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research article

Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3

Crepaldi, A.  
•
Ressel, B.
•
Cilento, F.
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2012
Physical Review B

We exploit time- and angle-resolved photoemission spectroscopy to determine the evolution of the out-of-equilibrium electronic structure of the topological insulator Bi2Se3. The response of the Fermi-Dirac distribution to ultrashort IR laser pulses has been studied by modeling the dynamics of hot electrons after optical excitation. We disentangle a large increase in the effective temperature (T*) from a shift of the chemical potential (mu*), which is consequence of the ultrafast photodoping of the conduction band. The relaxation dynamics of T* and mu* are k independent and these two quantities uniquely define the evolution of the excited charge population. We observe that the energy dependence of the nonequilibrium charge population is solely determined by the analytical form of the effective Fermi-Dirac distribution.

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Type
research article
DOI
10.1103/PhysRevB.86.205133
Web of Science ID

WOS:000311715100007

Author(s)
Crepaldi, A.  
Ressel, B.
Cilento, F.
Zacchigna, M.
Grazioli, C.
Berger, H.  
Bugnon, Ph.
Kern, K.  
Grioni, M.  
Parmigiani, F.
Date Issued

2012

Publisher

Amer Physical Soc

Published in
Physical Review B
Volume

86

Issue

20

Article Number

205133

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSEN  
LSE  
Available on Infoscience
February 27, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/89231
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