrow-gap semic…
Parametric amplification of optical phonons
Andrea Cartella, Tobia Federico Nova, Michael Fechner +2
Amplification of light through stimulated emission or nonlinear optical interactions has had a transformative impact on modern science and technology. The amplification of other bo…
Dynamical Multiferroicity
Dominik Maximilian Juraschek, Michael Fechner, Alexander V. Balatsky +1
An appealing mechanism for inducing multiferroicity in materials is the generation of electric polarization by a spatially varying magnetization that is coupled to the lattice thro…
Ultrafast Structure Switching through Nonlinear Phononics
Dominik Maximilian Juraschek, Michael Fechner, Nicola Ann Spaldin
We describe an ultrafast coherent control of the transient structural distortion arising from nonlinear phononics in ErFeO. Using density functional theory, we calculate the st…
Fermi surface evolution of Na-doped PbTe studied through density functional theory calculations and Shubnikov-de Haas measurements
P. Giraldo-Gallo, B. Sangiorgio, P. Walmsley +5
We present a combined experimental and theoretical study of the evolution of the low-temperature Fermi surface of lead telluride, PbTe, when holes are introduced through sodium sub…
First-principles calculation of the bulk magnetoelectric monopolization: Berry phase and Wannier function approaches
Florian Thöle, Michael Fechner, Nicola A. Spaldin
We present a formalism to calculate the macroscopic magnetoelectric monopolization from first principles within the density functional theory framework. An expression for the monop…
Magnetoelectro-elastic control of magnetism in an artificial multiferroic
J. Heidler, M. Fechner, R. V. Chopdekar +7
We study the coexistence of strain- and charge-mediated magnetoelectric coupling in a cobalt (0-7 nm) wedge on ferroelectric [Pb(Mg/Nb)O]-[PbTiO$_{3}…
The magnetic field generated by a charge in a uniaxial magnetoelectric material
Michael Fechner, Nicola A. Spaldin, I. E. Dzyaloshinskii
We revisit the description of the magnetic field around antiferromagnetic magnetoelectrics in the context of recent developments regarding magnetoelectric monopoles. Using Maxwell'…
Effect of interfacial Cr on magnetoelectricity of Fe2/CrO2/BaTiO3(001)
Martin Hölzer, Michael Fechner, Sergey Ostanin +1
On the basis of first-principles calculations we study the effect of interfacial Cr on the magnetoelectric properties of a composite multiferroic Fe_L/BaTiO_3(001), with the Fe thi…