Twisted CFT and bilayer quantum Hall systems in the presence of an impurity

被引：17
|
作者：
Cristofano, G
Marotta, V
Naddeo, A
机构：
[1] Univ Naples Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy
[2] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy
[3] Ist Nazl Fis Nucl, Unita Napoli, I-80126 Naples, Italy
来源：
PHYSICS LETTERS B | 2003年 / 571卷 / 3-4期
关键词：
vertex operator; Kac-Moody algebra; quantum Hall effect;
D O I：
10.1016/j.physletb.2003.04.001
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We identify the impurity interactions of the recently proposed CFT description of a bilayer quantum Hall system at filling nu = m/pm+2 [Mod. Phys. Lett. A 15 (2000) 1679]. Such a CFT is obtained by m-reduction on the one layer system, with a resulting pairing symmetry and presence of quasi-holes. For the m = 2 case boundary terms are shown to describe an impurity interaction which allows for a localized tunnel of the Kondo problem type. The presence of an anomalous fixed point is evidenced at finite coupling which is unstable with respect to unbalance and flows to a vacuum state with no quasi-holes. (C) 2003 Published by Elsevier B.V.
引用
收藏
页码：250 / 259
页数：10
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