This paper presents a new approach for material removal on silicon at atomic and close-to-atomic scale assisted by photons.The corresponding mechanisms are also investigated.The proposed approach consists of two seque...This paper presents a new approach for material removal on silicon at atomic and close-to-atomic scale assisted by photons.The corresponding mechanisms are also investigated.The proposed approach consists of two sequential steps:surface modification and photon irradiation.The back bonds of silicon atoms are first weakened by the chemisorption of chlorine and then broken by photon energy,leading to the desorption of chlorinated silicon.The mechanisms of photon-induced desorption of chlorinated silicon,i.e.,SiCl_(2) and SiCl,are explained by two models:the Menzel-Gomer-Redhead(MGR)and Antoniewicz models.The desorption probability associated with the two models is numerically calculated by solving the Liouville-von Neumann equations for open quantum systems.The calculation accuracy is verified by comparison with the results in literatures in the case of the NO/Pt(111)system.The calculation method is then applied to the cases of SiCl_(2)/Si and SiCl/Si systems.The results show that the value of desorption probability first increases dramatically and then saturates to a stable value within hundreds of femtoseconds after excitation.The desorption probability shows a super-linear dependence on the lifetime of excited states.展开更多
We study the single-photon blockade(1 PB),two-photon blockade(2 PB),and photon-induced tunneling(PIT)effects in a cavity–atom optomechanical system in which a two-level atom is coupled to a single-model cavity field ...We study the single-photon blockade(1 PB),two-photon blockade(2 PB),and photon-induced tunneling(PIT)effects in a cavity–atom optomechanical system in which a two-level atom is coupled to a single-model cavity field via a twophoton interaction.By analyzing the eigenenergy spectrum of the system,we obtain a perfect 1 PB with a high occupancy probability of single-photon excitation,which means that a high-quality and efficient single-photon source can be generated.However,PIT often occurs in many cases when we consider 2 PB in analogy to 1 PB.In addition,we find that a 2 PB region will present in the optomechanical system,which can be proved by calculating the correlation function of the model analytically.展开更多
基金This work was supported by the Science Foundation Ireland(SFI)(No.15/RP/B3208)the National Natural Science Foundation of China(NSFC)(No.52035009)。
文摘This paper presents a new approach for material removal on silicon at atomic and close-to-atomic scale assisted by photons.The corresponding mechanisms are also investigated.The proposed approach consists of two sequential steps:surface modification and photon irradiation.The back bonds of silicon atoms are first weakened by the chemisorption of chlorine and then broken by photon energy,leading to the desorption of chlorinated silicon.The mechanisms of photon-induced desorption of chlorinated silicon,i.e.,SiCl_(2) and SiCl,are explained by two models:the Menzel-Gomer-Redhead(MGR)and Antoniewicz models.The desorption probability associated with the two models is numerically calculated by solving the Liouville-von Neumann equations for open quantum systems.The calculation accuracy is verified by comparison with the results in literatures in the case of the NO/Pt(111)system.The calculation method is then applied to the cases of SiCl_(2)/Si and SiCl/Si systems.The results show that the value of desorption probability first increases dramatically and then saturates to a stable value within hundreds of femtoseconds after excitation.The desorption probability shows a super-linear dependence on the lifetime of excited states.
文摘We study the single-photon blockade(1 PB),two-photon blockade(2 PB),and photon-induced tunneling(PIT)effects in a cavity–atom optomechanical system in which a two-level atom is coupled to a single-model cavity field via a twophoton interaction.By analyzing the eigenenergy spectrum of the system,we obtain a perfect 1 PB with a high occupancy probability of single-photon excitation,which means that a high-quality and efficient single-photon source can be generated.However,PIT often occurs in many cases when we consider 2 PB in analogy to 1 PB.In addition,we find that a 2 PB region will present in the optomechanical system,which can be proved by calculating the correlation function of the model analytically.
