Manfred Helm

Overview

Best Publications

• High-intensity terahertz radiation from a microstructured large-area photoconductor

  Andre Dreyhaupt;Stephan Winnerl;Thomas Dekorsy;Manfred Helm

  450
  Citations

• Room temperature ferromagnetism in ZnO films due to defects

  Qingyu Xu;Heidemarie Schmidt;Shengqiang Zhou;Kay Potzger

  424
  Citations

• Carrier Relaxation in Epitaxial Graphene Photoexcited Near the Dirac Point

  S. Winnerl;M. Orlita;M. Orlita;P. Plochocka;P. Kossacki

  365
  Citations

• Intersubband emission from semiconductor superlattices excited by sequential resonant tunneling

  M. Helm;P. England;E. Colas;F. DeRosa

  332
  Citations

• Long lifetimes of quantum-dot intersublevel transitions in the terahertz range

  E. A. Zibik;E. A. Zibik;Thomas Grange;Thomas Grange;B. A. Carpenter;N. E. Porter

  252
  Citations

• Ultrafast graphene-based broadband THz detector

  Martin Mittendorff;Stephan Winnerl;Josef Kamann;Jonathan Eroms

  244
  Citations

• Origin of magnetic moments in defective TiO 2 single crystals

  Shengqiang Zhou (周生强);E. Čižmár;K. Potzger;M. Krause

  230
  Citations

• Room temperature ferromagnetism in carbon-implanted ZnO

  Shengqiang Zhou;Qingyu Xu;Kay Potzger;Georg Talut

  228
  Citations

• Crystallographically oriented Co and Ni nanocrystals inside ZnO formed by ion implantation and postannealing

  Shengqiang Zhou;K. Potzger;J. von Borany;R. Grötzschel

  227
  Citations

• Room temperature ferromagnetism in carbon-implanted ZnO

  Shengqiang Zhou;Qingyu Xu;Kay Potzger;Georg Talut

  225
  Citations

• Impulsive terahertz radiation with high electric fields from an amplifier-driven large-area photoconductive antenna.

  Matthias Beck;Hanjo Schäfer;Gregor Klatt;Jure Demsar

  221
  Citations

• High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter

  B. Green;S. Kovalev;V. Asgekar;G. Geloni

  186
  Citations

• Thermally assisted all-optical helicity dependent magnetic switching in amorphous Fe(100-x)Tb(x) alloy films.

  Alexander Hassdenteufel;Birgit Hebler;Christian Schubert;Andreas Liebig

  178
  Citations

• Demonstration of a Broadband Photodetector Based on a Two-Dimensional Metal-Organic Framework.

  Himani Arora;Himani Arora;Renhao Dong;Tommaso Venanzi;Tommaso Venanzi;Jens Zscharschuch

  171
  Citations

• Observation of the intraexciton Autler-Townes effect in GaAs/AlGaAs semiconductor quantum wells

  Martin Wagner;Harald Schneider;Dominik Stehr;Stephan Winnerl

  167
  Citations

• Spectroscopic THz near-field microscope.

  H. G. von Ribbeck;M. Brehm;D. W. van der Weide;S. Winnerl

  166
  Citations

• Fe implanted ferromagnetic ZnO

  K. Potzger;Shengqiang Zhou;H. Reuther;A. Muecklich

  161
  Citations

• Bright green electroluminescence from Tb3+ in silicon metal-oxide-semiconductor devices

  Jiaming Sun;Wolfgang Skorupa;Thomas Dekorsy;Manfred Helm

  159
  Citations

• Structural and magnetic properties of Mn-implanted Si

  Shengqiang Zhou;K. Potzger;Gufei Zhang;A. Mücklich

  158
  Citations

• Direct observation of the LO phonon bottleneck in wide GaAs/AlxGa1-xAs quantum wells

  Ben Murdin;W Heiss;C J G M Langerak;S C Lee

  155
  Citations

• Nonvolatile bipolar resistive switching in Au/BiFeO3/Pt

  Yao Shuai;Shengqiang Zhou;Danilo Bürger;Manfred Helm

  152
  Citations