The dominance of surfaces and interfaces: A view to magnetoconductance and structure in low‐dimensional crystalline films
The dominance of surfaces and interfaces: A view to magnetoconductance and structure in low‐dimensional crystalline films
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表面和界面的主导地位：低维晶体薄膜中的磁导和结构的观点
DOI：
10.1002/pssa.201127751
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
C. Tegenkamp
中科院分区：
文献类型：
--
作者：
H. Pfnür;D. Lükermann;C. Tegenkamp
对于超薄膜，表面和界面处的电子输运性质由界面处的电子散射主导。因此，正如我们在Si（557）上的Pb的例子所示，直流输运对限制、生长模式和（电子）表面粗糙度敏感。在Pb在Si（557）上生长超过10个单层的过程中，我们发现了经典和量子尺寸效应，显著的电导各向异性和电导振荡与Pb膜在这个规则台阶表面上的各向异性逐层生长模式直接相关。事实上，事实证明，界面各向异性，它延伸到第七层的电导，保持作为记忆效应，即使厚（各向同性）层。通过外加磁场，可以分离出弹性、非弹性和自旋轨道散射的贡献，从而揭示出杂质和缺陷处散射机制的细节。从多层膜到单层膜，散射性质的强烈变化是明显的，这一点在Pb on Si（557）系统中再次得到证实。与多层膜相反，自旋-轨道散射在单层膜中占主导地位，这可能是由于表面的对称性降低和Rashba效应分裂的自旋分裂带的出现。此外，接近单层完成的自旋轨道散射的异常，加上准一维直流电导，可以归因于Rashba效应。通过对Bi在Si（111）上多层生长的研究，说明了体电导和表面电导之间的有趣相互作用以及表面处的大Rashba分裂态。通过磁导，我们能够从表面贡献中分离出体积。强自旋极化的Rashba分裂态自旋之间的散射可以被有效地抑制，因此只有“经典”磁导效应仍然存在，如在该系统中观察到的。
For ultra‐thin films, electronic transport properties at surfaces and interfaces are dominated by electronic scattering at the interfaces. Therefore, as our example with Pb on Si(557) shows, d.c. transport is sensitive to confinement, to growth modes, and to (electronic) surface roughness. During the growth of Pb on Si(557) up to more than 10 monolayers, we found classical and quantum size effects, a pronounced conductance anisotropy and conductance oscillations directly related to the anisotropic layer‐by‐layer growth mode of the Pb film on this regularly stepped surface. In fact, it turned out that the interface anisotropy, which extends up to the seventh layer in conductance, is kept as a memory effect even for thick (isotropic) layers. By adding a magnetic field, details of the scattering mechanism at impurities and defects are revealed, since elastic, inelastic, spin–orbit scattering contributions can be separated.Strong changes of scattering properties are evident when going from the multilayers to the monolayer, as demonstrated again for the system Pb on Si(557). Contrary to multilayers, spin–orbit scattering dominates for the monolayer, presumably due to the symmetry reduction at the surface and the appearance of spin‐split bands split by the Rashba effect. Also the anomaly in spin–orbit scattering close to monolayer completion, coupled with quasi one‐dimensional d.c. conductance, can be ascribed to the Rashba effect. The intriguing interplay between bulk and surface conductance with large Rashba split states at the surface is exemplified by a study of multilayer growth of Bi on Si(111). By magnetoconductance we were able to separate bulk from surface contributions. Scattering between strongly spin‐polarized Rashba‐split states spin can be effectively suppressed, so that only the “classical” magnetoconductance effect remains, as observed in this system.
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影响因子：
8.6
作者：
Crain, JN;Kirakosian, A;Himpsel, FJ
通讯作者：
Himpsel, FJ
影响因子：
1.7
作者：
F. Komori;Shun-ichi Kobayachi;W. Sasaki
通讯作者：
F. Komori;Shun-ichi Kobayachi;W. Sasaki
一维和二维之间的切换：Si(557) 上 Pb 诱导的链结构的电导率。
影响因子：
8.6
作者：
C. Tegenkamp;Z. Kallassy;H. Pfnür;H. Günter;V. Zielasek;M. Henzler
通讯作者：
M. Henzler
DOI：
10.1103/physrevb.42.6906
发表时间：
1990-10
期刊：
Physical review. B, Condensed matter
影响因子：
--
作者：
Calecki
通讯作者：
Calecki
Si(111) 表面超薄外延 Pb 薄膜中的电子传输
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
O. Pfennigstorf;K. Lang;H. Günter;M. Henzler
通讯作者：
M. Henzler