Title: Spinová polarizácia a attosekudové časové meškanie vo fotoemisii spinovo degenerovaného stavu v tuhej látke
Spin Polarization and Attosecond Time Delay in Photoemission from Spin Degenerate States of Solids
Authors: Fanciulli, Mauro
Volfová, Henrieta
Muff, Stefan
Braun, Jürgen
Ebert, Hubert
Minár, Jan
Heinzmann, Ulrich
Dil, Jan Hugo
Citation: FANCIULLI, M., VOLFOVÁ, H., MUFF, S., BRAUN, J., EBERT, H., MINÁR, J., HEINZMANN, U., DIL, J. H. Spin Polarization and Attosecond Time Delay in Photoemission from Spin Degenerate States of Solids. Physical review letters, 2017, roč. 118, č. 6. ISSN 0031-9007.
Issue Date: 2017
Publisher: American Physical Society
Document type: článek
URI: http://hdl.handle.net/11025/29240
ISSN: 0031-9007
Keywords: fotoemisia, attosekundová dynamika, jednokrokový model fotoemisie
Keywords in different language: photoemission, attoseconds dynamics, one-step model of photoemission
Abstract: Poďla Eisenbud-Wigner-Smithovho modelu, časové meškanie po absorpcii svetla je možné vysvetliť pomocou fǎzového posunu. V tejto práci sme ukázali že tento posun je možné merať v spinovo a uhlovo rozlýšenej fotoemisii na 111 povrchu Cu. Tieto merania sme modelovali novým modelom ktorý umožnǐ vysvetliť tento fenomén v budúcich meraniach.
Abstract in different language: After photon absorption, electrons from a dispersive band of a solid require a finite time in the photoemission process before being photoemitted as free particles, in line with recent attosecond-resolved photoemission experiments. According to the Eisenbud-Wigner-Smith model, the time delay is due to a phase shift of different transitions that occur in the process. Such a phase shift is also at the origin of the angular dependent spin polarization of the photoelectron beam, observable in spin degenerate systems without angular momentum transfer by the incident photon. We propose a semiquantitative model which permits us to relate spin and time scales in photoemission from condensed matter targets and to better understand spin- and angle-resolved photoemission spectroscopy (SARPES) experiments on spin degenerate systems. We also present the first experimental determination by SARPES of this time delay in a dispersive band, which is found to be greater than 26 as for electrons emitted from the sp-bulk band of the model system Cu(111).
Rights: © American Physical Society
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