Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.076601
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Funding
- Center for Integrated Quantum Materials under NSF [DMR-1231319]
- MIT Center for Excitonics, an EFRC - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001088]
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In Dirac materials linear band dispersion blocks momentum-conserving interband transitions, creating a bottleneck for electron-hole pair production and carrier multiplication in the photoexcitation cascade. Here we show that the decays are unblocked and the bottleneck is relieved by subtle many-body effects involving multiple off-shell e-h pairs. The decays result from a collective behavior due to simultaneous emission of many soft pairs. We discuss characteristic signatures of the off-shell pathways, in particular the sharp angular distribution of secondary carriers, resembling relativistic jets in high-energy physics. The jets can be directly probed using solid-state equivalent of particle detectors. Collinear scattering enhances carrier multiplication, allowing for emission of as many as similar to 10 secondary carriers per single absorbed photon.
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