Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: Transport in high magnetic fields / Quantum Hall effect

HL 45.5: Vortrag

Dienstag, 12. März 2013, 16:00–16:15, H13

Modification to the central-cell correction of germanium acceptors — •Oleksiy Drachenko¹, Dmitry Kozlov², Anton Ikonnikov², Vladimir Gavrilenko², Harald Schneider¹, Manfred Helm², and Jochen Wosnitza³ — ¹Helmholtz Zentrum Dresden Rossendorf, Inst Ion Beam Phys & Mat Res, D-01314 Dresden, Germany — ²Russian Acad Sci, Inst Phys Microstruct, Nizhnii Novgorod 603950, Russia — ³Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab HLD, D-01314 Dresden, Germany

In this work, we report a correction to the model potential of the Ga acceptor in germanium, evidenced by high-magnetic-field photoconductivity measurements. We found that under high magnetic fields the chemical shift of the binding energy of Ga acceptors vanishes, contrary to the results given by the generally accepted theory. To fit our data, we found that the central-cell correction should contain a repulsive part (i.e., it must be bipolar), in contrast to the purely attractive screened point-charge potential widely used in the literature.