Neutral modes' edge state dynamics through quantum point contacts

被引：24
|
作者：
Ferraro, D. [1 ]
Braggio, A. [2 ]
Magnoli, N. [1 ]
Sassetti, M. [2 ]
机构：
[1] Univ Genoa, Ist Nazl Fis Nucl, Dipartimento Fis, I-16146 Genoa, Italy
[2] Univ Genoa, CNR INFM LAMIA, Dipartimento Fis, I-16146 Genoa, Italy
来源：
NEW JOURNAL OF PHYSICS | 2010年 / 12卷
关键词：
CHIRAL LUTTINGER LIQUIDS; HALL STATES; QUASI-PARTICLE; THERMAL TRANSPORT; FRACTIONAL CHARGE; SHOT-NOISE; EXCITATIONS; FLUIDS; REGIME; CLASSIFICATION;
D O I：
10.1088/1367-2630/12/1/013012
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The dynamics of neutral modes for fractional quantum Hall states is investigated for a quantum point contact geometry in the weak-backscattering regime. The effective field theory introduced by Fradkin-Lopez for edge states in the Jain sequence is generalized to the case of propagating neutral modes. The dominant tunnelling processes are identified also in the presence of non-universal phenomena induced by interactions. The crossover regime in the backscattering current between tunnelling of single-quasiparticles and of agglomerates of p-quasiparticles is analysed. We demonstrate that higher-order cumulants of the backscattering current fluctuations are a unique resource to study quantitatively the competition between different carrier charges. We find that propagating neutral modes are a necessary ingredient in order to explain this crossover phenomenon.
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收藏
页数：26
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