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Trion Valley Coherence in Monolayer Semiconductors
Kai Hao, Lixiang Xu, Fengcheng Wu +8
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating…
Impact of Grain Boundaries on Efficiency and Stability of Organic-Inorganic Trihalide Perovskites
Zhaodong Chu, Mengjin Yang, Philip Schulz +7
Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies (PCEs). To further improve the device pe…
Neutral and Charged Inter-Valley Biexcitons in Monolayer MoSe
Kai Hao, Lixiang Xu, Judith F. Specht +10
In atomically thin transition metal dichalcogenides (TMDs), reduced dielectric screening of the Coulomb interaction leads to strongly correlated many-body states, including exciton…
Long-Lived Valley Polarization of Intra-Valley Trions in Monolayer WSe2
Akshay Singh, Kha Tran, Mirco Kolarczik +9
We investigate valley dynamics associated with trions in monolayer tungsten diselenide (WSe2) using polarization resolved two-color pump-probe spectroscopy. When tuning the pump an…
Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2
Kai Hao, Lixiang Xu, Philipp Nagler +7
The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron-hole pairs) and charged excitons (trions) that are stable…
Enhanced spin lifetimes in a two dimensional electron gas in a gate-controlled GaAs quantum well
Sergiu Anghel, Akshay Singh, Felix Passmann +5
Exciton, trion and electron spin dynamics in a 20 nm wide modulation-doped GaAs single quantum well are investigated using resonant ultrafast two-color Kerr rotation spectroscopy.…