Directly photoexcited Dirac and Weyl fermions in ZrSiS and NbAs
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WEBER , Christopher; SCHOOP, Leslie Mareike; PARKIN, Stuart Stephen Papworth; NEWBY, Robert C.; NATEPROV, Alexandr; LOTSCH, Bettina Valeska; MARISERLA, Bala Murali Krishna; KIM, J. Matthew; DANI, Keshav Moreshwar; BECHTEL, Hans A.; ARUSHANOV, Ernest; ALI, Mazhar Nawaz. Directly photoexcited Dirac and Weyl fermions in ZrSiS and NbAs. In: Applied Physics Letters. 2018, nr. 22(113), p. 0. ISSN 0003-6951.
10.1063/1.5055207
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Applied Physics Letters
Numărul 22(113) / 2018 / ISSN 0003-6951

Directly photoexcited Dirac and Weyl fermions in ZrSiS and NbAs


DOI: 10.1063/1.5055207
Pag. 0-0

Weber Christopher1, Schoop Leslie Mareike2, Parkin Stuart Stephen Papworth3, Newby Robert C.1, Nateprov Alexandr4, Lotsch Bettina Valeska5, Mariserla Bala Murali Krishna6, Kim J. Matthew1, Dani Keshav Moreshwar6, Bechtel Hans A.7, Arushanov Ernest8, Ali Mazhar Nawaz3
 
1 Santa Clara University,
2 Princeton University, Princeton,
3 Max Planck Institute of Microstructure Physics,
4 Institute of Applied Physics, Academy of Sciences of Moldova,
5 Max Planck Institute for Solid State Research,
6 Okinawa Institute of Science and Technology Graduate University,
7 Lawrence Berkeley National Laboratory,
8 Institute of Applied Physics
 
Disponibil în IBN: 8 decembrie 2018


Rezumat

We report ultrafast optical measurements of the Dirac line-node semimetal ZrSiS and the Weyl semimetal NbAs, using mid-infrared pump photons from 86 meV to 500 meV to directly excite Dirac and Weyl fermions within the linearly dispersing bands. In NbAs, the photoexcited Weyl fermions initially form a non-thermal distribution, signified by a brief spike in the differential reflectivity whose sign is controlled by the relative energy of the pump and probe photons. In ZrSiS, electron-electron scattering rapidly thermalizes the electrons, and the spike is not observed. Subsequently, hot carriers in both materials cool within a few picoseconds. This cooling, as seen in the two materials' differential reflectivity, differs in sign, shape, and timescale. Nonetheless, we find that it may be described in a simple model of thermal electrons, without free parameters. The electronic cooling in ZrSiS is particularly fast, which may make the material useful for optoelectronic applications.

Cuvinte-cheie
Arsenic compounds, Electron scattering, Electronic cooling, Electrons, Niobium compounds, Optical data processing, Photons, Thermionic emission, Zirconium compounds, reflection, Silicon compounds