In: The European Physical Journal B, 2015, vol. 88, no. 3, p. 1-12
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In: Annales Henri Poincaré, 2015, vol. 16, no. 1, p. 99-112
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In: The European Physical Journal Special Topics, 2015, vol. 224, no. 12, p. 2305-2320
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In: Communications in Mathematical Physics, 2015, vol. 333, no. 2, p. 761-798
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In: Annales Henri Poincaré, 2015, vol. 16, no. 8, p. 1937-1967
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In: Physical Review B, 2021, vol. 103, no. 12, p. L121103
With infrared spectroscopy, we studied the bulk electronic properties of the topological antiferromagnet MnBi2Te4 with TN ≃ 25 K. With the support of band-structure calculations, we assign the intra- and interband excitations and determine the band gap of Eg ≈ 0.17 eV. We also obtain evidence for two types of conduction bands with light and very heavy carriers. The multiband free-carrier...
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In: Proceedings of the National Academy of Sciences, 2020, vol. 117, no. 44, p. 27104–27110
We report the optical conductivity in high-quality crystals of the chiral topological semimetal CoSi, which hosts exotic quasiparticles known as multifold fermions. We find that the optical response is separated into several distinct regions as a function of frequency, each dominated by different types of quasiparticles. The low-frequency intraband response is captured by a narrow Drude peak...
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In: Physical Review X, 2020, vol. 10, no. 4, p. 041013
Pumping graphene with circularly polarized light is the archetype of light-tailoring topological bands. Realizing the induced Floquet-Chern-insulator state and demonstrating clear experimental evidence for its topological nature has been a challenge, and it has become clear that scattering effects play a crucial role. We tackle this gap between theory and experiment by employing microscopic...
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In: Nature Physics, 2020, p. -
Nd2Ir2O7 is a correlated semimetal with the pyrochlore structure, in which competing spin–orbit coupling and electron–electron interactions are believed to induce a time- reversal symmetry-broken Weyl semimetal phase characterized by pairs of topologically protected Dirac points at the Fermi energy1,2,3,4. However, the emergent properties in these materials are far from clear, and exotic...
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In: Science Advances, 2020, vol. 6, no. 9, p. eaay2730
Topologically nontrivial two-dimensional materials hold great promise for next- generation optoelectronic applications. However, measuring the Hall or spin-Hall response is often a challenge and practically limited to the ground state. An experimental technique for tracing the topological character in a differential fashion would provide useful insights. In this work, we show that circular...
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