2016

Photoluminescence from ultrathin Ge-rich multiple quantum wells observed up to room temperature: Experiments and modeling
T. Wendav, I.A. Fischer, M. Virgilio, G. Capellini, F. Oliveira, M.F. Cerqueira, A. Benedetti, S. Chiussi, P. Zaumseil, B. Schwartz, K. Busch, and J. Schulze (2016)
Physical Review B 94:245304
Employing a low-temperature growth mode, we fabricated ultrathin Si1−x Gex /Si multiple quantum well structures with a well thickness of less than 1.5 nm and a Ge concentration above 60% directly on...
Non-Markovianity in atom-surface dispersion forces
F. Intravaia, R. O. Behunin, C. Henkel, K. Busch, and D. A. R. Dalvit (2016)
Physical Review A 94:042114
We discuss the failure of the Markov approximation in the description of atom-surface fluctuation-induced interactions, both in equilibrium (Casimir-Polder forces) and out of equilibrium (quantum...
Failure of Local Thermal Equilibrium in Quantum Friction
F. Intravaia, R. O. Behunin, C. Henkel, K. Busch, and D. A. R. Dalvit (2016)
Physical Review Letters 117:100402

Recent progress in manipulating atomic and condensed matter systems has instigated a surge of interest in nonequilibrium physics, including many-body dynamics of trapped ultracold atoms and ions,...

Dimensional transformation of defect-induced noise, dissipation, and nonlinearity
R. O. Behunin, F. Intravaia, and P. T. Rakich (2016)
Physical Review B 93:224110
In recent years, material-induced noise arising from defects has emerged as an impediment to quantum-limited measurement in systems ranging from microwave qubits to gravity wave interferometers. As...
Nonequilibrium Casimir-Polder plasmonic interactions
N. Bartolo, R. Messina, D. A. R. Dalvit, and F. Intravaia (2016)
Physical Review A 93:042111
We investigate how the combination of nonequilibrium effects and material properties impacts on the Casimir-Polder interaction between an atom and a surface. By addressing systems with temperature...
Surface-plasmon-polariton hybridized cavity modes in submicrometer slits in a thin Au film
Walther, R, Fritz, S, Müller, E, Schneider, T, Maniv, T, Cohen, H, Matyssek, C, Busch, K, and Gerthsen, D (2016)
Physical Review B 93:245417
The excitation of cavity standing waves in double-slit structures in thin gold films, with slit lengths between 400 and 2560 nm, was probed with a strongly focused electron beam in a transmission...
Compositonal dependence of the band-gap of Ge(1-x-y) Si(x) Sn(y) alloys
Wendav, T, Fischer, IA, Montanari, M, Zoellner, MH, Klesse, W, Capellini, G, von_den_Driesch, N, Oehme, M, Buca, D, Busch, K, and Schulze, J (2016)
Applied Physics Letters 108:242104
The group-IV semiconductor alloy Ge(1−x−y) Si(x) Sn(y) has recently attracted great interest due to its prospective potential for use in optoelectronics, electronics, and photovoltaics. Here, we...
Structure-induced resonant tail-state regime absorption in polymer: fullerene bulk-heterojunction solar cells
Pfadler, T, Kiel, T, Stärk, M, Werra, JFM, Matyssek, C, Sommer, D, Boneberg, J, Busch, K, Weickert, J, and Schmidt-Mende, L (2016)
Physical Review B 93:205305
On this work, we present resonant tail-state regime absorption enhanced organic photovoltaics. We combine periodically structured TiO2 bottom electrodes with P3HT-PCBM bulk-heterojunction solar cells...
Coupling of Surface-Plasmon-Polariton-Hybridized Cavity Modes between Submicron Slits in a Thin Gold Film
Walther, R, Fritz, S, Müller, E, Schneider, R, Gerthsen, D, Sigle, W, Maniv, T, Cohen, H, Matyssek, C, and Busch, K (2016)
ACS Photonics 3:836
Electron energy loss spectroscopy (EELS) in a monochromated transmission electron microscope is applied to probe standing-wave-like cavity modes hybridized with surface plasmon polaritons (SPP) in...
Ultrafast three-wave-mixing in plasmonic nanostructures
D. Huynh, M. Moeferdt, C. Matyssek, C. Wolff, and K. Busch (2016)
Applied Physics B 122:139

We present a perturbative approach to the time-domain computation of three-wave-mixing signals from plasmonic nanostructures. Based on a hydrodynamic material model which features nonlinear as...

