The structural,magnetic properties,and mechanism of magnetization of SnO monolayer doped with 3 d transition metal Mn atom were studied using first-principles calculations.The calculated results show that the substitu...The structural,magnetic properties,and mechanism of magnetization of SnO monolayer doped with 3 d transition metal Mn atom were studied using first-principles calculations.The calculated results show that the substitution doping is easier to realize under the condition of oxygen enrichment.Numerical results reveal that the spin-splitting defect state of the Mn doped system is produced in the band gap and the magnetic moment of 5.0μB is formed.The induced magnetic moment by Mnsubis mostly derived from the 3 d orbital of the doped Mn atom.The magnetic coupling between magnetic moments caused by two Mn atoms in SnO monolayer is a long-range ferromagnetic,which is due to the hole-mediated p–p and p–d interactions.The calculated results suggest that room-temperature ferromagnetism in a SnO monolayer can be induced after substitutional doping of a Mn atom.展开更多
Strong electromagnetic fields produced in the non-central heavy-ion collisions can induce vector meson photoproduction.In this paper,we study the photoproduction J/ψandφmesons in the relativistic heavy-ion collision...Strong electromagnetic fields produced in the non-central heavy-ion collisions can induce vector meson photoproduction.In this paper,we study the photoproduction J/ψandφmesons in the relativistic heavy-ion collision from ultra-peripheral nuclear collisions to peripheral hadronic heavy ion collisions.And then include both initial hadronic production and thermal production in quark-gluon plasma(QGP).We find,for the charm anti-charm bound state J/ψ,the photoproduced J/ψs are mainly in the very low momentum region and clearly exceed the hadronic production.However,considering the thermal production of strange quark anti-quark pairs in QGP produced in relativistic heavy-ion collisions,the photoproducedφis usually smaller than the thermal production and only evident at very peripheral collisions as even their photoproduction is much larger than J/ψ.展开更多
文摘The structural,magnetic properties,and mechanism of magnetization of SnO monolayer doped with 3 d transition metal Mn atom were studied using first-principles calculations.The calculated results show that the substitution doping is easier to realize under the condition of oxygen enrichment.Numerical results reveal that the spin-splitting defect state of the Mn doped system is produced in the band gap and the magnetic moment of 5.0μB is formed.The induced magnetic moment by Mnsubis mostly derived from the 3 d orbital of the doped Mn atom.The magnetic coupling between magnetic moments caused by two Mn atoms in SnO monolayer is a long-range ferromagnetic,which is due to the hole-mediated p–p and p–d interactions.The calculated results suggest that room-temperature ferromagnetism in a SnO monolayer can be induced after substitutional doping of a Mn atom.
文摘Strong electromagnetic fields produced in the non-central heavy-ion collisions can induce vector meson photoproduction.In this paper,we study the photoproduction J/ψandφmesons in the relativistic heavy-ion collision from ultra-peripheral nuclear collisions to peripheral hadronic heavy ion collisions.And then include both initial hadronic production and thermal production in quark-gluon plasma(QGP).We find,for the charm anti-charm bound state J/ψ,the photoproduced J/ψs are mainly in the very low momentum region and clearly exceed the hadronic production.However,considering the thermal production of strange quark anti-quark pairs in QGP produced in relativistic heavy-ion collisions,the photoproducedφis usually smaller than the thermal production and only evident at very peripheral collisions as even their photoproduction is much larger than J/ψ.
