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Angle-dependent magnetotransport in GaAs/InAs core/shell nanowires.

Haas F, Wenz T, Zellekens P, Demarina N, Rieger T, Lepsa M, Grützmacher D, Lüth H, Schäpers T - Sci Rep (2016)

Bottom Line: These are attributed to transport via angular momentum states, formed by electron waves within the InAs shell.Universal conductance fluctuations are observed for all tilt angles, however with increasing amplitudes for large tilt angles.We record this evolution of the electron propagation from a circling motion around the core to a diffusive transport through scattering loops and give explanations for the observed different transport regimes separated by the magnetic field orientation.

View Article: PubMed Central - PubMed

Affiliation: Peter Grünberg Institute 9, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.

ABSTRACT
We study the impact of the direction of magnetic flux on the electron motion in GaAs/InAs core/shell nanowires. At small tilt angles, when the magnetic field is aligned nearly parallel to the nanowire axis, we observe Aharonov-Bohm type h/e flux periodic magnetoconductance oscillations. These are attributed to transport via angular momentum states, formed by electron waves within the InAs shell. With increasing tilt of the nanowire in the magnetic field, the flux periodic magnetoconductance oscillations disappear. Universal conductance fluctuations are observed for all tilt angles, however with increasing amplitudes for large tilt angles. We record this evolution of the electron propagation from a circling motion around the core to a diffusive transport through scattering loops and give explanations for the observed different transport regimes separated by the magnetic field orientation.

No MeSH data available.


Related in: MedlinePlus

Magnetoconductance of nanowire A at different angles γ with respect to the magnetic field direction as defined in Fig. 1(e).The curves are offset by ΔG = 0.25 e2/h for clarity. A dotted guideline is provided to help separating the tilt ranges described in the text. For small tilt angles Aharonov–Bohm type oscillations are clearly visible, while for larger tilt angles an UCF pattern dominates the signal.
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f3: Magnetoconductance of nanowire A at different angles γ with respect to the magnetic field direction as defined in Fig. 1(e).The curves are offset by ΔG = 0.25 e2/h for clarity. A dotted guideline is provided to help separating the tilt ranges described in the text. For small tilt angles Aharonov–Bohm type oscillations are clearly visible, while for larger tilt angles an UCF pattern dominates the signal.

Mentions: Figure 3 shows the magnetoconductance of sample A at selected tilt angles from a nearly parallel orientation of the nanowire axis with the magnetic field (γA = 15°) to a perpendicular oriented field (γA = 90°). The measured curves are all symmetric around zero magnetic field, therefore fulfilling the Onsager symmetry relation expected for two terminal transport. We distinguish two different tilt ranges (separated by the horizontal guideline in Fig. 3), where a clear change of the magnetoconductance signal is observed. The magnetoconductance of sample B is showing a similar behaviour as sample A and is given in Fig. S1 in the supplementary information.


Angle-dependent magnetotransport in GaAs/InAs core/shell nanowires.

Haas F, Wenz T, Zellekens P, Demarina N, Rieger T, Lepsa M, Grützmacher D, Lüth H, Schäpers T - Sci Rep (2016)

Magnetoconductance of nanowire A at different angles γ with respect to the magnetic field direction as defined in Fig. 1(e).The curves are offset by ΔG = 0.25 e2/h for clarity. A dotted guideline is provided to help separating the tilt ranges described in the text. For small tilt angles Aharonov–Bohm type oscillations are clearly visible, while for larger tilt angles an UCF pattern dominates the signal.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835758&req=5

f3: Magnetoconductance of nanowire A at different angles γ with respect to the magnetic field direction as defined in Fig. 1(e).The curves are offset by ΔG = 0.25 e2/h for clarity. A dotted guideline is provided to help separating the tilt ranges described in the text. For small tilt angles Aharonov–Bohm type oscillations are clearly visible, while for larger tilt angles an UCF pattern dominates the signal.
Mentions: Figure 3 shows the magnetoconductance of sample A at selected tilt angles from a nearly parallel orientation of the nanowire axis with the magnetic field (γA = 15°) to a perpendicular oriented field (γA = 90°). The measured curves are all symmetric around zero magnetic field, therefore fulfilling the Onsager symmetry relation expected for two terminal transport. We distinguish two different tilt ranges (separated by the horizontal guideline in Fig. 3), where a clear change of the magnetoconductance signal is observed. The magnetoconductance of sample B is showing a similar behaviour as sample A and is given in Fig. S1 in the supplementary information.

Bottom Line: These are attributed to transport via angular momentum states, formed by electron waves within the InAs shell.Universal conductance fluctuations are observed for all tilt angles, however with increasing amplitudes for large tilt angles.We record this evolution of the electron propagation from a circling motion around the core to a diffusive transport through scattering loops and give explanations for the observed different transport regimes separated by the magnetic field orientation.

View Article: PubMed Central - PubMed

Affiliation: Peter Grünberg Institute 9, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.

ABSTRACT
We study the impact of the direction of magnetic flux on the electron motion in GaAs/InAs core/shell nanowires. At small tilt angles, when the magnetic field is aligned nearly parallel to the nanowire axis, we observe Aharonov-Bohm type h/e flux periodic magnetoconductance oscillations. These are attributed to transport via angular momentum states, formed by electron waves within the InAs shell. With increasing tilt of the nanowire in the magnetic field, the flux periodic magnetoconductance oscillations disappear. Universal conductance fluctuations are observed for all tilt angles, however with increasing amplitudes for large tilt angles. We record this evolution of the electron propagation from a circling motion around the core to a diffusive transport through scattering loops and give explanations for the observed different transport regimes separated by the magnetic field orientation.

No MeSH data available.


Related in: MedlinePlus