报告题目: |
铁基超导体的磁性，超导配对态和多轨道特性 |
报告人: |
姚道新 |
|
浙大物理系学士和硕士；美国波士顿大学物理系博士毕业；美国普度大学物理系博士后
|
报告时间: |
2009-05-25 14:30 |
报告地点: |
物理系三楼报告厅 |
主办单位: |
物理系 |
简介: |
Abstract: In this seminar, I will give a brief review about the Iron-based
superconductors. Then we study the magnetism of parent components. Through
the Heisenberg models, we estimate the exchange couplings from experimental
data. We notice that the interlayer couplings in XFe2As2 (X=Sr, Ca, Ba )
materials are rather large (3D), and the systems are very anisotropic
within the iron ab-plane in the low temperature orthombic phase. I will also
talk about the possible superconducting states and how to use Josephson
junctions to distinguish them in the iron-based superconductors. In
addition, we propose a novel trilayer Pi-junction as a possible signature of
the sign-reversed s-wave. After that, I will discuss the multi-orbital
models and their connections with experiments (ARPES, STM, etc.). If time
allows, I would talk about a proposed graphene-based nanomechanical cooling
device. |
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