层状金属中的弱非相干磁输运
Weakly incoherent magnetotransport in layered metals
摘要：
在弱非相干极限下，当层间转移积分小于杂质势引起的朗道能级展宽，但层间电子隧穿保持层内动量时，研究了磁场中层状金属的电导率.结果表明，杂质势在这一区域的影响比准二维金属在相干极限下的影响大得多。弱非相干区有几个新的定性特征，没有发现在以前的理论方法。在此范围内，背景层间磁电阻随垂直于导电层的磁场的增加而单调增加。有效电子的平均自由时间是相当短的，比在相干制度，并减少与磁场。这增强了高次谐波在角磁阻振荡中的作用，并增加了丁格尔温度，从而抑制了磁量子振荡。
英文摘要：
We investigate the conductivity in layered metals in magnetic field in the weakly incoherent limit, when the interlayer transfer integral is smaller than the Landau level broadening due to the impurity potential, but the interlayer electron tunnelling conserves the intralayer momentum. It is shown that the impurity potential has much stronger effect in this regime, than in the quasi-2D metals in the coherent limit. The weakly incoherent regime has several new qualitative features, not found in the previous theoretical approaches. The background interlayer magnetoresistance in this regime monotonically grows with increasing of magnetic field perpendicular to the conducting layers. The effective electron mean free time is considerably shorter than in the coherent regime and decreases with magnetic field. This enhances the role of higher harmonics in the angular magnetoresistance oscillations and increases the Dingle temperature, which damps the magnetic quantum oscillations.
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