Current noise spectrum of a quantum shuttle

被引:41
作者
Flindt, C
Novotny, T
Jauho, AP
机构
[1] Tech Univ Denmark, Dept Micor & Nanotechnol, DK-2800 Lyngby, Denmark
[2] Univ Copenhagen, Nano Sci Ctr, DK-2100 Copenhagen, Denmark
[3] Charles Univ Prague, Fac Math & Phys, Dept Elect Struct, Prague 12116, Czech Republic
关键词
NEMS; quantum shuttles; current noise;
D O I
10.1016/j.physe.2005.05.040
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We present a method for calculating the full current noise spectrum S(omega) for the class of nano-electromechanical systems (NEMS) that can be described by a Markovian generalized master equation. As a specific example we apply the method to a quantum shuttle. The noise spectrum of the shuttle has peaks at integer multiples of the mechanical frequency, which is slightly renormalized. The renormalization explains a previously observed small deviation of the shuttle Current compared to the expected value given by the product of the natural mechanical frequency and the electron charge. For a certain parameter range the quantum shuttle exhibits a coexistence regime, where the charges are transported by two different mechanisms: Shuttling and sequential tunneling. In our previous studies we showed that characteristic features in the zero-frequency noise could be quantitatively understood as a slow switching process between the two current channels, and the present study shows that this interpretation holds also qualitatively at finite frequency. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:411 / 418
页数:8
相关论文
共 16 条
[1]   Shot noise spectrum of open dissipative quantum two-level systems [J].
Aguado, R ;
Brandes, T .
PHYSICAL REVIEW LETTERS, 2004, 92 (20) :206601-1
[2]  
[Anonymous], 1962, NOISE FLUCTUATIONS I
[3]   Current noise of a single-electron transistor coupled to a nanomechanical resonator [J].
Armour, AD .
PHYSICAL REVIEW B, 2004, 70 (16) :1-11
[4]   Shot noise in mesoscopic conductors [J].
Blanter, YM ;
Büttiker, M .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2000, 336 (1-2) :1-166
[5]   Quantum electromechanical systems [J].
Blencowe, M .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2004, 395 (03) :159-222
[6]  
DONARINI A, 2004, THESIS TU DENMARK LY
[7]   Quantum shuttle phenomena in a nanoelectromechanical single-electron transistor [J].
Fedorets, D ;
Gorelik, LY ;
Shekhter, RI ;
Jonson, M .
PHYSICAL REVIEW LETTERS, 2004, 92 (16) :166801-1
[8]   Current noise in a vibrating quantum dot array [J].
Flindt, C ;
Novotny, T ;
Jauho, AP .
PHYSICAL REVIEW B, 2004, 70 (20) :205334-1
[9]   Full counting statistics of nano-electromechanical systems [J].
Flindt, C ;
Novotny, T ;
Jauho, AP .
EUROPHYSICS LETTERS, 2005, 69 (03) :475-481
[10]  
Gardiner C. W., 2000, QUANTUM NOISE