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Accuracy of second order perturbation theory in the polaron and variational polaron frames

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Accuracy of second order perturbation theory in the polaron and variational polaron frames
นักวิจัย : Lee, Chee Kong , Moix, Jeremy , Cao, Jianshu
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Lee, C. K., Moix, J., & Cao, J. (2012). Accuracy of second order perturbation theory in the polaron and variational polaron frames. The Journal of Chemical Physics, 136(20), 204120-. , 0021-9606 , http://hdl.handle.net/10220/9179 , http://dx.doi.org/10.1063/1.4722336
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : The journal of chemical physics
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

In the study of open quantum systems, the polaron transformation has recently attracted a renewed interest as it offers the possibility to explore the strong system-bath coupling regime. Despite this interest, a clear and unambiguous analysis of the regimes of validity of the polaron transformation is still lacking. Here we provide such a benchmark, comparing second order perturbation theory results in the original untransformed frame, the polaron frame, and the variational extension with numerically exact path integral calculations of the equilibrium reduced density matrix. Equilibrium quantities allow a direct comparison of the three methods without invoking any further approximations as is usually required in deriving master equations. It is found that the second order results in the original frame are accurate for weak system-bath coupling; the results deteriorate when the bath cut-off frequency decreases. The full polaron results are accurate for the entire range of coupling for a fast bath but only in the strong coupling regime for a slow bath. The variational method is capable of interpolating between these two methods and is valid over a much broader range of parameters.

บรรณานุกรม :
Lee, Chee Kong , Moix, Jeremy , Cao, Jianshu . (2555). Accuracy of second order perturbation theory in the polaron and variational polaron frames.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lee, Chee Kong , Moix, Jeremy , Cao, Jianshu . 2555. "Accuracy of second order perturbation theory in the polaron and variational polaron frames".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lee, Chee Kong , Moix, Jeremy , Cao, Jianshu . "Accuracy of second order perturbation theory in the polaron and variational polaron frames."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Lee, Chee Kong , Moix, Jeremy , Cao, Jianshu . Accuracy of second order perturbation theory in the polaron and variational polaron frames. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.