Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4770289
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Funding
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [23000010, 10J07206] Funding Source: KAKEN
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We report angle-resolved photoemission spectroscopy (ARPES) on a GaAs thin film protected by an amorphous As layer with thickness exceeding the typical probing depths of vacuum-ultraviolet rays up to similar to 100 eV. Increasing the probing depth by increasing photon energy into the soft x-ray (SX) region of several hundred eV clearly exposes the bulk band dispersion of the GaAs underlayer without any surface treatment. Our results demonstrate that the use of SX-ARPES enables access to the three-dimensional band dispersion of buried underlayer through an amorphous overlayer. This opens frontiers in diagnostics of authentic momentum-resolved electronic structure of protected thin-film heterostructures. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770289]
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