188 citations · 942 across the 17 of their papers we have counts for
8 papers · 1 filter
Circular photogalvanic effects in topological insulator/ferromagnet hybrid structures
T. Schumann, T. Kleinke, L. Braun +12
We study laser driven spin-current effects at ferromagnet/topological-insulator interfaces by two complementary experimental approaches. The DC photocurrent is studied in ferromagn…
Topological surface states in strained Dirac semimetal thin films
Pablo Villar Arribi, Jian-Xin Zhu, Timo Schumann +3
We computationally study the Fermi arc states in a Dirac semimetal, both in a semi-infinite slab and in the thin-film limit. We use CdA as a model system, and include pertu…
Determination of the crystal field splitting energy in Cd3As2 using magnetooptics
G. Krizman, T. Schumann, S. Tchoumakov +4
Symmetry considerations are of extreme importance to the topological properties of crystals. A crystal field splitting δ yields Dirac nodes near the Brillouin zone center in Cd3As2…
A Large Effective Phonon Magnetic Moment in a Dirac Semimetal
Bing Cheng, T. Schumann, Y. C. Wang +4
We investigated the magnetoterahertz response of the Dirac semimetal CdAs and observed a particularly low frequency optical phonon, as well as a very prominent and field se…
Absence of signatures of Weyl orbits in the thickness dependence of quantum transport in cadmium arsenide
Luca Galletti, Timo Schumann, David A. Kealhofer +2
In a Weyl orbit, the Fermi arc surface states on opposite surfaces of the topological semimetal are connected through the bulk Weyl or Dirac nodes. Having a real-space component, t…
Two-Dimensional Dirac Fermions in Thin Films of Cd3As2
Luca Galletti, Timo Schumann, Omor F. Shoron +4
Two-dimensional states in confined thin films of the three-dimensional Dirac semimetal Cd3As2 are probed by transport and capacitance measurements under applied magnetic and electr…
Observation of the quantum Hall effect in confined films of the three-dimensional Dirac semimetal Cd3As2
Timo Schumann, Luca Galletti, David A. Kealhofer +3
The magnetotransport properties of epitaxial films of Cd3As2, a paradigm three-dimensional Dirac semimetal, are investigated. We show that an energy gap opens in the bulk electroni…
Negative magnetoresistance due to conductivity fluctuations in films of the topological semimetal Cd3As2
Timo Schumann, Manik Goyal, David A. Kealhofer +1
Recently discovered Dirac and Weyl semimetals display unusual magnetoresistance phenomena, including a large, non-saturating, linear transverse magnetoresistance and a negative lon…