We investigate the Hall effects of quadratic band crossing(QBC) fermions in a square optical lattice with spin–orbit coupling and orbital Zeeman term. We find that the orbital Zeeman term and shaking play critical ro...We investigate the Hall effects of quadratic band crossing(QBC) fermions in a square optical lattice with spin–orbit coupling and orbital Zeeman term. We find that the orbital Zeeman term and shaking play critical roles in the systems,which can drive a topological transition from spin Hall phases to anomalous Hall phase with nonvanishing(spin) Chern numbers. Due to the interplay among the orbital Zeeman term, spin–orbit coupling, and the shaking, the phase diagram of the system exhibits rich phases, which are characterized by Chern number.展开更多
We study the effect of linearly polarized light on the band structure and longitudinal conductivity in ABC-stacked trilayer graphene.The linearly polarized light can induce a pair of additional points in ABC-stacked t...We study the effect of linearly polarized light on the band structure and longitudinal conductivity in ABC-stacked trilayer graphene.The linearly polarized light can induce a pair of additional points in ABC-stacked trilayer graphene,where conduct and valence bands touch.The locations of these points are determined by the amplitude of the light.Furthermore,the layer pseudospin polarization can be controlled by the light.When the Fermi energy locates at Dirac points,i.e.,E_(f)=0,the longitudinal conductivity shows resonance phenomena when the light is present.Away from the Dirac points,the longitudinal conductivity is unchanged as varying Effor weak light field at larger Fermi energy,and the amplitude of longitudinal conductivity can be controlled by tuning the light field amplitude.Moreover,the effect of linearly polarized light on resonance phenomena in k-cubic Rashba-Dresselhaus system under the irradiating of linearly polarized light is discussed.展开更多
We investigate the photoconductivities of injection current and the shift current in transition metal dichalcogenide with warping term in the presence of sublattice potential and spin orbit coupling.The system shows t...We investigate the photoconductivities of injection current and the shift current in transition metal dichalcogenide with warping term in the presence of sublattice potential and spin orbit coupling.The system shows the valley photoconductivities of injection current and the photoconductivities of shift current.It is found that the warping term and the geometric tensor play a critical role in the system,which are responsible for the photoconductivities.Due to the interplay between the sublattice potential and the spin orbit coupling,the photoconductivities can be tuned.Furthermore,the effect of warping term on geometric tensor and the amplitude of the photoconductivities are also discussed.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 11504095)。
文摘We investigate the Hall effects of quadratic band crossing(QBC) fermions in a square optical lattice with spin–orbit coupling and orbital Zeeman term. We find that the orbital Zeeman term and shaking play critical roles in the systems,which can drive a topological transition from spin Hall phases to anomalous Hall phase with nonvanishing(spin) Chern numbers. Due to the interplay among the orbital Zeeman term, spin–orbit coupling, and the shaking, the phase diagram of the system exhibits rich phases, which are characterized by Chern number.
基金Project supported by the Shandong Provincial Natural Science Foundation(Grant No.ZR2021MA093)。
文摘We study the effect of linearly polarized light on the band structure and longitudinal conductivity in ABC-stacked trilayer graphene.The linearly polarized light can induce a pair of additional points in ABC-stacked trilayer graphene,where conduct and valence bands touch.The locations of these points are determined by the amplitude of the light.Furthermore,the layer pseudospin polarization can be controlled by the light.When the Fermi energy locates at Dirac points,i.e.,E_(f)=0,the longitudinal conductivity shows resonance phenomena when the light is present.Away from the Dirac points,the longitudinal conductivity is unchanged as varying Effor weak light field at larger Fermi energy,and the amplitude of longitudinal conductivity can be controlled by tuning the light field amplitude.Moreover,the effect of linearly polarized light on resonance phenomena in k-cubic Rashba-Dresselhaus system under the irradiating of linearly polarized light is discussed.
基金Project supported by the National Natural Science Foundation of China(Grant No.11504095)the Science and Technology Program for Institutions of Higher Learning in Shandong Province,China(Grant No.J18KA224).
文摘We investigate the photoconductivities of injection current and the shift current in transition metal dichalcogenide with warping term in the presence of sublattice potential and spin orbit coupling.The system shows the valley photoconductivities of injection current and the photoconductivities of shift current.It is found that the warping term and the geometric tensor play a critical role in the system,which are responsible for the photoconductivities.Due to the interplay between the sublattice potential and the spin orbit coupling,the photoconductivities can be tuned.Furthermore,the effect of warping term on geometric tensor and the amplitude of the photoconductivities are also discussed.
