Envelope of commensurability magnetoresistance oscillation in unidirectional lateral superlattices
Envelope of commensurability magnetoresistance oscillation in unidirectional lateral superlattices
复制标题
单向横向超晶格中可通约磁阻振荡的包络
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Y. Iye
中科院分区：
文献类型：
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作者：
A. Endo;S. Katsumoto;Y. Iye
可公度性磁阻振荡~Weiss振荡的包络！研究了由二维电子气~2DEG！制备的横向超晶格。具有可变迁移率m和间隔层厚度ds的晶片。当2DEG具有足够高的m和足够大的dS时，包络可以用Peeters和Vasilopoulos在一阶微扰理论@Phys中给出的公式很好地描述。版本B 46,4667~1992#对于较小的m或ds，在较低的B时，振荡比公式衰减得更快。衰减可以用形式为@p/(MWB)#/Sinh@p/(MWB)#的附加因子来解释。结果表明，参数Mw与二维粒子的平均自由程L成正比，比例系数随DS的增大而增大。Mw的大小，以及它对DS和电子面密度ns的依赖关系，接近于MQ的大小，MQ的迁移率对应于总散射时间。
The envelope of the commensurability magnetoresistance oscillation ~Weiss oscillation! has been studied for lateral superlattices prepared from two-dimensional electron gas ~2DEG! wafers with varying mobility m and spacer-layer thickness ds . When the 2DEG has a high enough m and a large enough ds , the envelope is well described by the formula given by Peeters and Vasilopoulos in a first-order perturbation theory @Phys. Rev. B 46, 4667 ~1992!.#. For smaller m or ds , the oscillation diminishes faster than the formula at lower B. The damping can be accounted for by an additional factor of the form @p/(mWB)#/sinh@p/(mWB)#. The parameter mW is found to be proportional to the mean free path L of the 2DEG, and the coefficient of proportionality increases with ds . The magnitude of mW , as well as its dependence on ds and the electron areal density ns , is close to that of mQ , the mobility corresponding to the total scattering time.