283 citations · 1.5k across the 44 of their papers we have counts for
47 papers
Electrically tunable layer-hybridized trions in doped WSe bilayers
Raul Perea-Causin, Samuel Brem, Fabian Buchner +6
Doped van der Waals heterostructures host layer-hybridized trions, i.e. charged excitons with layer-delocalized constituents holding promise for highly controllable optoelectronics…
Three-photon electron spin resonances
S. I. Atwood, V. V. Mkhitaryan, S. Dhileepkumar +5
We report the observation of a three-photon resonant transition of charge-carrier spins in an organic light-emitting diode using electrically detected magnetic resonance (EDMR) spe…
Non-Bloch-Siegert-type power-induced shift of two-photon electron paramagnetic resonances of charge-carrier spin states in an OLED
S. I. Atwood, S. Hosseinzadeh, V. V. Mkhitaryan +7
We present Floquet theory-based predictions and electrically detected magnetic resonance (EDMR) experiments scrutinizing the nature of two-photon magnetic resonance shifts of charg…
Crossover from non-thermal to thermal photoluminescence from metals excited by ultrashort light pulses
Y. Sivan, I. W. Un, I. Kalyan +3
Photoluminescence from metal nanostructures following intense ultrashort illumination is a fundamental aspect of light-matter interactions. Surprisingly, many of its basic characte…
Spin relaxation dynamics of radical-pair processes at low magnetic fields
T. H. Tennahewa, S. Hosseinzadeh, S. I. Atwood +4
We report measurements of room-temperature spin-relaxation times and of charge-carrier spins in a -conjugated polymer thin film under bipolar injection and low ($1\m…
Robust excitons across the phase transition of two-dimensional hybrid perovskites
Jonas D. Ziegler, Kai-Qiang Lin, Barbara Meisinger +11
Two-dimensional halide perovskites are among intensely studied materials platforms profiting from solution based growth and chemical flexibility. They feature exceptionally strong…
Supercurrent diode effect and magnetochiral anisotropy in few-layer NbSe
Lorenz Bauriedl, Christian Bäuml, Lorenz Fuchs +9
Nonreciprocal transport refers to charge transfer processes that are sensitive to the bias polarity. Until recently, nonreciprocal transport was studied only in dissipative systems…
Twist-angle engineering of excitonic quantum interference and optical nonlinearities in stacked 2D semiconductors
Kai-Qiang Lin, Paulo E. Faria Junior, Jonas M. Bauer +6
Twist-engineering of the electronic structure of van-der-Waals layered materials relies predominantly on band hybridization between layers. Band-edge states in transition-metal-dic…
Large-scale mapping of moiré superlattices by Raman imaging of interlayer breathing mode and moiré phonons
Kai-Qiang Lin, Johannes Holler, Jonas M. Bauer +6
Moiré superlattices can induce correlated-electronic phases in twisted van-der-Waals materials. Strongly correlated quantum phenomena emerge, such as superconductivity and the Mott…
Complete polarization of electronic spins in OLEDs
Tobias Scharff, Wolfram Ratzke, Jonas Zipfel +3
At low temperatures and high magnetic fields, electron and hole spins in an organic light-emitting diode (OLED) become polarized so that recombination preferentially forms molecula…
Floquet spin states in OLEDs
S. Jamali, V. V. Mkhitaryan, H. Malissa +11
Weakly spin-orbit coupled electron and hole spins in organic light-emitting diodes (OLEDs) constitute near-perfect two-level systems to explore the interaction of light and matter…
Picosecond time-resolved antibunching measures nanoscale exciton motion, annihilation, and true number of chromophores
Gordon J. Hedley, Tim Schröder, Florian Steiner +8
The particle-like nature of light becomes evident in the photon statistics of fluorescence of single quantum systems as photon antibunching. In multichromophoric systems, exciton d…
Bright excitons with negative-mass electrons
Kai-Qiang Lin, Chin Shen Ong, Sebastian Bange +15
Bound electron-hole excitonic states are generally not expected to form with charges of negative effective mass. We identify such excitons in a single layer of the semiconductor WS…
Hybridized intervalley moiré excitons and flat bands in twisted WSe bilayers
Samuel Brem, Kai-Qiang Lin, Roland Gillen +4
The large surface-to-volume ratio in atomically thin 2D materials allows to efficiently tune their properties through modifications of their environment. Artificial stacking of two…
Ultrafast transition between exciton phases in van der Waals heterostructures
Philipp Merkl, Fabian Mooshammer, Philipp Steinleitner +11
Heterostructures of atomically thin van der Waals bonded monolayers have opened a unique platform to engineer Coulomb correlations, shaping excitonic, Mott insulating, or supercond…
Perdeuteration of poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (d-MEHPPV): control of microscopic charge-carrier spin-spin coupling and of magnetic-field effects in optoelectronic devices
Dani M. Stoltzfus, Gajadhar Joshi, Henna Popli +14
Control of the effective local hyperfine fields in a conjugated polymer, poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV), by isotopic engineering is reported. T…
Two-photon absorption in a two-level system enabled by noise
V. V. Mkhitaryan, C. Boehme, J. M. Lupton +1
We address the textbook problem of dynamics of a spin placed in a dc magnetic field and subjected to an ac drive. If the drive is polarized in the plane perpendicular to the dc fie…
OLEDs as models for bird magnetoception: detecting electron spin resonance in geomagnetic fields
Tobias Grünbaum, Sebastian Milster, Hermann Kraus +6
Certain species of living creatures are known to orientate themselves in the geomagnetic field. Given the small magnitude of approximately 48 μT, the underlying quantum mechanical…
Quantum interference in second-harmonic generation from monolayer WSe2
Kai-Qiang Lin, Sebastian Bange, John M. Lupton
A hallmark of wave-matter duality is the emergence of quantum-interference phenomena when an electronic transition follows different trajectories. Such interference results in asym…
Electric-field quenching of optically detected magnetic resonance in a -conjugated polymer
D. L. Baird, A. Nahlawi, K. Crossley +8
Electric fields are central to the operation of optoelectronic devices based on conjugated polymers since they drive the recombination of electrons and holes to excitons in organic…
High-Field Magnetoresistance of Organic Semiconductors
G. Joshi, M. Y. Teferi, S. Jamali +7
The magneto-electronic field effects in organic semiconductors at high magnetic fields are described by field-dependent mixing between singlet and triplet states of weakly bound ch…
Tuning effective hyperfine fields in PEDOT:PSS thin films by doping
M. Y. Teferi, J. Ogle, G. Joshi +6
Using electrically detected magnetic resonance spectroscopy, we demonstrate that doping the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS)…
Revealing weak spin-orbit coupling effects on charge carriers in a -conjugated polymer
H. Malissa, R. Miller, D. L. Baird +7
We measure electrically detected magnetic resonance (EDMR) on organic light-emitting diodes (OLEDs) made of the polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (M…
Light emission from gold nanoparticles under ultrafast near-infrared excitation: thermal emission, inelastic light scattering or multiphoton luminescence?
Lukas Roloff, Philippe Klemm, Imke Gronwald +3
Gold nanoparticles emit broad-band upconverted luminescence upon irradiation with pulsed infrared laser radiation. Although the phenomenon is widely observed, considerable disagree…