Presentation Information
[9p-E206-8]Trion transfer in mixed-dimensional heterostructures
Nan Fang1, Ufuk Erkilic1, Chang Yih-Ren1, Shun Fujii1,2, Daiki Yamashita1,3, Chee Fai Fong1, Satoshi Morito4, Kaito Kanahashi5, Takashi Taniguchi6, Kenji Watanabe6, Keiji Ueno4, Kosuke Nagashio5, 〇Yuichiro Kato1 (1.RIKEN, 2.Keio Univ., 3.AIST, 4.Saitama Univ., 5.The Univ. of Tokyo, 6.NIMS)
Keywords:
carbon nanotubes,transition metal dichalcogenides,tungsten diselenide
Charged excitons, or trions, offering spin and charge degrees of freedom, have primarily been investigated in doped systems where charges are long considered indispensable. Here, we present an alternative route to ultraefficient trion emission from an intrinsic, defect-free semiconductor via a transfer mechanism [1]. By exciting trions in two-dimensional tungsten-diselenide donors and transferring them into one-dimensional carbon-nanotube acceptors in mixed-dimensional heterostructures [2,3], we circumvent the usual carrier requirement, overcoming intrinsic Auger-quenching limitations. Benefiting from a reservoir effect induced by dimensional heterogeneity, this process achieves trion emission efficiencies increased by over 100-fold compared to conventional doping-based approaches, and remains robust across diverse doping conditions. Our findings extend the exciton-transfer paradigm to the three-body quasiparticles, offering a platform for advancing excitonic physics and trion-based optoelectronic/spintronic applications.