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arXiv 0801.0413cond-mat.str-elcond-mat.mtrl-sci
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电场对一维绝缘体的影响:DMRG研究

Effect of Electric Field on One-Dimensional Insulators: A DMRG study

Sudipta Dutta, S. Lakshmi, Swapan K Pati

摘要:

我们利用密度矩阵重整化群(DMRG)方法对一维Mott链和Peierls链进行了广泛的计算,并明确地考虑了静态偏置,以研究这些体系中的绝缘体-金属相变.我们发现,电场诱导的绝缘体-金属的有限尺寸系统的转变的数量和在热力学极限,绝缘系统击穿到一个完全导电状态在一个临界值的偏压,这强烈依赖于绝缘参数。结果表明,在热力学极限下,Peierls绝缘体和莫特绝缘体的击穿不遵循Landau-Zener机制。对不同尺寸系统的计算表明,系统尺寸的增加降低了阈值偏置以及该偏置下的电荷间隙,使得绝缘体-金属过渡在这两种情况下都更尖锐。

英文摘要:

We perform density matrix renormalization group (DMRG) calculations extensively on one dimensional Mott and Peierls chains with explicit inclusion of the static bias to study the insulator-metal transition in those systems. We find that the electric field induces a number of insulator-metal transitions for finite size systems and at the thermodynamic limit, the insulating system breaks down into a completely conducting state at a critical value of bias which depends strongly on the insulating parameters. Our results indicate that the breakdown, in both the Peierls and Mott insulators, at thermodynamic limit, does not follow the Landau-Zener mechanism. Calculations on various size systems indicate that an increase in the system size decreases the threshold bias as well as the charge gap at that bias, making the insulator-metal transition sharper in both cases.

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