Stabilization of excitons in an intense terahertzelectric field

摘要

When the strength of a terahertz electric ?eld is comparable with that ofthe Coulomb ?eld between an electron and a hole in a semiconductor, the ionizationrate of excitons in this electric field may decrease with increasing the field strength.We predict this excitonic stabilization effect, in contrast to its atomic counterpart, isexperimentally observable, because the exciton can be generated by an additionallyweak near-infrared laser, circumventing the diffculty that substantial ionization hasalready been inevitable during adiabatically driving the atomic ground state into astable dressed state. With a strong magnetic field applied, the excitonic stabilizationcan also be studied in a quasi-one dimensional system, which is expected morepronounced than that in three-dimensional systems.