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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hofmann, Johannes
University of Gothenburg
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2020Probing embedded topological modes in bulk-like GeTe-Sb 2 Te 3 heterostructurescitations
- 2020Probing embedded topological modes in bulk-like GeTe-Sb$_2$Te$_3$ heterostructures
- 2020Probing embedded topological modes in bulk-like GeTe-Sb2Te3 heterostructurescitations
- 2016Formation of silicon nanocrystals in silicon carbide using flash lamp annealingcitations
- 2015Optical evidence for a Weyl semimetal state in pyrochlore Eu2Ir2O7citations
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document
Optical evidence for a Weyl semimetal state in pyrochlore Eu2Ir2O7
Abstract
A Weyl semimetallic state with pairs of nondegenerate Dirac cones in three dimensions was recently predicted to occur in the antiferromagnetic state of the pyrochlore iridates. Here, we show that the THz optical conductivity and temperature dependence of free carriers in the pyrochlore Eu2Ir2O7 match the predictions for a Weyl semimetal and suggest novel Dirac liquid behavior. The interband optical conductivity vanishes continuously at low frequencies signifying a semimetal. The metal-insulator transition at T_N = 110 K is manifested in the Drude spectral weight, which is independent of temperature in the metallic phase, and which decreases smoothly in the ordered phase. The temperature dependence of the free carrier weight below T_N is in good agreement with theoretical predictions for a Dirac material. The data yield a Fermi velocity v_F=4x10^7 cm/s, a logarithmic renormalization scale Lambda_L=600 K, and require a Fermi temperature of T_F=100 K associated with residual unintentional doping to account for the low temperature optical response and dc resistivity.