Current Suppression in Transport Through Triple Quantum Dots Coupled to Ferromagnetic Leads

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

Abstracts

EN

We consider transport through triple quantum dot system in a triangular geometry weakly coupled to external ferromagnetic leads. The real-time diagrammatic technique in the lowest order perturbation theory is used to calculate the current and Fano factor in the parallel and antiparallel magnetic configuration of the system as well as the resulting tunnel magnetoresistance (TMR). We focus on the transport regime where the current is suppressed and show that it can lead to negative differential conductance and large super-Poissonian shot noise, which are present in both magnetic configurations. Furthermore, we show that for voltages where the system is trapped in a one-particle dark state the TMR becomes suppressed, while for two-particle blockade, the TMR is much enhanced.

Keywords

EN

73.23.-b; 73.21.La; 85.75.-d

Discipline

• 73.23.-b: Electronic transport in mesoscopic systems
• 73.21.La: Quantum dots
• 85.75.-d: Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 460-462

Dates

published

2015-02

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] C. Emary, Phys. Rev. B 76, 245319 (2007), doi: 10.1103/PhysRevB.76.245319
• [3] C. Poltl, C. Emary, T. Brandes, Phys. Rev. B 80, 115313 (2009), doi: 10.1103/PhysRevB.80.115313
• [4] T. Kostyrko, B.R. Bułka, Phys. Rev. B 79, 075310 (2009), doi: 10.1103/PhysRevB.79.075310
• [5] I. Weymann, B. R. Bułka, J. Barnaś, Phys. Rev. B 83, 195302 (2011), doi: 10.1103/PhysRevB.83.195302
• [6] I. Weymann, J. König, J. Martinek, J. Barnaś, G. Schön, Phys. Rev. B 72, 115334 (2005), doi: 10.1103/PhysRevB.72.115334
• [7] J. Barnaś, I. Weymann, J. Phys.: Condens. Matter 20, 423202 (2008), doi: 10.1088/0953-8984/20/42/423202
• [8] H. Schoeller, G. Schön, Phys. Rev. B 50, 18436 (1994), doi: 10.1103/PhysRevB.50.18436
• [8a] J. König, J. Schmid, H. Schoeller, G. Schön, Phys. Rev. B 54, 16820 (1996), doi: 10.1103/PhysRevB.54.16820
• [9] 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.127.460