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Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties

หน่วยงาน Nanyang Technological University, Singapore

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ชื่อเรื่อง : Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties
นักวิจัย : Lü, Zhiguo , Duan, Liwei , Li, Xin , Shenai, Prathamesh M. , Zhao, Yang
คำค้น : DRNTU::Science::Chemistry::Physical chemistry.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2556
อ้างอิง : Lü, Z., Duan, L., Li, X., Shenai, P. M., & Zhao, Y. (2013). Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties. The journal of chemical physics, 139(16), 164103-. , 0021-9606 , http://hdl.handle.net/10220/18408 , http://dx.doi.org/10.1063/1.4825205 , 179407
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : The journal of chemical physics
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

We have carried out analytical and numerical studies of the spin-boson model in the sub-ohmic regime with the influence of both the diagonal and the off-diagonal coupling accounted for, via the Davydov D1 variational ansatz. While a second-order phase transition is known to be exhibited by this model in the presence of diagonal coupling only, we demonstrate the emergence of a discontinuous first order phase transition upon incorporation of the off-diagonal coupling. A plot of the ground state energy versus magnetization highlights the discontinuous nature of the transition between the isotropic (zero magnetization) state and nematic (finite magnetization) phases. We have also calculated the entanglement entropy and a discontinuity found at a critical coupling strength further supports the discontinuous crossover in the spin-boson model in the presence of off-diagonal coupling. It is further revealed via a canonical transformation approach that for the special case of identical exponents for the spectral densities of the diagonal and the off-diagonal coupling, there exists a continuous crossover from a single localized phase to doubly degenerate localized phase with differing magnetizations.

บรรณานุกรม :
Lü, Zhiguo , Duan, Liwei , Li, Xin , Shenai, Prathamesh M. , Zhao, Yang . (2556). Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lü, Zhiguo , Duan, Liwei , Li, Xin , Shenai, Prathamesh M. , Zhao, Yang . 2556. "Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lü, Zhiguo , Duan, Liwei , Li, Xin , Shenai, Prathamesh M. , Zhao, Yang . "Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print.
Lü, Zhiguo , Duan, Liwei , Li, Xin , Shenai, Prathamesh M. , Zhao, Yang . Sub-Ohmic spin-boson model with off-diagonal coupling : ground state properties. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.