The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms.We report the observation of a novel 2D quantum phase transition between the Mott insulator andπsuperfluid ...The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms.We report the observation of a novel 2D quantum phase transition between the Mott insulator andπsuperfluid in a shaking optical lattice.In the deep optical lattice regime,the lowest S band can be tuned to Mott phase,while the higher P_(x,y)bands are itinerant for having larger bandwidth.Through a shaking technique coupling the s-orbital to p_(x,y)-orbital states,we experimentally observe the transition between the states of the S and P_(x,y)bands,leading to a quantum phase transition from two-dimensional s-orbital Mott phase to the p_(x,y)-orbital superfluid which condensed at(π,π)momentum.Using the band-mapping method,we also observe the changes of atomic population in different energy bands during the transition,and the experimental results are well consistent with theoretical expectations.展开更多
We show theoretically that it is possible to optically control domain formation in a spinor-1^(87)Rb gas.A model is proposed to include the photoassociation(PA)interaction characterizing the symmetry breaking of MF=&#...We show theoretically that it is possible to optically control domain formation in a spinor-1^(87)Rb gas.A model is proposed to include the photoassociation(PA)interaction characterizing the symmetry breaking of MF=±1 ferromagnetic condensate.We find that the dynamical process of the domain formation can be greatly controlled by the PA field.The PA field can enhance or suppress the spatial separation of domains,which can provide a flexible tool to modulate the domain structure and indicate an interesting research field of laser-catalyzed in spinor condensate.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11920101004,11934002)the National Key Research and Development Program of China(Grant Nos.2021YFA1400900,2021YFA0718300)。
文摘The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms.We report the observation of a novel 2D quantum phase transition between the Mott insulator andπsuperfluid in a shaking optical lattice.In the deep optical lattice regime,the lowest S band can be tuned to Mott phase,while the higher P_(x,y)bands are itinerant for having larger bandwidth.Through a shaking technique coupling the s-orbital to p_(x,y)-orbital states,we experimentally observe the transition between the states of the S and P_(x,y)bands,leading to a quantum phase transition from two-dimensional s-orbital Mott phase to the p_(x,y)-orbital superfluid which condensed at(π,π)momentum.Using the band-mapping method,we also observe the changes of atomic population in different energy bands during the transition,and the experimental results are well consistent with theoretical expectations.
基金Supported by the National Natural Science Foundation of China under Grant No 10974045the Program for New Century Excellent Talents in University(NCET)from the Ministry of Educationthe Talented-Youth Project in Henan Province.
文摘We show theoretically that it is possible to optically control domain formation in a spinor-1^(87)Rb gas.A model is proposed to include the photoassociation(PA)interaction characterizing the symmetry breaking of MF=±1 ferromagnetic condensate.We find that the dynamical process of the domain formation can be greatly controlled by the PA field.The PA field can enhance or suppress the spatial separation of domains,which can provide a flexible tool to modulate the domain structure and indicate an interesting research field of laser-catalyzed in spinor condensate.
