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arXiv 0811.4000cond-mat.mes-hallcond-mat.mtrl-sci
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体态和表面态的哈密顿分解

Hamiltonian decomposition for bulk and surface states

Ken-ichi Sasaki, Yuji Shimomura, Yositake Takane, Katsunori Wakabayashi

摘要:

我们证明了一个紧束缚哈密顿与最近和次最近邻跳跃积分可以分解成一个一般的晶格系统中的体积和边界部分。的哈密顿分解表明,下一个最近的邻居跳跃引起相当大的变化,即使修正的体态的能谱的表面状态的能谱是可以忽略不计的。通过对石墨烯系统边缘态的哈密顿分解,我们证明了次近邻跳跃稳定了边缘态。

英文摘要:

We demonstrate that a tight-binding Hamiltonian with nearest- and next-nearest-neighbor hopping integrals can be decomposed into bulk and boundary parts in a general lattice system. The Hamiltonian decomposition reveals that next nearest-neighbor hopping causes sizable changes in the energy spectrum of surface states even if the correction to the energy spectrum of bulk states is negligible. By applying the Hamiltonian decomposition to edge states in graphene systems, we show that the next nearest-neighbor hopping stabilizes the edge states.

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