Determining graphene's induced band gap with magnetic and electric emitters
Werra, JFM, Krüger, P, Busch, K, and Intravaia, F (2016)
Physical Review B 93:081404(R)
We present numerical and analytical results for the lifetime of emitters in close proximity to graphene sheets. Specifically, we analyze the contributions from different physical channels that...
TE resonances in graphene-dielectric structures
Werra, JFM, Intravaia, F, and Busch, K (2016)
Journal of Optics 18:034001
We investigate the dispersion relations of TE resonances in different graphene-dielectric structures. Previous work has shown that when a graphene layer is brought into contact with a dielectric...
Second Harmonic Generation from Metal Nano-Particle Resonators: Numerical Analysis On the Basis of the Hydrodynamic Drude Model
Hille, A, Moeferdt, M, Wolff, C, Matyssek, C, Rodriguez-Oliveros, R, Prohm, C, Niegemann, J, Grafström, S, Eng, LM, and Busch, K (2016)
Journal of Physical Chemistry C 120:1163
A detailed computational study of the wavelength-dependent efficiency of optical second-harmonic generation in plasmonic nanostructures is presented. The computations are based on a discontinuous...
Green's-function formalism for waveguide QED applications
Schneider, MP, Sproll, T, Stawiarski, C, Schmitteckert, P, and Busch,K (2016)
Physical Review A 93:013828
We present a quantum-field-theoretical framework based on path integrals and Feynman diagrams for the investigation of the quantum-optical properties of one-dimensional waveguiding structures with...

2015

Growth and characterization of SiGeSn quantum well photodiodes
Fischer, I, Wendav, T, Augel, L, Jitpakdeebodin, S, Oliveira, F, Benedetti, A, Stefanov, S, Chiussi, S, Capellini, G, Busch, K, and Schulze, J (2015)
Optics Express 23:25048
We report on the fabrication and electro-optical characterization of SiGeSn multi-quantum well PIN diodes. Two types of PIN diodes, in which two and four quantum wells with well and barrier...
Real-space imaging of nanotip plasmons using electron energy loss spectroscopy
Schröder, B, Weber, T, Yalunin, SV, Kiel, T, Matyssek, C, Sivis, M, Schäfer, S, vonCube, F, Irsen, S, Busch, K, Ropers, C, and Linden, S (2015)
Physical Review B 92:085411
We report the spatial mapping of surface plasmons on conical gold nanotips by electron energy loss spectroscopy. We observe standing-wave patterns resulting from reflections of the fundamental...
Electroluminescence of GeSn/Ge MQW LEDs on Si substrate
Bernhard Schwartz, Michael Oehme, Konrad Kostecki, Daniel Widmann, Martin Gollhofer, Roman Koerner, Stefan Bechler, Inga A. Fischer, Torsten Wendav, Erich Kasper, Jörg Schulze, and Martin Kittler (2015)
Optics Letters 40:3209
Multi-quantum well light-emitting diodes, consisting of ten alternating GeSn/Ge-layers, were grown by molecular beam epitaxy on Si. The Ge barriers were 10 nm thick, and the GeSn wells were grown...
Fluorescence in nonlocal dissipative periodic structures
Intravaia, F and Busch, K (2015)
Physical Review A 91:053836
We present an approach for the description of fluorescence from optically active materials embedded in layered periodic structures. Based on an exact electromagnetic Green's tensor analysis, we...
Friction forces on atoms after acceleration
Intravaia, F, Mkrtchian, VE, Buhmann, SY, Scheel, S, Dalvit, DAR, and Henkel, C (2015)
Journal of Physics: Condensed Matter 27:214020
The aim of this paper is to revisit the calculation of atom–surface quantum friction in the quantum field theory formulation put forward by Barton (2010 New J. Phys. 12 113045). We show that the...
Current sheets in the Discontinuous Galerkin Time-Domain method: an application to graphene
J FM Werra, C Wolff, C Matyssek, and K Busch (2015)
Proceedings of SPIE 9502, Metamaterials X, 95020E
We describe the treatment of thin conductive sheets within the Discontinuous Galerkin Time-Domain (DGTD) method for solving the Maxwell equations and apply this approach to the efficient computation...

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