In monolayer MoS2, optical transitions across the direct band gap are governed by chiral selection rules, allowing optical valley initialization. In time-resolved photoluminescence (PL) experiments, we find that both the polarization and emission dynamics do not change from 4 to 300 K within our time resolution. We measure a high polarization and show that under pulsed excitation the emission polarization significantly decreases with increasing laser power. We find a fast exciton emission decay time on the order of 4 ps. The absence of a clear PL polarization decay within our time resolution suggests that the initially injected polarization dominates the steady-state PL polarization. The observed decrease of the initial polarization with increasing pump photon energy hints at a possible ultrafast intervalley relaxation beyond the experimental ps time resolution. By compensating the temperature-induced change in band gap energy with the excitation laser energy, an emission polarization of 40% is recovered at 300 K, close to the maximum emission polarization for this sample at 4 K.
机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Cao, Ting
;
Wang, Gang
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Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Wang, Gang
;
Han, Wenpeng
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Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Han, Wenpeng
;
Ye, Huiqi
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Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Ye, Huiqi
;
Zhu, Chuanrui
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Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Zhu, Chuanrui
;
Shi, Junren
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Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Shi, Junren
;
Niu, Qian
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机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Univ Texas Austin, Dept Phys, Austin, TX USAPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Niu, Qian
;
Tan, Pingheng
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机构:
Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Tan, Pingheng
;
Wang, Enge
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机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Wang, Enge
;
Liu, Baoli
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机构:
Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Liu, Baoli
;
Feng, Ji
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机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Cao, Ting
;
Wang, Gang
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h-index: 0
机构:
Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Wang, Gang
;
Han, Wenpeng
论文数: 0引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Han, Wenpeng
;
Ye, Huiqi
论文数: 0引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Ye, Huiqi
;
Zhu, Chuanrui
论文数: 0引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Zhu, Chuanrui
;
Shi, Junren
论文数: 0引用数: 0
h-index: 0
机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Shi, Junren
;
Niu, Qian
论文数: 0引用数: 0
h-index: 0
机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Univ Texas Austin, Dept Phys, Austin, TX USAPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Niu, Qian
;
Tan, Pingheng
论文数: 0引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Tan, Pingheng
;
Wang, Enge
论文数: 0引用数: 0
h-index: 0
机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Wang, Enge
;
Liu, Baoli
论文数: 0引用数: 0
h-index: 0
机构:
Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
Liu, Baoli
;
Feng, Ji
论文数: 0引用数: 0
h-index: 0
机构:
Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R ChinaPeking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China