Repozitorij Univerze v Novi Gorici

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Naslov:Orbital selective dynamics in Fe-pnictides triggered by polarized pump pulse excitations
Avtorji:Adhikary, Ganesh (Avtor)
Saha, Tanusree (Avtor)
Rebernik Ribič, Primož (Avtor)
Stupar, Matija (Avtor)
Ressel, Barbara (Avtor)
Urbančič, Jurij (Avtor)
De Ninno, Giovanni (Avtor)
Thamizhavel, A. (Avtor)
Maiti, Kalobaran (Avtor)
Datoteke:Gradivo nima datotek. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Quantum materials display exotic behaviours related to the interplay between temperature-driven phase transitions. Here, we study the electron dynamics in one such material, CaFe$_2$As$_2$, a parent Fe-based superconductor, employing time and angle-resolved photoemission spectroscopy. CaFe$_2$As$_2$ exhibits concomitant transition to spin density wave state and tetragonal to orthorhombic structure below 170 K. The Fermi surface of this material consists of three hole pockets ($\alpha$, $\beta$ and $\gamma$) around $\Gamma$-point and two electron pockets around $X$-point. The hole pockets have $d_{xy}$, $d_{yz}$ and $d_{zx}$ orbital symmetries. The $\beta$ band constituted by $d_{xz}$/$d_{yz}$ orbitals exhibit a gap across the magnetic phase transition. We discover that polarized pump pulses can induce excitations of electrons of a selected symmetry. More specifically, while $s$-polarized light (polarization vector perpendicular to the $xz$-plane) excites electrons corresponding to all the three hole bands, $p$-polarized light excites electrons essentially from ($\alpha$,$\beta$) bands which are responsible for magnetic order. Interestingly, within the magnetically ordered phase, the excitation due to the $p$-polarized pump pulses occur at a time scale of 50 fs, which is significantly faster than the excitation induced by $s$-polarized light ($\sim$ 200 fs). These results suggest that the relaxation of different ordered phases occurs at different time scales and this method can be used to achieve selective excitations to disentangle complexity in the study of quantum materials.
Ključne besede:Electronic structure, Pnictides and chalcogenides, Time-resolved spectroscopy
Leto izida:2021
Št. strani:str. 1-6
Številčenje:no. , Vol.
COBISS_ID:80409859 Povezava se odpre v novem oknu
UDK:53
ISSN pri članku:0295-5075
URN:URN:SI:UNG:REP:XFFPWLPE
DOI:10.1209/0295-5075/ac2dc0 Povezava se odpre v novem oknu
Licenca:CC BY 4.0
To delo je dosegljivo pod licenco Creative Commons Priznanje avtorstva 4.0 Mednarodna
Število ogledov:243
Število prenosov:0
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Področja:Gradivo ni uvrščeno v področja.
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Skupna ocena:(0 glasov)
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Gradivo je del revije

Naslov:Europhysics letters
Skrajšan naslov:Europhys. lett.
Založnik:Les Ed. de physique
ISSN:0295-5075
COBISS.SI-ID:25434880 Novo okno

Gradivo je financirano iz projekta

Financer:EC - Evropska skupnost (EC)
Program financ.:H2020 - Hoizon 2020 Programme funded by European Commission
Številka projekta:
Naslov:
Akronim:NFFA and DIMAG
ID projekta:

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:electronic structure, pnictides, chalcogenides, time-resolved spectroscopy


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