We analytically and numerically investigate the dynamical properties of the tilted dispersion relativistic quasiparticles emerged in a cold atomic optical lattice system.By introducing the next nearest neighboring(NNN...We analytically and numerically investigate the dynamical properties of the tilted dispersion relativistic quasiparticles emerged in a cold atomic optical lattice system.By introducing the next nearest neighboring(NNN)hopping term into Su-Schrieffer-Heeger(SSH)model,the Dirac quasiparticles with tilted dispersion relation are realized.The results show that the tilted dispersion causes a drift in relativistic quasiparticles rather than affecting interference behavior between inner states.To be specific,the relativistic phenomena of the quasiparticles induced by the inner state interference(such as Zitterbewegung,Klein paradox,etc.)is completely unaffected by the tilted dispersion.In order to distinguish the drift induced by tilted dispersion and common initial velocity,we calculate the momentum distribution of the relativistic quasiparticles.We obtain the difference between the drift induced by initial velocity and tilted dispersion.The former affects the ZB,while the latter does not.By using this character,we propose a quench dynamics scheme to obtain a stable mono-spin state.The proposed cold atomic lattice system would provide a promising platform in exploring the intrinsic exotic physics of relativistic quasiparticles and the related systems.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0301803 and 2016YFA0302800)the National Natural Science Foundation of China(Grant Nos.11604103,11704132,11822403,and 91636218),the NSAF,China(Grant Nos.U1801661 and U1830111)+4 种基金the PCSIRT,China(Grant No.IRT1243)the Natural Science Foundation of Guangdong Province,China(Grant Nos.2016A030313436,2018A030313322,and 2018A0303130066)the KPST of Guangzhou(Grant No.201804020055)China Postdoctoral Science Foundation(Grant No.2018M633063)the Startup Foundation of SCNU.
文摘We analytically and numerically investigate the dynamical properties of the tilted dispersion relativistic quasiparticles emerged in a cold atomic optical lattice system.By introducing the next nearest neighboring(NNN)hopping term into Su-Schrieffer-Heeger(SSH)model,the Dirac quasiparticles with tilted dispersion relation are realized.The results show that the tilted dispersion causes a drift in relativistic quasiparticles rather than affecting interference behavior between inner states.To be specific,the relativistic phenomena of the quasiparticles induced by the inner state interference(such as Zitterbewegung,Klein paradox,etc.)is completely unaffected by the tilted dispersion.In order to distinguish the drift induced by tilted dispersion and common initial velocity,we calculate the momentum distribution of the relativistic quasiparticles.We obtain the difference between the drift induced by initial velocity and tilted dispersion.The former affects the ZB,while the latter does not.By using this character,we propose a quench dynamics scheme to obtain a stable mono-spin state.The proposed cold atomic lattice system would provide a promising platform in exploring the intrinsic exotic physics of relativistic quasiparticles and the related systems.
