InO $_x$中反常金属相的回旋共振缺失
Absence of cyclotron resonance in the anomalous metallic phase in InO$_x$
摘要：
观察到许多无序度不太高的超导薄膜（一般为R $_N/\Box \leq 2000 Ω$）置于磁场中时，会出现反常的金属相，其电阻很低，但当温度降到零时，电阻仍然是有限的。在这里，我们报告在弱无序的非晶InO $_x$薄膜，这种“玻色金属”的金属相具有没有回旋共振，因此非德鲁德电动力学。它的微波动态电导率显示了整个异常区域中剩余的短程超导关联和强相位波动的特征。有限频率共振模式的缺乏可能与平行于超电流的涡流下游分量的消失以及这种异常金属出现的粒子-空穴对称性有关，这确立了其非费米液体特征。
英文摘要：
It is observed that many thin superconducting films with not too high disorder level (generally R$_N/\Box \leq 2000 Ω$) placed in magnetic field show an anomalous metallic phase where the resistance is low but still finite as temperature goes to zero. Here we report in weakly disordered amorphous InO$_x$ thin films, that this "Bose metal" metal phase possesses no cyclotron resonance and hence non-Drude electrodynamics. Its microwave dynamical conductivity shows signatures of remaining short-range superconducting correlations and strong phase fluctuations through the whole anomalous regime. The absence of a finite frequency resonant mode can be associated with a vanishing downstream component of the vortex current parallel to the supercurrent and an emergent particle-hole symmetry of this anomalous metal, which establishes its non-Fermi liquid character.
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