472 citations · 3.7k across the 97 of their papers we have counts for
23 papers · 1 filter
Magnetic proximity beyond the interface: Layer-sequence-dependent exchange in WSe/CrI heterostructures
Natalie Kuhn, Marc Schütte, Joachim Emming +8
Magnetic proximity effects in transition metal dichalcogenide (TMD)/2D-magnet heterostructures are often described in terms of the magnetization of the interfacial magnetic layer.…
Benchmarking the integration of hexagonal boron nitride crystals and thin films into graphene-based van der Waals heterostructures
Taoufiq Ouaj, Christophe Arnold, Jon Azpeitia +25
We present a benchmarking protocol that combines the characterization of boron nitride (BN) crystals and films with the evaluation of the electronic properties of graphene on these…
Identifying band structure changes of FePS3 across the antiferromagnetic phase transition
Benjamin Pestka, Jeff Strasdas, Gustav Bihlmayer +16
Magnetic 2D materials enable novel tuning options of magnetism. As an example, the van der Waals material FePS3, a zigzag-type intralayer antiferromagnet, exhibits very strong magn…
Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe/MoSe heterobilayers
Frank Volmer, Manfred Ersfeld, Paulo E. Faria Junior +13
We identify an optical excitation mechanism that transfers a valley polarization from photo-excited electron-hole pairs to free charge carriers in twisted WSe/MoSe heterobi…
Putting high-index Cu on the map for high-yield, dry-transferred CVD graphene
Oliver J. Burton, Zachary C. M. Winter, Kenji Watanabe +4
Reliable, clean transfer and interfacing of 2D material layers is technologically as important as their growth. Bringing both together remains a challenge due to the vast, intercon…
Inter-valley dark trion states with spin lifetimes of 150 ns in WSe
F. Volmer, S. Pissinger, M. Ersfeld +3
We demonstrate long trion spin lifetimes in a WSe monolayer of up to 150 ns at 5 K. Applying a transverse magnetic field in time-resolved Kerr-rotation measurements reveals a c…
Identifying suitable substrates for high-quality graphene-based heterostructures
Luca Banszerus, Hendrik Janssen, Martin Otto +6
We report on a scanning confocal Raman spectroscopy study investigating the strain-uniformity and the overall strain and doping of high-quality chemical vapour deposited (CVD) grap…
Growth, characterization, and transport properties of ternary (Bi1-xSbx)2Te3 topological insulator layers
C. Weyrich, M. Drögeler, J. Kampmeier +12
Ternary (Bi1-xSbx)2Te3 films with an Sb content between 0 and 100% were deposited on a Si(111) substrate by means of molecular beam epitaxy. X-ray diffraction measurements confirm…
Unambiguous determination of spin dephasing times in ZnO
Sebastian Kuhlen, Ralph Ledesch, Robin de Winter +7
Time-resolved magneto-optics is a well-established optical pump probe technique to generate and to probe spin coherence in semiconductors. By this method, spin dephasing times T_2^…
Zinc Oxide - From Dilute Magnetic Doping to Spin Transport
Matthias Opel, Sebastian T. B. Goennenwein, Matthias Althammer +9
During the past years there has been renewed interest in the wide-bandgap II-VI semiconductor ZnO, triggered by promising prospects for spintronic applications. First, ferromagneti…
Triggering and probing of phase-coherent spin packets by time-resolved spin transport across an Fe/GaAs Schottky barrier
L. R. Schreiber, C. Schwark, S. Richter +7
Time-resolved electrical spin transport is used to generate and probe spin currents in GaAs electrically. We use high bandwidth current pulses to inject phase-coherent spin packets…
Frequency domain studies of current-induced magnetization dynamics in single magnetic-layer nanopillars
N. Müsgens, S. Fahrendorf, T. Maassen +5
Spin transfer torque-induced high-frequency dynamics of single thin cobalt-layer nanopillars of circular and elliptical shape have been observed directly. Two types of precessional…
Origin of training effect of exchange bias in Co/CoO due to irreversible thermoremanent magnetization of the magnetically diluted antiferromagnet
S. R. Ali, M. R. Ghadimi, M. Fecioru-Morariu +2
The irreversible thermoremanent magnetization of a sole, magnetically diluted epitaxial antiferromagnetic CoO(100) layer is determined by the mean of its thermoremanent mag…
Electric field-driven coherent spin reorientation of optically generated electron spin packets in InGaAs
S. Kuhlen, K. Schmalbuch, M. Hagedorn +5
Full electric-field control of spin orientations is one of the key tasks in semiconductor spintronics. We demonstrate that electric field pulses can be utilized for phase-coherent…
Two-dimensional optical control of electron spin orientation by linearly polarized light in InGaAs
K. Schmalbuch, S. Göbbels, Ph. Schäfers +6
Optical absorption of circularly polarized light is well known to yield an electron spin polarization in direct band gap semiconductors. We demonstrate that electron spins can even…
Mapping of spin lifetimes to electronic states in n-type GaAs near the metal-insulator transition
L. Schreiber, M. Heidkamp, T. Rohleder +2
The longest spin lifetimes in bulk n-GaAs exceed 100 ns for doping concentrations near the metal-insulator transition (J.M. Kikkawa, D.D. Awschalom, Phys. Rev. Lett. 80, 4313 (1998…
Anisotropic Electron Spin Lifetime in (In,Ga)As/GaAs (110) Quantum Wells
L. Schreiber, D. Duda, B. Beschoten +3
Anisotropic electron spin lifetimes in strained undoped (In,Ga)As/GaAs (110) quantum wells of different width and height are investigated by time-resolved Faraday rotation and time…
Dilution dependence of blocking temperature distribution in the exchange bias system CoO(111)/Co(111)
M. R. Ghadimi, M. Fecioru-Morariu, B. Beschoten +1
In epitaxially grown CoO(111)/Co(111) bilayers we have determined the blocking temperature distribution f(Tb), which is correlated with the antiferromagnetic domain size (z) distri…
Asymmetric magnetization reversal in the exchange bias system Fe/FeF_2 studied by MOKE
A. Tillmanns, S. Oertker, B. Beschoten +3
The asymmetry of the magnetization reversal process in exchange biased Fe/FeF has been studied by magneto-optical Kerr effect. Qualitatively different transverse magnetization…
Role of structural defects on exchange bias in the epitaxial CoO/Co system
M. R . Ghadimi, B. Beschoten, G. Güntherodt
We have studied the influence of non-magnetic defects throughout the antiferromagnet Co_{1-y}O on the exchange bias (EB) in epitaxially grown Co_{1-y}O/Co bilayers. These defects a…
Magneto-optical study of magnetization reversal asymmetry in exchange bias
A. Tillmanns, S. Oertker, B. Beschoten +4
The asymmetric magnetization reversal in exchange biased Fe/MnF involves coherent (Stoner-Wohlfarth) magnetization rotation into an intermediate, stable state perpendicular t…
Energy-resolved electron-spin dynamics at surfaces of p-doped GaAs
H. C. Schneider, J. -P. Wuestenberg, O. Andreyev +7
Electron-spin relaxation at different surfaces of p-doped GaAs is investigated by means of spin, time and energy resolved 2-photon photoemission. These results are contrasted with…
GaN:Gd: A superdilute ferromagnetic semiconductor with a Curie temperature above 300 K
S. Dhar, O. Brandt, M. Ramsteiner +2
We investigate the magnetic and magneto-optic properties of epitaxial GaN:Gd layers as a function of the external magnetic field and temperature. An unprecedented magnetic moment i…