变形的一维半满t-J⊥-Jz-V模型的量子相图研究.pdfVIP

M缸，2016 2016 年3 月 四川师范大学学报(自然科学版) 第 39 卷第2 期 Joumal of Sichuan Normal University( Natural Science) Vol.39 ,No.2 Quantum Phase Diagram of the One-dimensional Extended t-] Model with Inter-site Coulomb Repulsion and Anisotropic Exchange 1 1 1 LIN E可in ， DING Hanqin , ZHANG Jun ,2 (1. School of Physics Science arul TechTWlogy , XÙ扩昭ng Uniærsity , Urumqi 83∞46 ， Xi即回事; 2. Sta甜 Key μborωoη， of Theoretical Physics , Tnstitute of Theoretical Physics , Chinese Academy of Sciences , Beijing 1ω190) Abstract:A one-dimensional half-filled extended t-Jj_ -J,-V model is studied by the deformed Hubbard opera- tor method in the weak-coupling regime , and the quantum phase diagram is obtained via the bosonization and the renormalization group techniques. The ground state is always dominated in the insulating density-wave phases by in- terplay between inter-site repulsion (V) and anisotropic antiferromagnetic exchange (J止 -J，). The properties of the model is determined by the parameter (V/旷)， =4/霄， where δis a deformation parameter 0 8 运 1. Moreover , when Vis absent , a insulator-metal transition takes place in the system. The result provides an important insight in- to the t-J model and its extended versions. Key words:deformed t-Jj_ -J, -V model; bosonization; deformed Hubbard operator; renormalization group; quantum phase diagram 2010 MSC: 0469