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arXiv 1107.3896cond-mat.mes-hall
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具有层错阵列的条状银薄膜的一维表面态

One-dimensional surface states on a striped Ag thin film with stacking fault arrays

Takashi Uchihashi, Puneet Mishra, Katsuyoshi Kobayashi, Tomonobu Nakayama

摘要:

通过在Ag薄膜中引入层错阵列,形成了周期为1.3 nm的一维(1D)条形结构。用低温扫描隧道显微镜研究了这种条状Ag薄膜的表面态。通过微分电导(dI/dV)测量观察到纵向运行的驻波和特征光谱峰,揭示了表面条纹上存在1D态。它们的形成可以归因于Ag(111)表面态通过堆垛层错被量子限制成条带。为了定量限制的程度,有效的势垒在堆垛层错的Ag(111)表面状态估计独立的测量。考虑有效势垒的单量子阱模型能再现条纹上dI/dV谱的主要特征,而Kronig-Penney模型不能做到这一点。因此,本系统应被视为在各个条带上的解耦的1D状态,而不是在条带阵列上延伸的各向异性2D布洛赫状态。

英文摘要:

One-dimensional (1D) stripe structures with a periodicity of 1.3 nm are formed by introduction of stacking fault arrays into a Ag thin film. The surface states of such striped Ag thin films are studied using a low temperature scanning tunneling microscope. Standing waves running in the longitudinal direction and characteristic spectral peaks are observed by differential conductance (dI/dV) measurements, revealing the presence of 1D states on the surface stripes. Their formation can be attributed to quantum confinement of Ag(111) surface states into a stripe by stacking faults. To quantify the degree of confinement, the effective potential barrier at the stacking fault for Ag(111) surface states is estimated from independent measurements. A single quantum well model with the effective potential barrier can reproduce the main features of dI/dV spectra on stripes, while a Kronig-Penney model fails to do so. Thus the present system should be viewed as decoupled 1D states on individual stripes rather than as anisotropic 2D Bloch states extending over a stripe array.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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