Nanoimprint and selective-area MOVPE for growth of GaAs/InAs core/shell nanowires

Haas, Fabian; Sladek, Kamil; Winden, A.; Ahe, Martina von der; Weirich, Thomas E.; Rieger, Torsten; Lüth, H.; Grützmacher, Detlev; Schäpers, Thomas; Hardtdegen, H.

doi:10.1088/0957-4484/24/8/085603

Cited by 48 publications

(40 citation statements)

References 38 publications

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“…Moreover, the combination of different materials in core/shell nanowires confines the electrons either to a channel in the center or to a thin tubular layer a few nanometers below the surface of the nanowire [21,22]. In a different approach [23] using etching techniques the core is removed and only the shell remains.…”

Section: Introductionmentioning

confidence: 99%

Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling

et al. 2016

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We compute analytically the weak (anti)localization correction to the Drude conductivity for electrons in tubular semiconductor systems of zinc-blende type. We include linear Rashba and Dresselhaus spin-orbit coupling (SOC) and compare wires of standard growth directions 100 , 111 , and 110 . The motion on the quasi-twodimensional surface is considered diffusive in both directions: transversal as well as along the cylinder axis. It is shown that Dresselhaus and Rashba SOC similarly affect the spin relaxation rates. For the 110 growth direction, the long-lived spin states are of helical nature. We detect a crossover from weak localization to weak antilocalization depending on spin-orbit coupling strength as well as dephasing and scattering rate. The theory is fitted to experimental data of an undoped 111 InAs nanowire device which exhibits a top-gate-controlled crossover from positive to negative magnetoconductivity. Thereby, we extract transport parameters where we quantify the distinct types of SOC individually.

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Section: Introductionmentioning

confidence: 99%

Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling

et al. 2016

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“…This provides a possibility to control band alignment through the core and shell thicknesses [13,14] and thus to achieve systems in which conduction electrons may be found only in the shell area [15]. The present art of manufacturing allows for etching the core part such that the remaining shell forms a nanotube of finite thickness [16,17]. If such nanowires are sufficiently short, i.e., of height much smaller that the radius, then they may be considered as quantum rings, as long as only the lowest wave-function mode in the growth direction is relevant.…”

Section: Introductionmentioning

confidence: 99%

Multi-domain electromagnetic absorption of triangular quantum rings

et al. 2016

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We present a theoretical study of the unielectronic energy spectra, electron localization, and optical absorption of triangular core-shell quantum rings. We show how these properties depend on geometric details of the triangle, such as side thickness or corners' symmetry. For equilateral triangles, the lowest six energy states (including spin) are grouped in an energy shell, are localized only around corner areas, and are separated by a large energy gap from the states with higher energy which are localized on the sides of the triangle. The energy levels strongly depend on the aspect ratio of the triangle sides, i.e., thickness/length ratio, in such a way that the energy differences are not monotonous functions of this ratio. In particular, the energy gap between the group of states localized in corners and the states localized on the sides strongly decreases with increasing the side thickness, and then slightly increases for thicker samples. With increasing the thickness the low-energy shell remains distinct but the spatial distribution of these states spreads. The behavior of the energy levels and localization leads to a thickness dependent absorption spectrum where one transition may be tuned in the THz domain and a second transition can be tuned from THz to the infrared range of electromagnetic spectrum. We show how these features may be further controlled with an external magnetic field. In this work the electron-electron Coulomb repulsion is neglected.

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“…One of the advantages of these systems is a possibility to establish band alignment through the thicknesses of the components [2][3][4] and thus grow structures in which electrons are confined only in narrow shell areas [5,6]. Moreover, the core part may be etched such that separated nanotubes are formed [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Most commonly CSNs have hexagonal cross-sections [6][7][8], but triangular [9,10] and circular [11] systems have also been achieved. Electrons confined in prismatic CSNs may form conductive channels along the sharp edges [2,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Conductance oscillations of core-shell nanowires in transversal magnetic fields

et al. 2016

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We analyze theoretically electronic transport through a core-shell nanowire in the presence of a transversal magnetic field. We calculate the conductance for a variable coupling between the nanowire and the attached leads and show how the snaking states, which are low-energy states localized along the lines of vanishing radial component of the magnetic field, manifest their existence. In the strong coupling regime they induce flux periodic, Aharonov-Bohm-like, conductance oscillations, which, by decreasing the coupling to the leads, evolve into well resolved peaks. The flux periodic oscillations arise due to interference of the snaking states, which is a consequence of backscattering at either the contacts with leads or magnetic/potential barriers in the wire.

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Nanoimprint and selective-area MOVPE for growth of GaAs/InAs core/shell nanowires

Cited by 48 publications

References 38 publications

Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling

Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling

Multi-domain electromagnetic absorption of triangular quantum rings

Conductance oscillations of core-shell nanowires in transversal magnetic fields

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