206 citations · 3.2k across the 95 of their papers we have counts for
10 papers · 1 filter
Spin-conserving Boltzmann theory for carriers and excitons in organic semiconductors
Charlotte Bäcker, Linus Thummel, Carsten Timm
The rise of organic electronics calls for versatile modeling tools. In this context, we develop a semiclassical Boltzmann theory that describes transport and excitonic processes in…
Metastable giant moments in Gd-implanted GaN, Si, and sapphire
X. Wang, C. Timm, X. M. Wang +4
We report on Gd ion implantation and magnetic characterization of GaN films on sapphire substrates and of bare sapphire and Si substrates to shed light on the mechanism underlying…
Hysteresis in the magneto-transport of Manganese-doped Germanium: evidence for carrier-mediated ferromagnetism
Shengqiang Zhou, Danilo Buerger, Arndt Muecklich +6
We report the fabrication of Ge:Mn ferromagnetic semiconductors by Mn-ion implantation into Ge followed by pulsed laser annealing. Benefiting from the short time annealing, the hol…
Anomalous Hall effect in a two-dimensional electron gas
Tamara S. Nunner, N. A. Sinitsyn, Mario F. Borunda +7
The anomalous Hall effect in a magnetic two-dimensional electron gas with Rashba spin-orbit coupling is studied within the Kubo-Streda formalism in the presence of pointlike potent…
Absence of skew scattering in two-dimensional systems: Testing the origins of the anomalous Hall effect
Mario F. Borunda, Tamara S. Nunner, Thomas Luck +6
We study the anomalous Hall conductivity in spin-polarized, asymmetrically confined two-dimensional electron and hole systems, focusing on skew-scattering contributions to the tran…
Possible magnetic-field-induced voltage and thermopower in diluted magnetic semiconductors
Carsten Timm
In diluted magnetic semiconductors, the carrier concentration and the magnetization of local moments are strongly coupled, since the magnetic interaction is mediated by the carrier…
Charge and Magnetization Inhomogeneities in Diluted Magnetic Semiconductors
Carsten Timm
It is predicted that III-V diluted magnetic semiconductors can exhibit stripe-like modulations of magnetization and carrier concentration. This inhomogeneity results from the stron…
Influence of non-local exchange on RKKY interactions in III-V diluted magnetic semiconductors
C. Timm, A. H. MacDonald
The RKKY interaction between substitutional Mn local moments in GaAs is both spin-direction-dependent and spatially anisotropic. In this Letter we address the strength of these ani…
Optical properties of metallic (III,Mn)V ferromagnetic semiconductors in the infrared to visible range
E. M. Hankiewicz, T. Jungwirth, T. Dietl +2
We report on a study of the ac conductivity and magneto-optical properties of metallic ferromagnetic (III,Mn)V semiconductors in the infrared to visible spectrum. Our analysis is b…
Defect correlations, metal-insulator transition, and magnetic order in ferromagnetic semiconductors
Carsten Timm, Felix von Oppen
Diluted ferromagnetic III-V semiconductors typically show a high degree of compensation. Compensation is connected to the presence of comparable densities of charged defects of eit…