Slowing down photocarrier relaxation in Dirac semimetal Cd<sub>3</sub>As<sub>2</sub> via Mn doping

Sun, Yue; Meng, Yafei; Dai, Ruihong; Yang, Yunkun; Xu, Yongbing; Zhu, Shining; Shi, Yi; Xiu, Faxian; Wang, Frank

doi:10.1364/ol.44.004103

Cited by 21 publications

(14 citation statements)

References 25 publications

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“…The limited modulation of background carrier concentration induced by electrostatic doping may be the main reason. Employing chemical doping or the combination of both are expected to induce much higher doping concentration and are more likely to show observable impacts on dynamics of photocarriers [20,35].…”

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confidence: 99%

Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering

Wang

et al. 2021

Applied Physics Letters

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Transition metal dichalcogenides (TMDs) are known to support complex excitonic states. Revealing the differences in relaxation dynamics among different excitonic species and elucidating the transition dynamics between them may provide important guidelines for designing TMD-based excitonic devices. Combining photoluminescence (PL) and reflectance contrast measurements with ultrafast pump-probe spectroscopy under cryogenic temperatures, we herein study the relaxation dynamics of neutral and charged excitons in a back-gate-controlled monolayer device. Pump-probe results reveal quite different relaxation dynamics of excitonic states under different interfacial conditions: while neutral excitons experience much longer lifetime than trions in monolayer WS2, the opposite is true in the WS2/h-BN heterostructure. It is found that the insertion of h-BN layer between the TMD monolayer and the substrate has a great influence on the lifetimes of different excitonic states. The h-BN flakes can not only screen the effects of impurities and defects at the interface, but also help establish a non-radiative transition from neutral excitons to trions to be the dominant relaxation pathway, under cryogenic temperature. Our findings highlight the important role interface may play in governing the transient properties of carriers in 2D semiconductors, and may also have implications for designing light-emitting and photo-detecting devices based on TMDs.

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Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering

Wang

et al. 2021

Applied Physics Letters

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“…The composite of a fast femtosecond relaxation coupled with a relatively slow relaxation component is long known to benefit other ultrafast applications as well, such as a saturable absorber. [ 41,42 ] There is no obvious dependence of the carrier lifetime on the ErAs thickness. We think that the lifetime is largely equivalent in the tested GaAs/ErAs/GaAs heterojunction system, and the difference may lie in the quality of the ErAs and ErAs/GaAs interface.…”

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confidence: 99%

1550 nm Compatible Ultrafast Photoconductive Material Based on a GaAs/ErAs/GaAs Heterostructure

Zhang

Ren

et al. 2021

Advanced Optical Materials

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The sub‐bandgap absorption and ultrafast relaxation in a GaAs/ErAs/GaAs heterostructure are reported. The infrared absorption and 1550 nm‐excited ultrafast photo‐response are studied by Fourier transform infrared spectrometry and time‐domain pump–probe technique. The two absorption peaks located at 2.0 (0.62 eV) and 2.7 µm (0.45 eV) are originated from the ErAs/GaAs interfacial Schottky states and the ErAs itself, respectively. The photo‐excited carrier lifetime, excited using 1550 nm light, is measured to be as low as 190 fs for the GaAs/ErAs/GaAs heterostructure, making it a promising material for 1550‐nm‐technology‐compatible, high critical‐breakdown‐field THz devices. The relaxation mechanism is proposed and the functionality of ErAs is revealed.

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“…The composite of a fast femtosecond relaxation coupled with a relatively slow relaxation component is long known to benefit other ultrafast applications as well, such as a saturable absorber. [33][34] There is no obvious dependence of the carrier relaxation time on the ErAs thickness, probably because the available ErAs VB states for carrier capture is high enough and not being saturated for these thick ErAs films. More systemetic studies on thinner ErAs insertion can further reveal the relaxation mechanisms, but it is out of the scope this work.…”

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confidence: 99%

Introduction to the Department of Cardiology in Nanjing First Hospital of Nanjing Medical University, China

Zhang

Chen

2020

European Heart Journal

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Reclosure of ruptured incision after peroral endoscopic myotomy using endoloops and metallic clipsSince Inoue et al. introduced peroral endoscopic myotomy (POEM) into a clinic to treat esophageal achalasia in 2010, the procedure has been carried out in many countries around the world. 1 As more and more POEM is being done, associated technical difficulties and complications may occur. 2 To our knowledge, the present study is the first to report incision rupture after POEM.A 37-year-old man presented to our academic center after experiencing 25 years of dysphagia and 2 months of exacerbation. Barium swallow examination and esophageal manometry diagnosed the patient with type I esophageal achalasia and he agreed to receive POEM.POEM was carried out using the standard technique. After the operation, the patient received routine postoperative care. On the third day after the procedure, the patient had a fever (38.9°C, white blood cell count 18.24 × 10 9 /L, % neutrophils 95.3%) and X-ray showed the absence of several metal clips at the proximal end of the longitudinal incision which revealed the incision rupture.Gastroesophageal endoscopy showed that the middle and proximal parts of the incision was ruptured. It was not possible to reclose the incision with routine clips because of the swollen mucosa around the defect. On endoscopy, an endoloop was inserted and snared the remaining clips in the distal part. In the middle, four clips were anchored onto the defect margins at full thickness and another endoloop was inserted to snare the clips tightly. The same procedure was done in the proximal part (Figs 1,2). After monitoring the patient's condition for several days, he was discharged without any complaints or complications.In the present study, we propose reclosure of a mucosal incision after POEM using conventional endoloops and hemostatic clips. It could reclose the incision regardless of the swollen tissue or the size of the longitudinal incision.

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Slowing down photocarrier relaxation in Dirac semimetal Cd₃As₂ via Mn doping

Cited by 21 publications

References 25 publications

Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering

Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering

1550 nm Compatible Ultrafast Photoconductive Material Based on a GaAs/ErAs/GaAs Heterostructure

Introduction to the Department of Cardiology in Nanjing First Hospital of Nanjing Medical University, China

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Slowing down photocarrier relaxation in Dirac semimetal Cd3As2 via Mn doping

Cited by 21 publications

References 25 publications

Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering

Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering

1550 nm Compatible Ultrafast Photoconductive Material Based on a GaAs/ErAs/GaAs Heterostructure

Introduction to the Department of Cardiology in Nanjing First Hospital of Nanjing Medical University, China

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Slowing down photocarrier relaxation in Dirac semimetal Cd₃As₂ via Mn doping