The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the re...The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the real-space Hamiltonian. The calculated results show that the probability of single photon frequency down-or up-conversion can reach a unit by choosing appropriate parameters in the non-dissipative system with perfect chiral coupling.We present a nonreciprocal single photon beam splitter whose frequency of the output photon is different from that of the input photon. The influences of dissipations and non-perfect chiral coupling on the single frequency conversion are also shown. Our results may be useful in designing quantum devices at the single-photon level.展开更多
A new metal-organic network, [Cd(CH_3OH)_2(epa)]_n(1), was synthesized from an achiral coupled cinnamic acid, 3,3?-((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))diacrylic acid(H_2epa), and Cd(NO3)2...A new metal-organic network, [Cd(CH_3OH)_2(epa)]_n(1), was synthesized from an achiral coupled cinnamic acid, 3,3?-((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))diacrylic acid(H_2epa), and Cd(NO3)2·4H2O under solvothermal conditions. The complex crystallizes in orthorhombic, space group P2_12_12 with a = 9.8286(8), b = 21.0004(16), c = 5.5169(4) A, V = 1138.71(15) A3, M_r = 528.81, D_c = 1.542 Mg/cm3, F(000) = 536, Z = 2, the final R = 0.0345 and wR = 0.1101 for 2006 observed reflections(I 〉 2σ(I)). In 1 the epa^(2+) anions alternately bridge the Cd(II) cations to form a one-dimensional(1D) infinite homochiral helical chain of [Cd(epa)]n. The chiral homohelical chains via hydrogen bonds formed a two-dimensional(2D) network. The photoluminescence of 1 was also investigated in solid state at ambient temperature.展开更多
We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity.The quantum states of scattered few photons are solved analytically via a real-space approach,an...We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity.The quantum states of scattered few photons are solved analytically via a real-space approach,and the solution indicates the few-photon reflection and transmission properties.When inputting two photons of equal energy to resonate with the cavity,the propagation characteristics of the two photons will be interesting,which is different from the previous anti-bunching effects with a quantum emitter.More importantly,when the total energy of the two incident photons equals the energy of a nonlinear cavity accommodating two photons,influence of the bound state will become larger to result in disappearance of antibunching effect.However,the bound state has no effect on probability of routing to another waveguide.展开更多
The quantum anomalous Hall effect is characterized by a quantized Hall resistance with a vanishing longitudinal resistance.Many experiments reported the quantization of the Hall resistance,which is always accompanied ...The quantum anomalous Hall effect is characterized by a quantized Hall resistance with a vanishing longitudinal resistance.Many experiments reported the quantization of the Hall resistance,which is always accompanied by a non-vanishing longitudinal resistance that is several k?.Meanwhile,the non-vanishing longitudinal resistance exhibits a universal exponential decay with the increase in magnetic field.We propose that the coupling of chiral edge states,which has not been properly evaluated in the previous theories,can give rise to the non-vanishing longitudinal resistance.The coupling between the chiral edges states along the opposite boundaries can be assisted by magnetic domains or defects inside the sample bulk,which has been already identified in recent experiments.Our theory provides a potential mechanism to understand the experimental result in both magnetic topological insulator and moirésuperlattice systems.展开更多
基金Supported by the Anhui Provincial Natural Science Foundation under Grant No 1608085MA09the National Natural Science Foundation of China under Grant Nos 11774262,61675006,11474003 and 61472282
文摘The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the real-space Hamiltonian. The calculated results show that the probability of single photon frequency down-or up-conversion can reach a unit by choosing appropriate parameters in the non-dissipative system with perfect chiral coupling.We present a nonreciprocal single photon beam splitter whose frequency of the output photon is different from that of the input photon. The influences of dissipations and non-perfect chiral coupling on the single frequency conversion are also shown. Our results may be useful in designing quantum devices at the single-photon level.
基金supported by Scientific and Technological Research Program of Chongqing Municipal Education Commission(No.KJ100602,KJ130638)Program for Innovation Team Building at Institutions of Higher Education in Chongqing(KJTD201309)
文摘A new metal-organic network, [Cd(CH_3OH)_2(epa)]_n(1), was synthesized from an achiral coupled cinnamic acid, 3,3?-((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))diacrylic acid(H_2epa), and Cd(NO3)2·4H2O under solvothermal conditions. The complex crystallizes in orthorhombic, space group P2_12_12 with a = 9.8286(8), b = 21.0004(16), c = 5.5169(4) A, V = 1138.71(15) A3, M_r = 528.81, D_c = 1.542 Mg/cm3, F(000) = 536, Z = 2, the final R = 0.0345 and wR = 0.1101 for 2006 observed reflections(I 〉 2σ(I)). In 1 the epa^(2+) anions alternately bridge the Cd(II) cations to form a one-dimensional(1D) infinite homochiral helical chain of [Cd(epa)]n. The chiral homohelical chains via hydrogen bonds formed a two-dimensional(2D) network. The photoluminescence of 1 was also investigated in solid state at ambient temperature.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11975095,12075082,and 11935006)the Science and Technology Innovation Program of Hunan Province,China(Grant No.2020RC4047)。
文摘We investigate few-photon scattering properties in two one-dimensional waveguides chirally coupled to a nonlinear cavity.The quantum states of scattered few photons are solved analytically via a real-space approach,and the solution indicates the few-photon reflection and transmission properties.When inputting two photons of equal energy to resonate with the cavity,the propagation characteristics of the two photons will be interesting,which is different from the previous anti-bunching effects with a quantum emitter.More importantly,when the total energy of the two incident photons equals the energy of a nonlinear cavity accommodating two photons,influence of the bound state will become larger to result in disappearance of antibunching effect.However,the bound state has no effect on probability of routing to another waveguide.
基金supported by the National Natural Science Foundation of China(Grant Nos.12074108,and 12147102)Natural Science Foundation of Chongqing(Grant No.CSTB2022NSCQ-MSX0568)+4 种基金supported by the National Natural Science Foundation of China(Grant No.12074107)the Program of Outstanding Young and Middle-aged Scientific and Technological Innovation Team of Colleges and Universities in Hubei Province(Grant No.T2020001)the Innovation Group Project of the Natural Science Foundation of Hubei Province of China(Grant No.2022CFA012)supported by the Würzburg-Dresden Cluster of Excellence ct.qmat,EXC2147(Grant No.390858490)the Deutsche Forschungsgemeinschaft(Grant No.SFB 1170)。
文摘The quantum anomalous Hall effect is characterized by a quantized Hall resistance with a vanishing longitudinal resistance.Many experiments reported the quantization of the Hall resistance,which is always accompanied by a non-vanishing longitudinal resistance that is several k?.Meanwhile,the non-vanishing longitudinal resistance exhibits a universal exponential decay with the increase in magnetic field.We propose that the coupling of chiral edge states,which has not been properly evaluated in the previous theories,can give rise to the non-vanishing longitudinal resistance.The coupling between the chiral edges states along the opposite boundaries can be assisted by magnetic domains or defects inside the sample bulk,which has been already identified in recent experiments.Our theory provides a potential mechanism to understand the experimental result in both magnetic topological insulator and moirésuperlattice systems.