Van der Waals Nanowires with Continuously Variable Interlayer Twist and Twist Homojunctions

Sutter, Peter; Idrobo, Juan‐Carlos; Sutter, Eli

doi:10.1002/adfm.202006412

Title: Van der Waals Nanowires with Continuously Variable Interlayer Twist and Twist Homojunctions

Journal Article · Thu Dec 03 00:00:00 EST 2020 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202006412· OSTI ID:1804227

^[1]; Idrobo, Juan‐Carlos ^[2]; Sutter, Eli ^[3]

Department of Electrical &, Computer Engineering University of Nebraska‐Lincoln Lincoln NE 68588 USA
Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
Department of Mechanical &, Materials Engineering University of Nebraska‐Lincoln Lincoln NE 68588 USA

Abstract Moiré patterns at van der Waals interfaces between twisted 2D crystals give rise to distinct optoelectronic excitations, as well as, narrowly dispersive bands responsible for correlated electron phenomena. Contrasting with the conventional, mechanically stacked planar twist moirés, recent work shows twisted van der Waals interfaces spontaneously formed in nanowires of layered crystals, where Eshelby twist due to axial screw dislocations stabilizes a chiral structure with small interlayer rotation. Here, the realization of tunable twist in germanium(II) sulfide (GeS) van der Waals nanowires is reported. Tapered nanowires host continuously variable interlayer twist. Homojunctions between dislocated (chiral) and defect‐free (achiral) segments are obtained by triggering the emission of axial dislocations during growth. Measurements across such junctions, implemented here using local absorption and luminescence spectroscopy, provide a convenient tool for detecting twist effects. The results identify a versatile system for 3D twistronics, probing moiré physics, and for realizing moiré architectures without equivalent in planar systems.

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Sponsoring Organization:: USDOE

OSTI ID:: 1804227

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 31 Journal Issue: 9; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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