It is the main purpose of this paper to calculate the energy splitting of ground state and excited states induced by thermally assisted quantum tunneling . first , a brief introduction is given for the theoretical and experimental studies on the magnetic macroscopic quantum effects . then , spin tunneling in a uniaxial ferromagnetic particle in transverse magnetic field is converted to a pseudoparticle moving in effective double - well potential with the help of the effective potential description of quantum spin systems developed by ulyanov and zaslavskii . finally using the periodic instanton method we evaluate the transition amplitude , energy shift and prefactor of wkb exponential and the energy splitting of ground state and the tunneling rate for excited states induced by thermally assisted quantum tunneling are obtained 文章首先对磁性宏观量子效应的理论和实验方面作了简单介绍,然后借助于ulyanov和zaslavskii发展的一种等效势描述方法,把外磁场沿难磁化轴方向时的自旋隧穿约化成在等效双势阱中运动的粒子,利用瞬子方法给出基态能级劈裂,最后利用周期瞬子方法分别计算了隧穿幅、能级移动以及wkb前因子,从而给出由于热助量子隧穿引起的激发态的隧穿率。
能级: energy level移动: shift; move超级移动电脑: ultra-mobile pc超级移动计算机: umpc高级移动电话系统: amps advanced mobile phone system高级移动电话业务: advanced mobile phone service amps; andvanced mobile phone service国家级移动站标识: nsi national mobile station identity高级移动电话系统(美): advanced mobile phone system amps数字-高级移动电话服务: d-amps数字高级移动电话系统: damps digital adanced mobile phone system数字化高级移动电话系统: d-amps数字化高级移动电话业务: digital amps数字式高级移动电话系统: damps digital advanced mobile phone system窄带高级移动电话服务: namps narrowband advanced mobile phone service窄带高级移动电话系统: namps ( narrowband advanced mobile phone system )数字式高级移动电话服务系统(爱立信的): d-amps digital advanced mobile phone service能级: [物理学] energy level 费密能级 fermi level; 基态能级 ground state level 多级移相器: mph multiple phaserk能级: k levell能级: l level; l-level磁能级: magnetic energy level; magnetic level次能级: sub level; sublevel低能级: l-level; low level; low-lying level多能级: multiple level高能级: high level; high-level; upper level