Probing electron-hole coherence in strongly driven 2D materials using high-harmonic generation

Heide, Christian; Kobayashi, Yuki; Johnson, Amalya C.; Liu, Fang; Heinz, Tony F.; Reis, David A.; Ghimire, Shambhu

doi:10.1364/OPTICA.444105

Probing electron-hole coherence in strongly driven 2D materials using high-harmonic generation

Journal Article · Wed May 04 00:00:00 EDT 2022 · Optica

DOI:https://doi.org/10.1364/OPTICA.444105· OSTI ID:1866286

; ; ; ; Heinz, Tony F.; ;

Under strong electromagnetic excitation, electron–hole (e-h) pairs may be generated in solids, which are subsequently driven to high energy and high momentum, producing high harmonics (HH) of the driving field. The HH efficiency depends on the degree of coherence between the driven electron and hole created by the laser field. Here, we disrupt this e-h coherence in an atomically thin semiconductor by photodoping via incoherent e-h pairs. We observe a strong, systematic harmonic order-dependent intensity reduction. This trend is explained by an exponential decay of the inter-band polarization, proportional to the sub-cycle excursion time of the e-h pair. Our study provides a platform to probe the importance of many-body effects, such as excitation density-dependent decoherence time for strongly driven electrons without the need of ultrashort laser pulses.

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Sponsoring Organization:: USDOE

OSTI ID:: 1866286

Alternate ID(s):: OSTI ID: 1864395
OSTI ID: 1875423

Journal Information:: Optica, Journal Name: Optica Journal Issue: 5 Vol. 9; ISSN 2334-2536

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Probing electron-hole coherence in strongly driven 2D materials using high-harmonic generation

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Probing electron-hole coherence in strongly driven 2D materials using high-harmonic generation

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