The ratio of pump-induced oscillatory current during versus after an ultrafast pulse has a minimum when the Fermi energy crosses a saddle point, offering an optical signature of Lifshitz transitions.
In.ACM, New York, NY, USA, 12 pages
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Probing Fermi surface topology by ultrafast pump pulse dynamics
The ratio of pump-induced oscillatory current during versus after an ultrafast pulse has a minimum when the Fermi energy crosses a saddle point, offering an optical signature of Lifshitz transitions.