Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
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DOI：
10.1103/physrevlett.121.057402
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发表时间：
2018-08-02
影响因子：
8.6
通讯作者：
Korn, Tobias
中科院分区：
文献类型：
--
作者：
Nagler, Philipp;Ballottin, Mariana V.;Korn, Tobias
原子薄的半导体提供了一个理想的实验平台来研究库仑束缚多体态的物理。我们揭示了这种复杂的结构，通过研究磁场诱导分裂的双激子在单层WS 2使用偏振分辨光致发光光谱在面外磁场高达30 T。所观察到的双激子的g因子约为-3.9，与中性激子的g因子密切匹配。双激子发射在线性偏振激发时显示出反转的圆场诱导的偏振;即，它在磁场中表现出从高能峰的优先发射。这种现象的解释考虑到混合配置的双激子成分在动量空间和它们各自的能量在磁场中的行为。我们的研究结果揭示了暗激子在这种多体状态的组成中的关键作用。
Atomically thin semiconductors provide an ideal testbed to investigate the physics of Coulomb-bound many-body states. We shed light on the intricate structure of such complexes by studying the magnetic-field-induced splitting of biexcitons in monolayer WS2 using polarization-resolved photoluminescence spectroscopy in out-of-plane magnetic fields up to 30 T. The observed g factor of the biexciton amounts to about -3.9, closely matching the g factor of the neutral exciton. The biexciton emission shows an inverted circular field-induced polarization upon linearly polarized excitation; i.e., it exhibits preferential emission from the high-energy peak in a magnetic field. This phenomenon is explained by taking into account the hybrid configuration of the biexciton constituents in momentum space and their respective energetic behavior in magnetic fields. Our findings reveal the critical role of dark excitons in the composition of this many-body state.