Year: 2026
Type: preprint
Abstract: We investigate coherent quantum transport through silicon nanotube (SiNT) junctions in high magnetic fields up to 60 T using a tight-binding model combined with the non-equilibrium Green's function formalism, and magnetic field included via Peierls substitution. We consider junctions of metallic nanotubes (6,0)+(6,0) and semiconducting ones (9,9)+(9,9), and examine the effects of the overlap length, inter-tube distance, magnetic-field direction, and field strength on the electronic transmission. In contrast to carbon nanotube junctions, the SiNT systems exhibit irregular transmission oscillations and do not show the emergence of highly conductive gateway states. The transmission is substantially more sensitive to a magnetic field perpendicular to the nanotube axis than to a parallel field, while increasing the field strength progressively modifies the transmission spectrum. Increasing the overlap length results in more frequent transmission oscillations, whereas increasing the inter-tube distance modifies their positions and amplitudes without changing their overall character. Generally, similar trends are observed for both types of junctions, involving metallic and semiconducting nanotubes. However, in the junction of semiconducting nanotubes, one observes peculiar additional field-dependent in-gap transmission features. These results demonstrate that the magnetic-field response of SiNT junctions is strongly governed by their geometry and differs qualitatively from that of pristine carbon nanotube junctions.
Source: arXiv (Cornell University)
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Centres de Recerca de Catalunya, Institut Català de Nanociència i Nanotecnologia, European Commission, Fundacja na rzecz Nauki Polskiej, Generalitat de Catalunya, Ministerio de Ciencia e Innovación, Uniwersytet Warszawski, Horizon 2020 Framework Programme, Agencia Estatal de Investigación, European Social Fund
Awards: G1119546765, G1206670709, G121809054, G1238858437, G1401168639, G1855990336, G2064873908, G2309174360, G2344088346, G2389362135, G2402982190, G2459276955, G2462415295, Attracting Postdoctoral Researchers in any Research Field to the Basque Country, G2660406951, G279363373, G3005324705, G3345895242, G3518538256, G3546882995, G354764522, G3859414071, G38946076, G4228227490, G430777504, G442103306, G5195188938, G5421974903, MAterials design at the eXascale, G546199279, G548787232, G6011688299, G6218905885, G6605876378, G6656126374, G6762955466, G69051668, G7169023097, G751615522, G8078497566, G8476680135, G8575141037, G8637226926, G8888022036, G8920660035, G897484643, G99296377
OpenAlex ID: W7214342492