Abstract

This thesis studies light-matter interactions in strong and weak coupling regimes. In the first part, it studies the formation and propagation of exciton-polariton condensates in different microcavities in the strong coupling regime, including propagation and revival of an initially localized condensate in a kagome lattice and transitions between two lowest-energy condensate states under pulsed and continuous-wave excitation. In the second part, it studies valley selection rules for optical transitions from impurity states to the conduction band in two-dimensional Dirac materials, taking monolayer MoS₂ as an example, and calculates the light absorption coefficients and photon-drag electric current density due to impurity-band transitions.

Abstract

This thesis studies light-matter interactions in strong and weak coupling regimes. In the first part, it studies the formation and propagation of exciton-polariton condensates in different microcavities in the strong coupling regime, including propagation and revival of an initially localized condensate in a kagome lattice and transitions between two lowest-energy condensate states under pulsed and continuous-wave excitation. In the second part, it studies valley selection rules for optical transitions from impurity states to the conduction band in two-dimensional Dirac materials, taking monolayer MoS₂ as an example, and calculates the light absorption coefficients and photon-drag electric current density due to impurity-band transitions.

Abstract

This thesis studies light-matter interactions in strong and weak coupling regimes. In the first part, it studies the formation and propagation of exciton-polariton condensates in different microcavities in the strong coupling regime, including propagation and revival of an initially localized condensate in a kagome lattice and transitions between two lowest-energy condensate states under pulsed and continuous-wave excitation. In the second part, it studies valley selection rules for optical transitions from impurity states to the conduction band in two-dimensional Dirac materials, taking monolayer MoS₂ as an example, and calculates the light absorption coefficients and photon-drag electric current density due to impurity-band transitions.

Abstract

This thesis studies light-matter interactions in strong and weak coupling regimes. In the first part, it studies the formation and propagation of exciton-polariton condensates in different microcavities in the strong coupling regime, including propagation and revival of an initially localized condensate in a kagome lattice and transitions between two lowest-energy condensate states under pulsed and continuous-wave excitation. In the second part, it studies valley selection rules for optical transitions from impurity states to the conduction band in two-dimensional Dirac materials, taking monolayer MoS₂ as an example, and calculates the light absorption coefficients and photon-drag electric current density due to impurity-band transitions.