论文标题
激子$ g $因素的Ab-Initio研究：单层过渡金属二分法中的磁场
Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
论文作者
论文摘要
已经通过实验测量了磁场对半导体光学吸收的影响，并在过去几十年中为各种系统进行了理论上的建模。我们提出了一种新的第一原理方法，可以系统地确定激子对磁场的响应，即激子$ g $因素。通过利用$ GW $ -Bethe-salpeter方程方法，我们表明，从电子带的Zeeman移位中提取的$ G $因子被多体效应重新归一化，我们将其追溯到互惠空间中激子的程度。我们将我们的方法应用于过渡金属二色源的单层（MOS $ _2 $，MOSE $ _2 $，MOTE $ _2 $，WS $ _2 $和WSE $ _2 $），其$ G $因子削弱了约30％。
The effect of a magnetic field on the optical absorption in semiconductors has been measured experimentally and modeled theoretically for various systems in previous decades. We present a new first-principles approach to systematically determine the response of excitons to magnetic fields, i.e. exciton $g$ factors. By utilizing the $GW$-Bethe-Salpeter equation methodology we show that $g$ factors extracted from the Zeeman shift of electronic bands are strongly renormalized by many-body effects which we trace back to the extent of the excitons in reciprocal space. We apply our approach to monolayers of transition metal dichalcogenides (MoS$_2$, MoSe$_2$, MoTe$_2$, WS$_2$, and WSe$_2$) with strongly bound excitons for which $g$ factors are weakened by about 30%.
