论文标题
nambu-goldstone模式在费米子超级流体接触中的作用
Role of Nambu-Goldstone modes in the fermionic superfluid point contact
论文作者
论文摘要
在电荷中性的费米子超流体中，由于自发对称性破裂而出现了Nambu-Goldstone（NG）模式，也称为Anderson-Bogoliubov模式。在这里，我们通过量子点接触讨论此类NG模式的DC传输属性。我们表明，与天真的观点相反，相反的观点是，相位刚度的增强可能抑制NG模式的运输，必须有一个异常的贡献，可以在低温下生存。该贡献源自冷凝水和NG模式之间的转换过程。我们发现，在BCS方案中，随着通道的透射和吸引人的相互作用，异常贡献得到了增强，并导致依赖温度的洛伦兹数，并且在当前噪声中没有束效应。
In fermionic superfluids that are charge neutral, Nambu-Goldstone (NG) modes also known as Anderson-Bogoliubov modes emerge as a result of spontaneous symmetry breaking. Here, we discuss DC transport properties of such NG modes through a quantum point contact. We show that contrary to a naive view that enhancement of the phase stiffness may suppress transport of the NG modes, there must be an anomalous contribution that survives at low temperature. This contribution originates from the conversion process between the condensate and NG mode. We find that within the BCS regime the anomalous contribution is enhanced with increasing channel transmittance and attractive interaction, and leads to a temperature-dependent Lorenz number and absence of the bunching effect in current noise.
