P.O. Nilsson, D.E. Eastman
Physica Scripta
We present an accurate determination of the energy dispersion (E vs k) and the first direct determination of the energy-dependent lifetime (E) of well-defined excited Bloch states in a crystal. Using angle-resolved photoemission for Cu(100), we find that the lifetime broadening increases from =1.2 eV (6 × 10-16 sec) to 1.8 eV (4 × 10-16 sec) for 1 conduction-band states ranging 10.5 to 13.5 eV above the Fermi level. The measured dispersion (2% accuracy) shows a reduced effective mass (m*m0=0.90-0.94) which is related to self-energy effects. © 1978 The American Physical Society.
P.O. Nilsson, D.E. Eastman
Physica Scripta
T.-C. Chiang, J.A. Knapp, et al.
Solid State Communications
D.E. Eastman, J.F. Janak, et al.
Journal of Applied Physics
Y.W. Mo, F.J. Himpsel
Physical Review B