Valley blockade and multielectron spin-valley Kondo effect in silicon

Crippa, Alessandro; Tagliaferri, Marco; Rotta, Davide; Michielis, M. De; Mazzeo, G.; Fanciulli, M.; Wacquez, R.; Vinet, M.; Prati, Enrico

doi:10.1103/physrevb.92.035424

Cited by 15 publications

(10 citation statements)

References 51 publications

(78 reference statements)

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“…5(b), and the trend of the coefficients A and B are shown in the inset as a function of temperature, and as can be seen, there the range of increase in coefficient A is seen to increase at a faster rate than the change in coefficient B; this was taken to explain the dominance of co tunneling over sequential tunnelling in this low current regime. 40 As mentioned previously, the differen tial conductance sweeps exhibit strong resonance peaks at around 10 mV. These peaks are temperature and magnetic field dependent and exponentially decrease in height with an increase in either parameter [shown in Figs.…”

Section: B Electronic Transportmentioning

confidence: 54%

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Observation of strong Kondo like features and co-tunnelling in superparamagnetic GdCl3 filled 1D nanomagnets

Ncube

Coleman

Sousa

et al. 2018

Journal of Applied Physics

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Filling of carbon nanotubes has been tailored over years to modify the exceptional properties of the 1 dimensional conductor for magnetic property based applications. Hence, such a system exploits the spin and charge property of the electron, analogous to a quantum conductor coupled to mag netic impurities, which poses an interesting scenario for the study of Kondo physics and related phenomena. We report on the electronic transport properties of MWNTs filled with GdCl 3 nano magnets, which clearly show the co existence of Kondo correlation and cotunelling within the superparamagnetic limit. The Fermi liquid description of the Kondo effect and the interpolation scheme are fitted to the resistance temperature dependence yielding the onset of the Kondo scatter ing temperature and a Kondo temperature for this nanocomposite, respectively. Cotunneling of conduction electrons interfering with a Kondo type interaction has been verified from the exponen tial decay of the intensity of the fano shaped nonzero bias anomalous conductance peaks, which also show strong resonant features observed only in GdCl 3 filled MWNT devices. Hence, these fea tures are explained in terms of magnetic coherence and spin flip effects along with the competition between the Kondo effect and co tunneling. This study raises a new possibility of tailoring magnetic interactions for spintronic applications in carbon nanotube systems.

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Section: B Electronic Transportmentioning

confidence: 54%

“…6(a), the differential conductance exhibits resonance peak features which are strongly tempera ture dependent. In order to probe the interaction of sequential and co tunneling conductivity, we rely on the theory devel oped for Coulomb gap inelastic co tunneling 40,41 I…”

Section: B Electronic Transportmentioning

confidence: 99%

Observation of strong Kondo like features and co-tunnelling in superparamagnetic GdCl3 filled 1D nanomagnets

Ncube

Coleman

Sousa

et al. 2018

Journal of Applied Physics

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“…During the Coulomb Blockade phenomenon, the electrons inside this quantum sized device will create a strong coulomb repulsion that prevent other electrons to flow, resulting in the device will no longer follow Ohm's law as shown in Figures 2a-2c. When very few electrons are involved and an external static magnetic field is applied, Coulomb blockade provides the ground for spin blockade (also called Pauli blockade) and valley blockade [16,17] which includes quantum mechanical effects due to spin and orbital interactions, respectively, between the electrons.…”

Section: Coulomb Blockadementioning

confidence: 99%

Silver Nanoparticles: Synthesis, Characterization and Applications

Chouhan¹

2018

Silver Nanoparticles - Fabrication, Characterization and Applications

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Day by day augmenting importance of metal nanoparticles in the versatile fields like, catalyst, electronic, magnetic, mechanic, optical optoelectronic, materials for solar cell and fuel cell, medical, bioimaging, cosmetic, ultrafast data communication and optical data storage, etc, is increasing their value. Nanoparticles of alkali metals and noble metals (copper, silver, platinum, palladium, and gold, etc.) have a broad absorption band in the visible region of the electromagnetic spectrum of light, because the solutions of these metal nanoparticles show the intense color, which is absent in their bulk counterparts as well as their atomic level. The main cause behind this phenomenon is attributed to the collective oscillations of the free conductive electrons that are induced by an interaction with electromagnetic field. The whole incidence is known as localized surface plasmonic resonance. Out of these, we have selected the silver nanoparticles for the studies. In this article, we will discuss the synthesis, characterization, and application of the silver nanoparticles. Future prospective and challenges in the field commercialization of the nanosilver is also discussed.

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“…Artificial atoms 9 , as well as donor atoms in silicon 17 22 23 24 25 26 27 , are conveniently treated as Hubbard systems 21 in which onsite Coulomb repulsion is able to create a gap 28 . Even if a number of properties of solids are accounted for in terms of Bloch bands, while Coulomb interactions between electrons are neglected, band theory fails for materials with low magnetic-ordering temperatures but large insulating gaps 29 .…”

mentioning

confidence: 99%

Band transport across a chain of dopant sites in silicon over micron distances and high temperatures

Prati

Kumagai

Hori

et al. 2016

Sci Rep

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Macroscopic manifestations of quantum mechanics are among the most spectacular effects of physics. In most of them, novel collective properties emerge from the quantum mechanical behaviour of their microscopic constituents. Others, like superconductivity, extend a property typical of the atomic scale to macroscopic length scale. Similarly, features of quantum transport in Hubbard systems which are only observed at nanometric distances in natural and artificial atoms embedded in quantum devices, could be in principle extended to macroscopic distances in microelectronic devices. By employing an atomic chain consists of an array of 20 atoms implanted along the channel of a silicon transistor with length of 1 μm, we extend to such unprecedented distance both the single electron quantum transport via sequential tunneling, and to room temperature the features of the Hubbard bands. Their observation provides a new example of scaling of quantum mechanical properties, previously observed only at the nanoscale, up to lengths typical of microelectronics, by opening new perspectives towards passage of quantum states and band engineering in silicon devices.

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Valley blockade and multielectron spin-valley Kondo effect in silicon

Cited by 15 publications

References 51 publications

Observation of strong Kondo like features and co-tunnelling in superparamagnetic GdCl3 filled 1D nanomagnets

Observation of strong Kondo like features and co-tunnelling in superparamagnetic GdCl3 filled 1D nanomagnets

Silver Nanoparticles: Synthesis, Characterization and Applications

Band transport across a chain of dopant sites in silicon over micron distances and high temperatures

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