High-intensity terahertz radiation from a microstructured large-area photoconductor A Dreyhaupt, S Winnerl, T Dekorsy, M Helm
Applied Physics Letters 86 (12), 121114, 2005
413 2005 Room temperature ferromagnetism in ZnO films due to defects Q Xu, H Schmidt, S Zhou, K Potzger, M Helm, H Hochmuth, M Lorenz, ...
Applied Physics Letters 92 (8), 082508, 2008
401 2008 Intersubband emission from semiconductor superlattices excited by sequential resonant tunneling M Helm, P England, E Colas, F DeRosa, SJ Allen Jr
Physical review letters 63 (1), 74, 1989
327 1989 Carrier relaxation in epitaxial graphene photoexcited near the Dirac point S Winnerl, M Orlita, P Plochocka, P Kossacki, M Potemski, T Winzer, ...
Physical review letters 107 (23), 237401, 2011
316 2011 Long lifetimes of quantum-dot intersublevel transitions in the terahertz range EA Zibik, T Grange, BA Carpenter, NE Porter, R Ferreira, G Bastard, ...
Nature materials 8 (10), 803-807, 2009
227 2009 Room temperature ferromagnetism in carbon-implanted ZnO S Zhou, Q Xu, K Potzger, G Talut, R Grötzschel, J Fassbender, ...
Applied Physics Letters 93 (23), 232507, 2008
223 2008 Crystallographically oriented Co and Ni nanocrystals inside ZnO formed by ion implantation and postannealing S Zhou, K Potzger, J Von Borany, R Grötzschel, W Skorupa, M Helm, ...
Physical Review B 77 (3), 035209, 2008
215 2008 Ultrafast graphene-based broadband THz detector M Mittendorff, S Winnerl, J Kamann, J Eroms, D Weiss, H Schneider, ...
Applied Physics Letters 103 (2), 021113, 2013
205 2013 Origin of magnetic moments in defective TiO 2 single crystals S Zhou, E Čižmár, K Potzger, M Krause, G Talut, M Helm, J Fassbender, ...
Physical Review B 79 (11), 113201, 2009
205 2009 Impulsive terahertz radiation with high electric fields from an amplifier-driven large-area photoconductive antenna M Beck, H Schäfer, G Klatt, J Demsar, S Winnerl, M Helm, T Dekorsy
Optics Express 18 (9), 9251-9257, 2010
195 2010 Direct observation of the LO phonon bottleneck in wide GaAs/ BN Murdin, W Heiss, C Langerak, SC Lee, I Galbraith, G Strasser, ...
Physical Review B 55 (8), 5171, 1997
162 1997 The basic physics of intersubband transitions M Helm
Semiconductors and semimetals 62, 1-99, 1999
151 1999 Observation of the intraexciton Autler-Townes effect in GaAs/AlGaAs semiconductor quantum wells M Wagner, H Schneider, D Stehr, S Winnerl, AM Andrews, S Schartner, ...
Physical review letters 105 (16), 167401, 2010
144 2010 Structural and magnetic properties of Mn-implanted Si S Zhou, K Potzger, G Zhang, A Mücklich, F Eichhorn, N Schell, ...
Physical Review B 75 (8), 085203, 2007
144 2007 Thermally Assisted All‐Optical Helicity Dependent Magnetic Switching in Amorphous Fe100–x Tbx A Hassdenteufel, B Hebler, C Schubert, A Liebig, M Teich, M Helm, ...
Advanced Materials 25 (22), 3122-3128, 2013
142 2013 Infrared spectroscopy and transport of electrons in semiconductor superlattices M Helm
Semiconductor science and technology 10 (5), 557, 1995
140 1995 Nonvolatile bipolar resistive switching in Au/BiFeO3 /Pt Y Shuai, S Zhou, D Bürger, M Helm, H Schmidt
Journal of Applied Physics 109 (12), 124117, 2011
138 2011 High-field high-repetition-rate sources for the coherent THz control of matter B Green, S Kovalev, V Asgekar, G Geloni, U Lehnert, T Golz, M Kuntzsch, ...
Scientific reports 6 (1), 1-9, 2016
135 2016 Fe implanted ferromagnetic ZnO K Potzger, S Zhou, H Reuther, A Mücklich, F Eichhorn, N Schell, ...
Applied physics letters 88 (5), 052508, 2006
135 2006 Spectroscopic THz near-field microscope HG Von Ribbeck, M Brehm, DW Van der Weide, S Winnerl, O Drachenko, ...
Optics Express 16 (5), 3430-3438, 2008
127 2008 