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
382 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
378 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
315 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
283 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
218 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
216 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
205 2008 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
188 2009 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
175 2013 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
172 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
153 1997 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
143 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
140 2007 Three New Low-Energy Resonances in the F Cavanna, R Depalo, M Aliotta, M Anders, D Bemmerer, A Best, ...
Physical review letters 115 (25), 252501, 2015
134 * 2015 Infrared spectroscopy and transport of electrons in semiconductor superlattices M Helm
Semiconductor science and technology 10 (5), 557, 1995
133 1995 The basic physics of intersubband transitions M Helm
Semiconductors and semimetals 62, 1-99, 1999
132 1999 Fe implanted ferromagnetic ZnO K Potzger, S Zhou, H Reuther, A Mücklich, F Eichhorn, N Schell, ...
Applied physics letters 88 (5), 052508, 2006
131 2006 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
127 2011 Observation of grating‐induced intersubband emission from GaAs/AlGaAs superlattices M Helm, E Colas, P England, F DeRosa, SJ Allen Jr
Applied physics letters 53 (18), 1714-1716, 1988
123 1988 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
122 2013 