Fig. 3
Anomalous behavior of the \(1s\) exciton state in monolayer MoS\({}_{2}\). a–d Normalized transmission spectra in the vicinity of the ground state (A:\(1s\)) exciton, in four different hBN-encapsulated monolayer MoS\({}_{2}\) structures. Black curves show spectra at \(B\)=0 T, blue and red curves show the \({\sigma }^{+}\) and \({\sigma }^{-}\) spectra acquired at large negative and positive \(B\), respectively. Note the field-induced broadening of the higher energy Zeeman state in all cases. e The valley Zeeman splitting of the \(ns\) exciton states for samples 1 and 2; dashed lines show linear fits. The \(1s\) state exhibits an unexpectedly small valley Zeeman splitting in comparison with the excited Rydberg states
