4.6 Article

Imaging Seebeck drift of excitons and trions in MoSe2 monolayers

期刊

2D MATERIALS
卷 8, 期 4, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/ac171f

关键词

monolayers; Seebeck; drift; 2D materials; photoluminescence; MoSe2

资金

  1. SpinCAT [ANR-18-CE24-0011-01]
  2. Institut Universitaire de France
  3. Labex NEXT
  4. ANR Vallex
  5. Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
  6. JSPS KAKENHI [JP20H00354]

向作者/读者索取更多资源

Hyperspectral imaging at cryogenic temperatures was used to study the propagation of excitons and trions in MoSe2 monolayers encapsulated with hBN. Differences in the spatial distribution of these particles were observed at high excitation densities, with trions showing a halo shape and excitons only exhibiting moderate broadening. Numerical simulations suggest that the discrepancy in profiles is due to the distinct lifetimes of the two quasiparticles.
Hyperspectral imaging at cryogenic temperatures is used to investigate exciton and trion propagation in MoSe2 monolayers (ML) encapsulated with hexagonal boron nitride (hBN). Under a tightly focused, continuous-wave laser excitation, the spatial distribution of neutral excitons and charged trions strongly differ at high excitation densities. Remarkably, in this regime the trion distribution develops a halo shape, similar to that previously observed in WS2 ML at room temperature and under pulsed excitation. In contrast, the exciton distribution only presents a moderate broadening attributed to a much less pronounced halo. Spatially and spectrally resolved luminescence spectra reveal the buildup of a significant temperature gradient at high excitation power, that is attributed to the energy relaxation of photoinduced hot carriers. We show, via a numerical resolution of the transport equations for excitons and trions, that the halo can be interpreted as thermal drift of trions due to a Seebeck term in the particle current. The model shows that the difference between trion and exciton profiles is simply understood in terms of the very different lifetimes of these two quasiparticles.

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