All-optical reconstruction of crystal band structure

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.115.193603
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume115
Pages193603-1193603-5
AbstractThe band structure of matter determines its properties. In solids, it is typically mapped with angle-resolved photoemission spectroscopy, in which the momentum and the energy of incoherent electrons are independently measured. Sometimes, however, photoelectrons are difficult or impossible to detect. Here we demonstrate an all-optical technique to reconstruct momentum-dependent band gaps by exploiting the coherent motion of electron-hole pairs driven by intense midinfrared femtosecond laser pulses. Applying the method to experimental data for a semiconductor ZnO crystal, we identify the split-off valence band as making the greatest contribution to tunneling to the conduction band. Our new band structure measurement technique is intrinsically bulk sensitive, does not require a vacuum, and has high temporal resolution, making it suitable to study reactions at ambient conditions, matter under extreme pressures, and ultrafast transient modifications to band structures.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21277168
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Record identifierbf6df7cb-473e-45a2-954a-873783db068a
Record created2015-12-23
Record modified2016-05-09
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