For intraband absorption in a single Weyl node, semiclassical and quantum calculations of the circular photogalvanic effect give different currents, implying an unidentified semiclassical mechanism.
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Intraband circular photogalvanic effect in Weyl semimetals
For intraband absorption in a single Weyl node, semiclassical and quantum calculations of the circular photogalvanic effect give different currents, implying an unidentified semiclassical mechanism.