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Equilibrium-reduced density matrix formulation : influence of noise, disorder, and temperature on localization in excitonic systems

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Equilibrium-reduced density matrix formulation : influence of noise, disorder, and temperature on localization in excitonic systems
นักวิจัย : Moix, Jeremy M. , Zhao, Yang , Cao, Jianshu
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Moix, J. M., Zhao, Y., & Cao, J. (2012). Equilibrium-reduced density matrix formulation: Influence of noise, disorder, and temperature on localization in excitonic systems. Physical Review B, 85(11), 115412-. , http://hdl.handle.net/10220/9402 , http://dx.doi.org/10.1103/PhysRevB.85.115412
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

An exact method to compute the entire equilibrium-reduced density matrix for systems characterized by a system-bath Hamiltonian is presented. The approach is based upon a stochastic unraveling of the influence functional that appears in the imaginary time path integral formalism of quantum statistical mechanics. This method is then applied to study the effects of thermal noise, static disorder, and temperature on the coherence length in excitonic systems. As representative examples of biased and unbiased systems, attention is focused on the well-characterized complexes of the Fenna-Matthews-Olson (FMO) protein and the light harvesting complex of purple bacteria, LH2, respectively. Due to the bias, FMO is completely localized in the site basis at low temperatures, whereas LH2 is completely delocalized. In the latter, the presence of static disorder leads to a plateau in the coherence length at low temperature that becomes increasingly pronounced with increasing strength of the disorder. The introduction of noise, however, precludes this effect. In biased systems, it is shown that the environment may increase the coherence length, but only decrease that of unbiased systems. Finally it is emphasized that for typical values of the environmental parameters in light harvesting systems, the system and bath are entangled at equilibrium in the single excitation manifold. That is, the density matrix cannot be described as a product state as is often assumed, even at room temperature. The reduced density matrix of LH2 is shown to be in precise agreement with the steady state limit of previous exact quantum dynamics calculations.

บรรณานุกรม :
Moix, Jeremy M. , Zhao, Yang , Cao, Jianshu . (2555). Equilibrium-reduced density matrix formulation : influence of noise, disorder, and temperature on localization in excitonic systems.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Moix, Jeremy M. , Zhao, Yang , Cao, Jianshu . 2555. "Equilibrium-reduced density matrix formulation : influence of noise, disorder, and temperature on localization in excitonic systems".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Moix, Jeremy M. , Zhao, Yang , Cao, Jianshu . "Equilibrium-reduced density matrix formulation : influence of noise, disorder, and temperature on localization in excitonic systems."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Moix, Jeremy M. , Zhao, Yang , Cao, Jianshu . Equilibrium-reduced density matrix formulation : influence of noise, disorder, and temperature on localization in excitonic systems. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.