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Consortium of Swiss Academic Libraries

The Topological Open String Wavefunction

Grassi, Alba ; Källén, Johan ; Mariño, Marcos

In: Communications in Mathematical Physics, 2015, vol. 338, no. 2, p. 533-561

Université de Fribourg

Magneto-optics of a Weyl semimetal beyond the conical band approximation: case study of tap

Polatkan, S. ; Goerbig, M. O. ; Wyzula, J. ; Kemmler, R. ; Maulana, L. Z. ; Piot, B. A. ; Crassee, I. ; Akrap, Ana ; Shekhar, C. ; Felser, C. ; Dressel, M. ; Pronin, A. V. ; Orlita, M.

In: Physical Review Letters, 2020, vol. 124, no. 17, p. 176402

Landau-level spectroscopy, the optical analysis of electrons in materials subject to a strong magnetic field, is a versatile probe of the electronic band structure and has been successfully used in the identification of novel states of matter such as Dirac electrons, topological materials or Weyl semimetals. The latter arise from a complex interplay between crystal symmetry, spin-orbit...

Université de Fribourg

Assessment of the potential for in-plume sulphur dioxide gas-ash interactions to influence the respiratory toxicity of volcanic ash

Tomašek, Ines ; Damby, David E. ; Horwell, Claire J. ; Ayris, Paul M. ; Delmelle, Pierre ; Ottley, Christopher J. ; Cubillas, Pablo ; Casas, Ana S. ; Bisig, Christoph ; Petri-Fink, Alke ; Dingwell, Donald B. ; Clift, Martin J. D. ; Drasler, Barbara ; Rothen-Rutishauser, Barbara

In: Environmental Research, 2019, vol. 179, p. 108798

Volcanic plumes are complex environments composed of gases and ash particles, where chemical and physical processes occur at different temperature and compositional regimes. Commonly, soluble sulphate- and chloride-bearing salts are formed on ash as gases interact with ash surfaces. Exposure to respirable volcanic ash following an eruption is potentially a significant health concern. The...

Université de Fribourg

The Regge symmetry, confocal conics, and the Schläfli formula

Akopyan, Arseniy ; Izmestiev, Ivan

In: Bulletin of the London Mathematical Society, 2019, p. blms.12276

The Regge symmetry is a set of remarkable relations between two tetrahedra whose edge lengths are related in a simple fashion. It was first discovered as a consequence of an asymptotic formula in mathematical physics. Here, we give a simple geometric proof of Regge symmetries in Euclidean, spherical, and hyperbolic geometry.

Université de Fribourg

Two-dimensional conical dispersion in ${\mathrm{ZrTe}}_{5}$ evidenced by optical spectroscopy

Martino, Edoardo ; Crassee, Iris ; Eguchi, Gaku ; Santos-Cottin, David ; Zhong, R. D. ; Gu, G. D. ; Berger, H. ; Rukelj, Zoran ; Orlita, M. ; Homes, Chris C. ; Akrap, Ana

In: Physical Review Letters, 2019, vol. 122, no. 21, p. 217402

Zirconium pentatelluride was recently reported to be a 3D Dirac semimetal, with a single conical band, located at the center of the Brillouin zone. The cone’s lack of protection by the lattice symmetry immediately sparked vast discussions about the size and topological or trivial nature of a possible gap opening. Here, we report on a combined optical and transport study of ZrTe5, which...

Consortium of Swiss Academic Libraries

Controlling General Polynomial Networks

Cuneo, N. ; Eckmann, J.

In: Communications in Mathematical Physics, 2014, vol. 328, no. 3, p. 1255-1274