Conductance maps of quantum rings due to a local potential perturbation

被引：12

作者：

Petrovic, M. D. ^{[1
]}

Peeters, F. M. ^{[1
,2
]}

Chaves, A. ^{[2
]}

Farias, G. A. ^{[2
]}

机构：

[1] Univ Antwerp, Dept Phys, BE-2020 Antwerp, Belgium

[2] Univ Fed Ceara, Dept Phys, BR-60455900 Fortaleza, Ceara, Brazil

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 49期

关键词：

Aharonov-bohm oscillations - Exposed to - External magnetic field - Gaussians - Landauer formalisms - Local potentials - Oscillation patterns - Quantum ring;

D O I：

10.1088/0953-8984/25/49/495301

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We performed a numerical simulation of the dynamics of a Gaussian shaped wavepacket inside a small sized quantum ring, smoothly connected to two leads and exposed to a perturbing potential of a biased atomic force microscope tip. Using the Landauer formalism, we calculated conductance maps of this system in the case of single and two subband transport. We explain the main features in the conductance maps as due to the AFM tip influence on the wavepacket phase and amplitude. In the presence of an external magnetic field, the tip modifies the phi(0) periodic Aharonov-Bohm oscillation pattern into a phi(0)/2 periodic Al'tshuler-Aronov-Spivak oscillation pattern. Our results in the case of multiband transport suggest tip selectivity to higher subbands, making them more observable in the total

引用

页数：9

共 21 条

[1] SIGNIFICANCE OF ELECTROMAGNETIC POTENTIALS IN THE QUANTUM THEORY [J].

AHARONOV, Y ;

BOHM, D .

PHYSICAL REVIEW, 1959, 115 (03) :485-491

[2]

ALTSHULER BL, 1981, JETP LETT+, V33, P94

[3] Classical Hall effect in scanning gate experiments [J].

Baumgartner, A. ;

Ihn, T. ;

Ensslin, K. ;

Papp, G. ;

Peeters, F. ;

Maranowski, K. ;

Gossard, A. C. .

PHYSICAL REVIEW B, 2006, 74 (16)

[4] Wave packet dynamics in semiconductor quantum rings of finite width [J].

Chaves, Andrey ;

Farias, G. A. ;

Peeters, F. M. ;

Szafran, B. .

PHYSICAL REVIEW B, 2009, 80 (12)

[5] Schrodinger-Poisson calculations for scanning gate microscopy of quantum rings based on etched two-dimensional electron gas [J].

Chwiej, T. ;

Szafran, B. .

PHYSICAL REVIEW B, 2013, 87 (08)

[6] Imaging fractal conductance fluctuations and scarred wave functions in a quantum billiard [J].

Crook, R ;

Smith, CG ;

Graham, AC ;

Farrer, I ;

Beere, HE ;

Ritchie, DA .

PHYSICAL REVIEW LETTERS, 2003, 91 (24)

[7] Measurement of the tip-induced potential in scanning gate experiments [J].

Gildemeister, A. E. ;

Ihn, T. ;

Sigrist, M. ;

Ensslin, K. ;

Driscoll, D. C. ;

Gossard, A. C. .

PHYSICAL REVIEW B, 2007, 75 (19)

[8] Theory of scanning gate microscopy [J].

Gorini, Cosimo ;

Jalabert, Rodolfo A. ;

Szewc, Wojciech ;

Tomsovic, Steven ;

Weinmann, Dietmar .

PHYSICAL REVIEW B, 2013, 88 (03)

[9] Imaging and controlling electron transport inside a quantum ring [J].

Hackens, B. ;

Martins, F. ;

Ouisse, T. ;

Sellier, H. ;

Bollaert, S. ;

Wallart, X. ;

Cappy, A. ;

Chevrier, J. ;

Bayot, V. ;

Huant, S. .

NATURE PHYSICS, 2006, 2 (12) :826-830

[10]

Ihn T, 2010, SEMICONDUCTOR NANOST, P232

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