Superconductivity near the(2+1)-Dimensional Ferromagnetic Quantum Critical Point

郝云超; 潘高培; 孙锴; 孟子杨; 戚扬

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Superconductivity near the(2+1)-Dimensional Ferromagnetic Quantum Critical Point

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摘要

We utilize both analytical and numerical methods to study the superconducting transition temperature Tnear a fermionic quantum critical point(QCP) using a model constructed by Xu et al. [Phys. Rev. X 7, 031059(2017)] as an example. In this model, the bosonic critical fluctuation plays the role of pairing glue for the Cooper pairs, and we use a Bardeen–Cooper–Schrieffer-type mean-field theory to estimate T. We further argue that the Tc computed from the BCS theory approximates a pseudogap temperature TPG, instead of the Berezinskii–Kosterlitz–Thouless transition temperature T, which is confirmed by our determinant quantum Monte Carlo simulation. Moreover, due to the fact that electron density of state starts to deplete at T, the critical scaling of the underlying QCP is also affected below TPG. Thus, when studying the critical behavior of fermionic QCPs, we need to monitor that the temperature is above TPG instead of T. This was often ignored in previous studies.

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来源
《中国物理快报：英文版》 |2022年第9期|47-52|共6页
作者
郝云超; 潘高培; 孙锴; 孟子杨; 戚扬;
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作者单位

State Key Laboratory of Surface Physics and Department of Physics;

Fudan University;

Shanghai 200433;

China;

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics;

Chinese Academy of Sciences;

Beijing 100190;

China;

School of Physical Sciences;

University of Chinese Academy of Sciences;

Beijing 100190;

China;

Department of Physics;

University of Michigan;

Ann Arbor;

MI 48109;

USA;

Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics;

The University of Hong Kong;

Pokfulam Road;

Hong Kong;

China;

Collaborative Innovation Center of Advanced Microstructures;

Nanjing 210093;

China;

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原文格式 PDF
正文语种 chi
中图分类凝聚态物理学;
关键词
critical; quantum; utilize;

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Superconductivity near the(2+1)-Dimensional Ferromagnetic Quantum Critical Point

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