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arXiv 0707.3569cond-mat.mes-hallcond-mat.str-el
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横向磁场作用下大半径碳纳米管中的双势垒输运

Transport through a double barrier in Large Radius Carbon Nanotubes in the presence of a transverse magnetic field

S. Bellucci, P. Onorato

摘要:

讨论了在横向磁场$B$作用下,大半径碳纳米管(如多壁碳纳米管)的Luttinger液体行为.我们的结果意味着减少与$B$的$bulk$临界指数,$α_{bulk}$,隧道态密度的值,这是在协议中观察到的传输实验。然后,研究了在强横向磁场$B$作用下,沿MWNT分子内两个隧穿势垒形成的量子点与Tomonaga-Luttinger液体弱耦合的输运问题. {We预测电导G相对于$B$的一些峰值的存在,其与弹道状态(在非常低的温度下,$T$)以及在较高的$T$下的磁通量量子化有关,其中Luttinger行为占主导地位}。根据顺序调谐的电导峰的最大$G_{max}$的温度依赖性遵循幂律,$G\propto T^{γ_e-1}$,其中$γ_e$线性地依赖于临界指数,$α_{end}$被$B$强烈地降低。

英文摘要:

We discuss the Luttinger Liquid behaviour of Large Radius Carbon Nanotube e.g. the Multi Wall ones (MWNT), under the action of a transverse magnetic field $B$. Our results imply a reduction with $B$ in the value of the $bulk$ critical exponent, $α_{bulk}$, for the tunneling density of states, which is in agreement with that observed in transport experiments. Then, the problem of the transport through a Quantum Dot formed by two intramolecular tunneling barriers along the MWNT, weakly coupled to Tomonaga-Luttinger liquids is studied, including the action of a strong transverse magnetic field $B$. {We predict the presence of some peaks in the conductance G versus $B$, related to the magnetic flux quantization in the ballistic regime (at a very low temperature, $T$) and also at higher $T$, where the Luttinger behaviour dominates}. The temperature dependence of the maximum $G_{max}$ of the conductance peak according to the Sequential Tunneling follows a power law, $G\propto T^{γ_e-1}$ with $γ_e$ linearly dependent on the critical exponent, $α_{end}$, strongly reduced by $B$.

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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