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Distinguishing the gapped and Weyl semimetal scenario in $\mathrm{Zr}{\mathrm{Te}}_{5}$: Insights from an effective two-band model

Rukelj, Z. ; Homes, C. C. ; Orlita, M. ; Akrap, Ana

In: Physical Review B, 2020, vol. 102, no. 12, p. 125201

Here we study the static and dynamic transport properties of a low-energy two-band model proposed previously in Martino et al. [PRL 122, 217402 (2019)], with an anisotropic in-plane linear momentum dependence and a parabolic out-of-plane dispersion. The model is extended to include a negative band gap, which leads to the emergence of a Weyl semimetal (WSM) state, as opposed to the gapped...

Optical conductivity of the type-II Weyl semimetal TaIrTe4

Mardelé, F. Le ; Santos-Cottin, D. ; Martino, E. ; Semeniuk, K. ; David, S. Ben ; Orbanić, F. ; Novak, Mark ; Rukelj, Z. ; Homes, C. C. ; Akrap, Ana

In: Physical Review B, 2020, vol. 102, no. 4, p. 045201

TaIrTe4 is an example of a candidate Weyl type-II semimetal with a minimal possible number of Weyl nodes. Four nodes are reported to exist in a single plane in k space. The existence of a conical dispersion linked toWeyl nodes has yet to be shown experimentally. Here, we use optical spectroscopy as a probe of the band structure on a low-energy scale. Studying optical conductivity allows us to...

Probing intraband excitations in ${\mathrm{ZrTe}}_{5}$: A high-pressure infrared and transport study

Santos-Cottin, D. ; Padlewski, M. ; Martino, E. ; David, S. Ben ; Mardelé, F. Le ; Capitani, F. ; Borondics, F. ; Bachmann, M. D. ; Putzke, C. ; Moll, P. J. W. ; Zhong, R. D. ; Gu, G. D. ; Berger, H. ; Orlita, M. ; Homes, C. C. ; Rukelj, Z. ; Akrap, Ana

In: Physical Review B, 2020, vol. 101, no. 12, p. 125205

Zirconium pentatetelluride, ZrTe5, shows remarkable sensitivity to hydrostatic pressure. In this work we address the high-pressure transport and optical properties of this compound, on samples grown by flux and chemical vapor transport. The high-pressure resistivity is measured up to 2 GPa, and the infrared transmission up to 9 GPa. The dc conductivity anisotropy is determined using a...

Low-energy excitations in type-II Weyl semimetal ${T}_{d}\text{\ensuremath{-}}{\mathrm{MoTe}}_{2}$ evidenced through optical conductivity

Santos-Cottin, David ; Martino, Edoardo ; Le Mardelé, Florian ; Witteveen, C. ; Rohr, F. O. von ; Homes, C. C. ; Rukelj, Z. ; Akrap, Ana

In: Physical Review Materials, 2020, vol. 4, no. 2, p. 021201

Molybdenum ditelluride, MoTe2, is a versatile material where the topological phase can be readily tuned by manipulating the associated structural phase transition. The fine details of the band structure of MoTe2, key to understanding its topological properties, have proven difficult to disentangle experientially due to the multiband character of the material. Through experimental optical...

Bound Excitons in Sr₂CuO₃

Kim, Kyung Wan ; Gu, G. D. ; Homes, C. C. ; Noh, T. W.

In: Physical Review Letters, 2008, vol. 101, no. 17, p. 177404

We investigated temperature dependent optical spectra of the one-dimensional chain compound Sr₂CuO₃. The charge transfer transition polarized along the chain direction shows a strongly asymmetric line shape as expected in one-dimensional extended Hubbard model. At low temperature, the charge transfer peak shows a large blueshift and reveals additional sharp peaks at the gap. Even though many...

Doping of a one-dimensional Mott insulator: Photoemission and optical studies of Sr₂CuO₃₊δ

Kidd, T. E. ; Valla, T. ; Johnson, P. D. ; Kim, Kyung Wan ; Gu, G. D. ; Homes, C. C.

In: Physical Review B, 2008, vol. 77, p. 054503