journal article·2025-01Open access

Nanometer‐Scale 1D Negative Differential Resistance Channels in Van Der Waals Layers

Qirong Yao, Jae Whan Park, Choongjae Won, Sang‐Wook Cheong, Han Woong Yeom

Advanced Science· Volume 12· Issue 2

Abstract

Abstract Negative differential resistance (NDR) is the key feature of resonant tunneling diodes exploited for high‐frequency and low‐power devices and recent studies have focused on NDR in van der Waals heterostructures and nanoscale materials. Here, strong NDR confined along a 1‐nm‐wide 1D channel within a van der Waals layer 1T‐TaS2 is reported. Using scanning tunneling microscopy, a double 1D NDR channel formed along the sides of a charge–density‐wave domain wall of 1T‐TaS2 is found. The density functional theory calculation elucidates that the strong local band‐bending at the domain wall and the interlayer orbital overlap cooperate to bring about 1D NDR channels. Furthermore, the NDR is well controlled by changing the tunneling junction distance. This result would be important for nanoscale device applications based on strong nonlinear resistance within van der Waals material architectures.
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Research context

OpenAlex topics: Semiconductor materials and devices · Quantum and electron transport phenomena · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science (IBS) Pohang 37673 South Korea

Laboratory for Pohang Emergent Materials Department of Physics Pohang University of Science and Technology Pohang 37673 South Korea

Max Plank Pohang University of Science and Technology (POSTECH) Center for Complex Phase Materials Pohang University of Science and Technology Pohang 37673 South Korea

Rutgers Center for Emergent Materials and Department of Physics and Astronomy Rutgers University Piscataway NJ 08854‐8019 USA

Department of Physics Pohang University of Science and Technology Pohang 37673 South Korea

Funding

Institute for Basic Science

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