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Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy
นักวิจัย : Zhang, Q. , Zhang, J. , Utama, M. I. B. , Peng, B. , Mata, Maria de la , Arbiol, Jordi , Xiong, Qihua
คำค้น : DRNTU::Science::Physics.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Zhang, Q., Zhang, J., Utama, M. I. B., Peng, B., Mata, M. d. l., Arbiol, J., et al. (2012). Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy. Physical Review B, 85(8), 085418-. , http://hdl.handle.net/10220/9251 , http://dx.doi.org/10.1103/PhysRevB.85.085418
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The exciton-phonon coupling in high-quality cubic phase zinc telluride (ZnTe) nanorods (NRs) is investigated by resonant micro-Raman spectroscopy near the direct bandgap of ZnTe. The scattering cross section of longitudinal optical (LO) phonon is enhanced significantly in the resonant process, where the enhancement factor of LO modes is much higher than that of the transverse optical (TO) modes, indicating a dominant Fröhlich electron-phonon interaction mechanism. Up to fifth-order LO phonons are observed by resonant Raman scattering at room temperature. The Huang-Rhys factor of individual NRs—and thus the exciton-LO coupling strengths—is evaluated, showing increasing with the NR diameter. Surface optical (SO) phonon and its high-order overtones are observed between nLO and (n − 1)LO + TO for the first time, whose positions are consistent with a dielectric continuum model. Strong acoustic phonon-exciton coupling induces a high-frequency shoulder above each nLO peaks with two maxima located around 14 cm−1 and 32 cm−1, which are assigned to transverse acoustic and longitudinal acoustic phonons, respectively. The resonant multiphonon scattering process involving acoustic and LO phonons is discussed based on an exciton-intermediated cascade model, where a scattering sequence of acoustic phonon followed by LO phonons is favorable. These results advance the understanding of electron-phonon coupling and exciton scattering in quasi-one-dimensional systems, especially in the scarcely documented ZnTe compound, facilitating the development and optimization of NR-based optoelectronic devices.

บรรณานุกรม :
Zhang, Q. , Zhang, J. , Utama, M. I. B. , Peng, B. , Mata, Maria de la , Arbiol, Jordi , Xiong, Qihua . (2555). Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Zhang, Q. , Zhang, J. , Utama, M. I. B. , Peng, B. , Mata, Maria de la , Arbiol, Jordi , Xiong, Qihua . 2555. "Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Zhang, Q. , Zhang, J. , Utama, M. I. B. , Peng, B. , Mata, Maria de la , Arbiol, Jordi , Xiong, Qihua . "Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Zhang, Q. , Zhang, J. , Utama, M. I. B. , Peng, B. , Mata, Maria de la , Arbiol, Jordi , Xiong, Qihua . Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.