Dispersion of quantum well states in Cu/Co/Cu(001)

Y. Z. Wu; C. Y. Won; E. Rotenberg; H. W. Zhao; F. Toyoma; N. V. Smith; Z. Q. Qiu

doi:10.1103/PhysRevB.66.245418

Dispersion of quantum well states in Cu/Co/Cu(001)

Y. Z. Wu, C. Y. Won, E. Rotenberg, H. W. Zhao, F. Toyoma, N. V. Smith, and Z. Q. Qiu

Phys. Rev. B 66, 245418 – Published 27 December 2002

Abstract

Quantum well states (QWS’s) in Cu thin films grown on Co/Cu(001) were studied using angle-resolved photoemission spectroscopy. For the normal photoemission, QWS’s from both lower and higher energy bands relative to the vacuum level were measured, and explained by phase accumulation method. QWS’s from the lower band were studied in detail as a function of the in-plane momentum $k_{∥} .$ We found that the QWS dispersion depends on the Cu film thickness. From the experimental data, we deduced the quantized perpendicular momentum $k_{⊥}$ and the energy as a function of $k_{∥} .$ Our results show that the in-plane effective mass can not be obtained by a simple parabolic fitting of the E vs $k_{∥}$ due to the dependence of $k_{⊥}$ on $k_{∥} .$

Received 28 May 2002

DOI:https://doi.org/10.1103/PhysRevB.66.245418

Authors & Affiliations

Y. Z. Wu¹, C. Y. Won¹, E. Rotenberg², H. W. Zhao^1,3, F. Toyoma¹, N. V. Smith², and Z. Q. Qiu^1,4

¹Department of Physics, University of California, Berkeley, California 94720
²Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720
³International Center for Quantum Structures, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
⁴Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

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Vol. 66, Iss. 24 — 15 December 2002

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