期刊
PHYSICAL REVIEW B
卷 87, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.235139
关键词
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资金
- US Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515, DE-FG02-08ER46542, DE-FG02-08ER46540, DE-SC0007091]
- McDevitt bequest at Georgetown University
- US DOE, Office of Science [DE-AC02-05CH11231]
The unoccupied states of complex materials are difficult to measure, yet they play a key role in determining their properties. We propose a technique that can measure the unoccupied states, called time-resolved Compton scattering, which measures the time-dependent momentum distribution (TDMD). Using a nonequilibrium Keldysh formalism, we study the TDMD for electrons coupled to a lattice in a pump-probe setup. We find a direct relation between temporal oscillations in the TDMD and the dispersion of the underlying unoccupied states, suggesting that both can be measured by time-resolved Compton scattering. We demonstrate the experimental feasibility by applying the method to a model of MgB2 with realistic material parameters.
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