Control of light–valley interactions in 2D transition metal dichalcogenides with nanophotonic structures

Abstract

Electronic valley in two-dimensional transition-metal dichalcogenides (2D TMDCs) offers a new degree of freedom for information storage and processing. The valley pseudospin can be optically encoded by photons with specific...

Chiral molecule induced valley polarization enhancement of MoS2

“…Transition metal dichalcogenides (TMDCs) have attracted extensive attention due to their unique photonic and optoelectronic properties. [1][2][3][4][5][6] When a TMDC is thinned down to a monolayer (ML), it becomes a direct-bandgap material with gaps located at the K and ÀK points in the corners of the Brillouin zone. Furthermore, ML TMDCs with a broken inversion symmetry possess two degenerate yet inequivalent valleys, which are related by the time-reversal symmetry.…”

Recent advances on strong light-matter coupling in atomically thin TMDC semiconductor materials

“…A more interesting way to exploit the potential of TMDC valley polarization is by strongly coupling it to photonic spinorbit interactions (SOIs) rather than to a normal cavity mode, which is known as chiral coupling [110,111]. Such photonic SOIs happen in a nanophotonic system (i.e.…”

Ultrafast carrier dynamics in vanadium-doped MoS2 alloys

“…Monolayer transition metal dichalcogenides (TMDCs) are not only interesting for studying many-body interactions among quasiparticles, [1][2][3] but also have shown application potential in flexible optoelectronics, 4,5 valleytronics, and quantum devices. 6,7 In TMDCs, the 'd' orbitals of the metal are major contributors to the edges of the conduction band (CB) and valence band (VB). 8,9 The strong spin-orbit coupling leads to the splitting of the CB and VB, 8,9 which introduces non-identical valleys (at k and −k) in TMDCs.…”

“…8,9 The strong spin–orbit coupling leads to the splitting of the CB and VB, 8,9 which introduces non-identical valleys (at k and − k ) in TMDCs. The transitions at these valleys obey chiral selection rules and hence TMDCs possess the electronic valley degree of freedom 6,7 that makes them a promising candidate for valley electronics and opto-spintronics. 8–10 Moreover, TMDCs could find applications in light emitting devices 11 because of strong emission which mainly originates due to recombination of excitons.…”