Ultrastrong Coupling of Band?Nested Excitons in Few?Layer Molybdenum Disulphide

The 2D transition-metal dichalcogenides (2D TMDCs) are an intriguing platform for studying strong light–matter interactions because they combine the electronic properties of conventional semiconductors with optical resonances found in organic systems. However, coupling strengths demonstrated exciton–polariton TMDCs remain much lower than those In this paper, a new approach is taken by utilizing large oscillator strength above-band gap C exciton few-layer molybdenum disulphide (FL-MoS2). A k-space Rabi splitting 293 meV shown when FL-MoS2 excitons to surface plasmon polaritons at room temperature. This value 11% uncoupled energy (2.67 eV or 464 nm), ?2× what typically seen TMDCs, placing system ultrastrong regime. results take step toward finally achieving efficient quantum coherent processes CMOS-compatible system—the TMDCs—in visible spectrum.