Influence of Magnetic Field on Dark States in Transport through Triple Quantum Dots

• Authors: K. Wrześniewski , I. Weymann
• Languages of publication: EN

Abstracts

EN

We theoretically study the electronic transport through a triple quantum dot system in triangular geometry weakly coupled to external metallic leads. By means of the real-time diagrammatic technique, the current and Fano factor are calculated in the lowest order of perturbation theory. The device parameters are tuned to such transport regime, in which coherent population trapping of electrons in quantum dots due to the formation of dark states occurs. The presence of such states greatly influences transport properties leading to a strong current blockade and enhanced, super-Poissonian shot noise. We consider both one- and two-electron dark states and examine the influence of magnetic field on coherent trapping in aforementioned states. When the system is in one-electron dark state, we observe a small shift of the blockade's region, whereas in the case of two-electron dark state, we show that strong magnetic field can lift the current blockade completely.

Keywords

EN

73.23.-b; 73.21.La

Discipline

• 73.23.-b: Electronic transport in mesoscopic systems
• 73.21.La: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 1
• Pages: 108-111

Dates

published

2017-07

Contributors

author

K. Wrześniewski

• Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

I. Weymann

• Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

References

• [1] L.P. Kouwenhoven, D.G. Austing, S. Tarucha, Rep. Prog. Phys. 64, 701 (2001), doi: 10.1088/0034-4885/64/6/201
• [2] D. Loss, D.P. DiVincenzo, Phys. Rev. A 57, 120 (1998), doi: 10.1103/PhysRevA.57.120
• [3] C.-Y. Hsieh, Y.-P. Shim, M. Korkusinski, P. Hawrylak, Rep. Prog. Phys. 75, 114501 (2012), doi: 10.1088/0034-4885/64/6/201
• [4] K. Wrześniewski, I. Weymann, Phys. Rev. B 92, 045407 (2015), doi: 10.1103/PhysRevB.92.045407
• [5] C. Emary, Phys. Rev. B 76, 245319 (2007), doi: 10.1103/PhysRevB.76.245319
• [6] C. Poltl, C. Emary, T. Brandes, Phys. Rev. B 80, 115313 (2009), doi: 10.1103/PhysRevB.80.115313
• [7] I. Weymann, B.R. Bułka, J. Barnaś, Phys. Rev. B 83, 195302 (2011), doi: 10.1103/PhysRevB.83.195302
• [8] K. Wrześniewski, I. Weymann, Acta Phys. Pol. A 127, 460 (2015), doi: 10.12693/APhysPolA.127.460
• [9] H. Schoeller, G. Schön, Phys. Rev. B 50, 18436 (1994), doi: 10.1103/PhysRevB.50.18436
• [9a] J. König, J. Schmid, H. Schoeller, G. Schön, Phys. Rev. B 54, 16820 (1996), doi: 10.1103/PhysRevB.54.16820
• [10] A. Thielmann, M.H. Hettler, J. König, G. Schön, Phys. Rev. Lett. 95, 146806 (2005), doi: 10.1103/PhysRevLett.95.146806

Identifiers

DOI

10.12693/APhysPolA.132.108