Manfred Helm
Manfred Helm
Institute Director at Helmholtz-Zentrum Dresden-Rossendorf, and Professor of Physics, TU Dresden
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Dikutip oleh
Dikutip oleh
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
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
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
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
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
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
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
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
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
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
Direct observation of the LO phonon bottleneck in wide GaAs/ As quantum wells
BN Murdin, W Heiss, C Langerak, SC Lee, I Galbraith, G Strasser, ...
Physical Review B 55 (8), 5171, 1997
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
The basic physics of intersubband transitions
M Helm
Semiconductors and semimetals 62, 1-99, 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
Fe implanted ferromagnetic ZnO
K Potzger, S Zhou, H Reuther, A Mücklich, F Eichhorn, N Schell, ...
Applied physics letters 88 (5), 052508, 2006
Infrared spectroscopy and transport of electrons in semiconductor superlattices
M Helm
Semiconductor science and technology 10 (5), 557, 1995
Hole energy levels and intersubband absorption in modulation-doped Si/Si 1− x Ge x multiple quantum wells
T Fromherz, E Koppensteiner, M Helm, G Bauer, JF Nützel, G Abstreiter
Physical Review B 50 (20), 15073, 1994
Far-infrared spectroscopy of minibands and confined donors in GaAs/Al x Ga 1− x As superlattices
M Helm, FM Peeters, F DeRosa, E Colas, JP Harbison, LT Florez
Physical Review B 43 (17), 13983, 1991
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
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
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