Signatures of Multiband Effects in High-Harmonic Generation in Monolayer MoS 2
- Louisiana State Univ., Baton Rouge, LA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Friedrich Schiller Univ., Jena (Germany)
- Friedrich Schiller Univ., Jena (Germany); Helmholtz Institute, Jena (Germany)
- Yale Univ., New Haven, CT (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Friedrich Schiller Univ., Jena (Germany)
High-harmonic generation (HHG) in solids has been touted as a way to probe ultrafast dynamics and crystal symmetries in condensed matter systems. Here, we investigate the polarization properties of high-order harmonics generated in monolayer MoS2, as a function of crystal orientation relative to the mid-infrared laser field polarization. At several different laser wavelengths we experimentally observe a prominent angular shift of the parallel-polarized odd harmonics for energies above approximately 3.5 eV, and our calculations indicate that this shift originates in subtle differences in the recombination dipole strengths involving multiple conduction bands. Further, this observation is material specific and is in addition to the angular dependence imposed by the dynamical symmetry properties of the crystal interacting with the laser field, and may pave the way for probing the vectorial character of multiband recombination dipoles.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Yale Univ., New Haven, CT (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Alexander von Humboldt Foundation; Federal Ministry of Education and Research (BMBF); W. M. Keck Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; PHY-1713671; PHY-2110317; 57427209; SC0021965
- OSTI ID:
- 1902671
- Alternate ID(s):
- OSTI ID: 1903591
- Journal Information:
- Physical Review Letters, Vol. 129, Issue 14; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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