▎ 摘　　要

NOVELTY - Transition metal dichalcogenide (TMDC) device (10) comprises a substrate (15), a bottom layer of boron nitride, a tungsten diselenide monolayer (12) positioned on the bottom layer of boron nitride, a top layer of boron nitride positioned on the tungsten diselenide monolayer such that the bottom layer of boron nitride and the top layer of boron nitride at least partially encapsulate the tungsten diselenide monolayer, a source electrode positioned on the substrate, a drain electrode positioned on the substrate, and a top gate electrode positioned on the top layer of boron nitride. The substrate includes a silicon dioxide layer (16) on top of a silicon layer (18). USE - Monolayer transition metal dichalcogenides device for revealing giant valley-polarized Rydberg excitons in a piezo stage microscope. ADVANTAGE - The TMDC provides an intriguing platform to investigate the different interplay between the Coulomb interaction and Landau quantization. By tuning the principal number (n) of Rydberg excitons, the smooth transition from a low to high-magnetic-field limit with a reasonable magnetic field between about 10 to about 17 T, which is drastically advantageous for detailed investigations considering the extremely strong magnetic field (≈ 91 Tesla (T)) needed previously. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a system for revealing excitons in a transition metal dichalcogenides, which comprises a broadband light source configured to emit excitation photon energy, a tunable filter configured to filter to excitation photon energy to a predetermined wavelength bandwidth, a linear polarizer configured to linearly polarize the filtered excitation photon energy, a quarter waveplate configured to convert the linearly polarized excitation photon energy into circularly polarized excitation photon energy, and a focusing element configured to focus the circularly polarized excitation photon energy to excite the transition metal dichalcogenides positioned on a piezo stage microscope, where an external magnetic field is applied to the transition metal dichalcogenides when it is exposed to the focused circularly polarized excitation photon energy; and (2) a method of revealing excitons in a transition metal dichalcogenides, which involves (a) providing the transition metal dichalcogenides, (b) exposing the transition metal dichalcogenides to an external magnetic field, (c) emitting excitation photon energy from a broadband light source, (d) filtering, via a tunable filter, the excitation photon energy to a predetermined wavelength bandwidth, (e) linearly polarizing, via a linear polarizer, the filtered excitation photon energy, (f) converting, via a quarter waveplate, the linearly polarized excitation photon energy to circularly polarized excitation photon energy, and (g) focusing, via a 50× objective, the circularly polarized excitation photon energy to a spot size of about 2 micrometers (µm) onto the tungsten diselenide monolayer of the transition metal dichalcogenides DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the TMDC device. 10TMDC device 12Tungsten diselenide monolayer 15Substrate 16Silicon dioxide layer 18Silicon layer