2009 Fiscal Year Final Research Report
Optimization variational Monte Carlo study of the crossover between BCS state and Bose-Einstein condensate
| Project/Area Number |
19540356
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
YOKOYAMA Hisatoshi Tohoku University, 大学院・理学研究科, 助教 (60212304)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
OGATA Masao 東京大学, 大学院・理学系研究科, 教授 (60185501)
|
|---|
| Project Period (FY) |
2007 – 2009
|
| Keywords | 超伝導 / BCS / ボース凝縮 / クロスオーバー / 変分モンテカルロ |
|---|
| Research Abstract |
Applying a trial wave function with onsite repulsive and near-neighbor doublon-holon attractive correlation factors to the attractive Hubbard model, we confirmed that the magnitude of the superconducting gap becomes the largest in the intermediate correlation strength. At the same time, the character of superconductivity changes through the crossover region. In the repulsive model as a model of cuprate superconductors, similar crossover is observed as a function of electron density, showing the similarity with the attractive model.
|
