Quantitative Evaluation of Spatial Coherence of the Electron Beam from Low Temperature Field Emitters

Details Quantitative Evaluation of Spatial Coherence of the Electron Beam from Low Temperature Field Emitters Quantitative Evaluation of Spatial Coherence of the Electron Beam from Low Temperature Field Emitters

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvl..92x6103c&link_type=abstract

Physical Review Letters, vol. 92, Issue 24, id. 246103

Physics

17

Field Emission And Field-Ion Microscopy, Electron And Positron Beams, Diffraction And Scattering, Coherence

Scientific paper

By using multiwalled carbon nanotubes as an element of a nanobiprism, we evaluated quantitatively the coherence of electrons emitted from tungsten tips at room temperature and 78 K, and found an enhancement of coherence at 78 K. The increase of the transverse coherence length of the electron beam agreed well with that of the inelastic mean free path of electrons in solids, demonstrating the direct relationship between the coherences of the electron beam and the original electronic states. On the basis of this experimental fact, we comment on the interpretation of recent Hanbury Brown Twiss type experiments for electrons reported by Kiesel et al. [

Nature (London) 418, 392 (2002)

].

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