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arXiv 1403.7861cond-mat.mes-hall
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环状和约瑟夫森结螺旋Tomonaga-Luttinger液体的局域态密度

Local Density of States in a Helical Tomonaga-Luttinger Liquid of Loop and Josephson Junction Geometries

Yositake Takane

摘要:

在Tomonaga-Luttinger模型下研究了零温下一维有限长螺旋沟道中的局域态密度。两个特殊的情况下,环路和约瑟夫森结的几何形状。LDOS作为从费米能级测量的能量$ω$的函数,由$δ$函数类型的等间隔尖峰组成,并且电子-电子相互作用修改它们的相对高度。结果表明,在环几何,尖峰的高度减少$ω\to 0$无处不在的系统。研究还表明,在约瑟夫森结中,LDOS的行为显著地依赖于空间位置。在连接的端点处,高度以$ω\to 0$的形式增加,并且其变化比环的情况更明显。远离端点,尖峰的高度显示出非单调的$ω$依赖性,其在长结极限中消失。

英文摘要:

The local density of states (LDOS) in a one-dimensional helical channel of finite length is studied within a Tomonaga-Luttinger model at zero temperature. Two particular cases of loop and Josephson junction geometries are considered. The LDOS, as a function of energy $ω$ measured from the Fermi level, consists of equally spaced spikes of the $δ$-function type, and electron-electron interactions modify their relative height. It is shown that, in the loop geometry, the height of spikes decreases as $ω\to 0$ everywhere in the system. It is also shown that, in the Josephson junction, the behavior of the LDOS significantly depends on the spatial position. At the end points of the junction, the height increases as $ω\to 0$ and its variation is more pronounced than that in the loop case. Away from the end points, the height of spikes shows a non-monotonic $ω$-dependence, which disappears in the long-junction limit.

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