Institute of
Ion Beam Physics and Materials Research

Annual Report 2009

Editors:
J. von Borany, V. Heera,
J. Faßbender, M. Helm and W. Möller

Wissenschaftlich-Technische Berichte, FZD-528
March 2010

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The inset graph shows the temperature dependence of the resistance R of a germanium (Ge) substrate (red line) and a heavily gallium (Ga) doped germanium layer (grey-blue line) measured in a four point probe arrangement (schematic as inset, U: voltage, I: current). While the Ge substrate exhibits an exponential increase of the resistance with decreasing temperature as typical for semiconductors, the heavily Ga doped Ge layer behaves "metallic" and becomes superconducting below 0.3 K. The background shows a high-resolution cross-sectional electron microscopy image of the superconducting Ge:Ga layer.

For further information see:
T. Herrmannsdörfer et al., Phys. Rev. Lett. 102, 217 003 (2009), reprinted at pp. 22-25 of this Annual Report.

The complete report (8.5 MB) can be downloaded here, single chapters are available directly from the following list.

Preface
W. Möller, M. Helm, J. Faßbender

Selected Publications

Long lifetimes of quantum-dot intersublevel transitions in the terahertz range
E.A. Zibik, T. Grange, B.A. Carpenter, N.E. Porter, R. Ferreira, G. Bastard, D. Stehr, S. Winnerl, M. Helm, H.Y. Liu, M.S. Skolnick, and L.R. Wilson

Conduction at domain walls in oxide multiferroics
J. Seidel, L.W. Martin, Q. He, Q. Zhan, Y.H. Chu, A. Rother, M.E. Hawkridge, P. Maksymovych, P. Yu, M. Gajek, N. Balke, S.V. Kalinin, S. Gemming, F. Wang, G. Catalan, J.F. Scott, N.A. Spaldin, J. Orenstein, and R. Ramesh

Superconducting state in a gallium-doped germanium layer at low temperatures
T. Herrmannsdörfer, V. Heera, O. Ignatchik, M. Uhlarz, A. Mücklich, M. Posselt, H. Reuther, B. Schmidt, K.-H. Heinig, W. Skorupa, M. Voelskow, C. Wündisch, R. Skrotzki, M. Helm, and J. Wosnitza

Interstitial-mediated diffusion in germanium under proton irradiation
H. Bracht, S. Schneider, J.N. Klug, C.Y. Liao, J.L. Hansen, E.E. Haller, A.N. Larsen, D. Bougeard, M. Posselt, and C. Wündisch

Fano signatures in the intersubband terahertz response of optically excited semiconductor quantum wells
D. Golde, M. Wagner, D. Stehr, H. Schneider, M. Helm, A. M. Andrews, T. Roch, G. Strasser, M. Kira, and S. W. Koch

Transition from smoothing to roughening of ion-eroded GaSb surfaces
A. Keller, A. Biermanns, G. Carbone, J. Grenzer, S. Facsko, O. Plantevin, R. Gago, and T. H. Metzger

Achieving high free electron mobility in ZnO:Al thin films grown by reactive pulsed magnetron sputtering
S. Cornelius, M. Vinnichenko, N. Shevchenko, A. Rogozin, A. Kolitsch, and W. Möller

Highly dense amorphous Nb2O5 films with closed nanosized pores
M. Vinnichenko, A. Rogozin, D. Grambole, F. Munnik, A. Kolitsch, W. Möller, O. Stenzel, S. Wilbrandt, A. Chuvilin, and U. Kaiser

Anomalous Hall resistance in Ge:Mn systems with low Mn concentrations
S. Zhou, D. Bürger, M. Helm, and H. Schmidt

In-situ observation of secondary phase formation in Fe implanted GaN annealed in low pressure N2 atmosphere
G. Talut, J. Grenzer, H. Reuther, A. Shalimov, C. Baehtz, D. Novikov, and B. Walz

Millisecond flash lamp annealing of shallow implanted layers in Ge
C. Wündisch, M. Posselt, B. Schmidt, V. Heera, T. Schumann, A. Mücklich, R. Grötzschel, W. Skorupa, T. Clarysse, E. Simoen, and H. Hortenbach

The use of nanocavities for the fabrication of ultrathin buried oxide layers
X. Ou, R. Kögler, A. Mücklich, W. Skorupa, W. Möller, Xi Wang, and L.Vines

Light emitting field effect transistor with two self-aligned Si nanocrystal layers
V. Beyer, B. Schmidt, K.-H. Heinig, and K.-H. Stegemann

Enhanced blue-violet emission by inverse energy transfer to the Ge-related oxygen deficiency centers via Er3+ ions in metal-oxide semiconductor structures
A. Kanjilal, L. Rebohle, M. Voelskow, W. Skorupa, and M. Helm

Resonant enhancement of second order sideband generation for intraexcitonic transitions in GaAs/AlGaAs multiple quantum wells
M. Wagner, H. Schneider, S. Winnerl, M. Helm, T. Roch, A. M. Andrews, S. Schartner, and G. Strasser

Statistics

Journal Publications

Invited Conference Talks

Conference Contributions

Lectures

PhD and Diploma Theses

Organization of Conferences / Workshops

Laboratory Visits