Figure | Key results and the interpretation (IMAGE)
Caption
Figure | Key results and the interpretation a), Device structure: a monolayer of MoTe2 is sandwiched between two thin boron nitride layers. A thin graphene layer is used for contacting MoTe2 from the top. Gate voltage is applied below the bottom boron nitride layer. b), Schematic energy scheme showing the pump exciting electrons to form various excitonic two-body (2B) states. The absorption of a probe photon then elevates the system from 2B states to various four-body (4B) states. These 4B states could include bi-excitons and various states of quadruplons. c), The red-yellow contour shows the spectrum versus gate voltage as measured by an absorption spectroscopy with a continuous laser where the spectral position of exciton (X) and trion (T) are marked by the vertical lines. At the charge neutral gate voltage, the exciton shows a maximum and trion shows a minimum. There is no measurable spectral features below exciton near charge-neutral voltage. The ultrafast pump-probe differential absorption spectrum (lower part) shows up to six pronounced peaks marked by the dashed lines and linked to the white solid dashed bars. Our theory relates these six new peaks to a special set of the 2B-4B transitions shown in Fig. b) where 4B states are related to the four-order clusters only.
Credit
by Jiacheng Tang, Cun-Zheng Ning et al.
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