Shot noise in ferromagnetic single-electron tunneling devices

Bułka, Bogdan R.; Martinek, J.; Michałek, G.; Barnaś, J.

doi:10.1103/physrevb.60.12246

Cited by 72 publications

(102 citation statements)

References 40 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[18][19][20][21][22] The quantity characterizing the current noise is the Fano factor F = S / 2eI. It measures how far the distribution of the tunneling events differs from the random Poissonian distribution:…”

Section: Model and Theoretical Methodsmentioning

confidence: 99%

Connection between noise and quantum correlations in a double quantum dot

2008

View full text Add to dashboard Cite

We investigate the current and noise characteristics of a double quantum dot system. The strong correlations induced by the Coulomb interaction and the Pauli principle create entangled two-electron states and lead to signatures in the transport properties. We show that the interaction parameter , which measures the admixture of the double-occupancy contribution to the singlet state and thus the degree of entanglement, can be directly accessed through the Fano factor of super-Poissonian shot noise.

show abstract

Section: Model and Theoretical Methodsmentioning

confidence: 99%

Connection between noise and quantum correlations in a double quantum dot

2008

View full text Add to dashboard Cite

show abstract

“…The difference between the two spin polarizations in the electrodes is phenomenologically modeled as a difference in resistances: Thus, if the ferromagnetic reservoir 1 is spin-up polarized, the resistance R 1↓ for spin-down electrons is much higher than the resistance R 1↑ for spinup electrons. Assuming that all the resistances are much higher than R k , Bu lka et al [300] generalize the master equation approach to the case of spin-dependent transport, and present results of a numerical calculation.…”

Section: A Coulomb Blockadementioning

confidence: 99%

“…Bu lka et al [300] only treat the limiting case when, say, spin-down electrons cannot propagate in the ferromagnet at all (R 1↓ = ∞). They find that the I-V curve in this case shows negative differential resistance, and shot noise may be enhanced above the Poisson value, similarly to what we have discussed in Section V for quantum wells.…”

Section: A Coulomb Blockadementioning

confidence: 99%

See 1 more Smart Citation

Shot noise in mesoscopic conductors

2000

View full text Add to dashboard Cite

Theoretical and experimental work concerned with dynamic fluctuations has developed into a very active and fascinating subfield of mesoscopic physics. We present a review of this development focusing on shot noise in small electric conductors. Shot noise is a consequence of the quantization of charge. It can be used to obtain information on a system which is not available through conductance measurements. In particular, shot noise experiments can determine the charge and statistics of the quasiparticles relevant for transport, and reveal information on the potential profile and internal energy scales of mesoscopic systems. Shot noise is generally more sensitive to the effects of electron-electron interactions than the average conductance. We present a discussion based on the conceptually transparent scattering approach and on the classical Langevin and BoltzmannLangevin methods; in addition a discussion of results which cannot be obtained by these methods is provided. We conclude the review by pointing out a number of unsolved problems and an outlook on the likely future development of the field.

show abstract

“…In order to obtain additional information, not contained in the average current, shot noise has also been analyzed in several spintronic systems. A few examples include shot noise in spin-valve junctions [27][28][29][30] and quantum dots attached to ferromagnetic leads. [31][32][33] Here we apply the Keldysh nonequilibrium technique to study spin-polarized transport ͑current and shot noise͒ in a FM-QD-FM system ͑Fig.…”

Section: Introductionmentioning

confidence: 99%

Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green’s functions

2008

View full text Add to dashboard Cite

Using non-equilibrium Green functions we calculate the spin-polarized current and shot noise in a ferromagnet-quantum-dot-ferromagnet (FM-QD-FM) system. Both parallel (P) and antiparallel (AP) magnetic configurations are considered. Coulomb interaction and coherent spin-flip (similar to a transverse magnetic field) are taken into account within the dot. We find that the interplay between Coulomb interaction and spin accumulation in the dot can result in a bias-dependent current polarization ℘. In particular, ℘ can be suppressed in the P alignment and enhanced in the AP case depending on the bias voltage. The coherent spin-flip can also result in a switch of the current polarization from the emitter to the collector lead. Interestingly, for a particular set of parameters it is possible to have a polarized current in the collector and an unpolarized current in the emitter lead. We also found a suppression of the Fano factor to values well below 0.5.

show abstract

Shot noise in ferromagnetic single-electron tunneling devices

Cited by 72 publications

References 40 publications

Connection between noise and quantum correlations in a double quantum dot

Connection between noise and quantum correlations in a double quantum dot

Shot noise in mesoscopic conductors

Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green’s functions

Contact Info

Product

Resources

About