Dimensional Crossovers in Magnetoresistance of Submicron Films and Wires of CdTe:In

Jaroszyński, J.; Wróbel, J.; Sawicki, M.; Skośkiewicz, T.; Karczewski, G.; Wójtowicz, T.; Kossut, J.; Dietl, T.; Kamińska, E.; Papis, E.; Piotrowska, A.; Duś, R.; Nowakowski, Robert

doi:10.12693/aphyspola.90.1027

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Sim . As expected, UCF are averaged over impurity configurations in each of the wires and no more resolved -only the weak localization conductance minimum around zero magnetic field is visible (the detailed discussion of magnetoconductance at weak magnetic fields is given by Jaroszyński et al [20] in this volume). At Τ = 30 mK we have LT = 0.55 m and Lφ = 12 μm [5], therefore amplitude ΔG of the single wire should be reduced approximately by the factor LT/L = 0.11, in good agreement with the experiment.…”

Section: Universal Conductance Fluctuations In Cdmntementioning

confidence: 72%

Electron Transport in Submicron Wires of Semiconductors

Wróbel

1996

Acta Phys. Pol. A

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We review the methods of fabrication and transport properties of submicron II-VI, IV-VI and IlI-V semiconductor wires. Devices were prepared by electron-beam lithograply and used for detailed magnetotransport studies, carried out at low (down to 30 mK) temperatures. We discuss a number of novel features obtained in ballistic, diffusive and localized transport regimes. Iń particular, we describe the universal conductance fluctuations for semimagnetic materials (CdMnTe) and discuss the edge channel transport for PbTe, PbSe and GaAs/GaA1As systems.

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Section: Universal Conductance Fluctuations In Cdmntementioning

confidence: 72%

Electron Transport in Submicron Wires of Semiconductors

Wróbel

1996

Acta Phys. Pol. A

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“…If the interference pattern splits when left-and rightmoving electrons start to differ in energy, we may ask if the Zeeman splitting induced by the external field, will lead to a similar effect. Actually, the influence of spin splitting upon mesoscopic conductance fluctuations was observed for diffusive transport in quantum wires of diluted magnetic semiconductor (Cd,Mn)Te:In [23]. It was found that the correlation field B c of the universal conductance fluctuations scales with the s-d exchange spin splitting of the conduction band.…”

mentioning

confidence: 99%

0.7 anomaly and magnetotransport of disordered quantum wires

et al. 2008

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The unexpected "0.7" plateau of conductance quantisation is usually observed for ballistic onedimensional devices. In this work we study a quasi-ballistic quantum wire, for which the disorder induced backscattering reduces the conductance quantisation steps. We find that the transmission probability resonances coexist with the anomalous plateau. The studies of these resonances as a function of the in-plane magnetic field and electron density point to the presence of spin polarisation at low carrier concentrations and constitute a method for the determination of the effective g-factor suitable for disordered quantum wires.PACS numbers: 73.63. Nm, 73.23.Ad, 72.25.Dc It is expected that quantum point contacts (QPC) and quantum wires (QW) will act as active components of future nano-electronic devices and circuits. Therefore, the renewed interest in transport and spin properties of one-dimensional (1D) systems recently takes place in the mesoscopic physics community. In those studies, special attention is directed towards the long standing problem of quantum transport -the so called "0.7 anomaly" [1] most often, but not exclusively, observed for devices fabricated on modulation doped GaAs/AlGaAs heterostructures. Usually, anomalous behavior is observed in transport data as a "kink" on the conductance G vs. the device width curve, occurring for the low carrier densities, when G ∼ 0.7 × 2e 2 /h, here −e is the electron charge and h is the Planck constant. The origin of this effect is currently under active debate since this anomaly seems to be an universal, but still unexplained feature of one-dimensional mesoscopic transport. Experimentally, the magnetic field dependence of the additional plateau is common for all studied systems -by applying a parallel in-plane field the 0.7 feature evolves gradually towards 0.5 × 2e 2 /h conductance step, when only one spinpolarised level is occupied [1,2,3,4,5,6]. Therefore, it has been suggested that such an anomalous plateau is due to spontaneous spin polarisation of one-dimensional electron liquid, caused by exchange interactions among carriers in the constricted geometry of the device [2,7]. If it is so, the 1D systems may be used as an efficient spin filter with possible practical applications. This point of * Also at Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, Hoża 69, PL 00-681 Warszawa, Poland; ERATO Semiconductor Spintronics Project, Japan Science Technology Agency, 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan † Also at ERATO Semiconductor Spintronics Project, Japan Science and Technology Agency, 1-18 Kitamemachi, Aoba-ku Sendai, 980-0023, Japan view is supported by magnetic focusing data obtained for the p-type device, which reveal the static spin polarisation of holes transmitted through the constriction [8].Furthermore, recent shot-noise measurements carried out for n-type QPC [9] show that distinct transport channels exist at G < 2e 2 /h = G 0 , presumably related to spin, exhibiting quite different transmission probabilities.Many experiments, howeve...

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“…This coupling gives rise to spin-disorder scattering, giant spin-splitting of electronic states in magnetic fields, and the formation of magnetic polarons [5]. Furthermore, we present results of our experimental studies [6], which have recently been carried out on submicron wires of MBE grown Cd 1−x Mn x Te:In epilayers. Our findings, together with earlier experimental results for microstructures of narrow-gap Hg 1−x−y Cd y Mn x Te bicrystals [7,8], show that spin-disorder scattering gives rise to an additional phasebreaking mechanism but its destructive influence on the amplitude of universal conductance fluctuation (UCF) is much weaker than in metals.…”

Section: Introductionmentioning

confidence: 99%

Universal conductance fluctuations in submicron wires of

Dietl

Jaroszyński

Grabecki

et al. 1996

Semicond. Sci. Technol.

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Mesoscopic phenomena in nanostructures that incorporate diluted magnetic semiconductors may exhibit a number of novel features driven by spin interactions between mobile electrons and localized spins. Millikelvin studies of linear and nonlinear diffusive charge transport, which have been carried out for submicron wires of n + -Cd 1−x Mn x Te epilayers as well as for microstructures of Hg 1−x −y Cd y Mn x Te bicrystals, are reviewed. These studies have provided information on the significance of spin-disorder scattering and evidence of a new driving mechanism of the magnetoconductance fluctuations-the redistribution of the electrons between energy levels of the system, induced by the giant s-d exchange spin-splitting. Important implications of these findings for previous interpretations of spin effects in semiconductor and metal nanostructures are discussed.

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Dimensional Crossovers in Magnetoresistance of Submicron Films and Wires of CdTe:In

Cited by 3 publications

References 9 publications

Electron Transport in Submicron Wires of Semiconductors

Electron Transport in Submicron Wires of Semiconductors

0.7 anomaly and magnetotransport of disordered quantum wires

Universal conductance fluctuations in submicron wires of

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