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Gate-tunable quantum dot formation between localized-resonant states in a few-layer MoS2
Bum-Kyu Kim1, Dong-Hwan Choi1,2, Byung-Sung Yu1,2
1Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
Nanotechnology
|February 2, 2021
Summary
We demonstrate a gate-tunable quantum dot in few-layer molybdenum disulfide (MoS2). This quantum dot
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Engineering
Background:
- Few-layer molybdenum disulfide (MoS2) is a promising material for nanoscale electronic devices.
- Quantum dots (QDs) are crucial for quantum information processing and advanced electronics.
- Controlling QD properties with external gates is essential for device functionality.
Purpose of the Study:
- To demonstrate a gate-tunable quantum dot (QD) in a few-layer MoS2 system.
- To investigate the electronic transport properties of the designed QD.
- To show tunability of the QD's charging energy.
Main Methods:
- Fabrication of a device with a few-layer MoS2 channel and potential barriers.
- Utilizing local gates to define and tune the quantum dot.
- Measuring electrical transport through the device to observe resonant tunneling phenomena.
Main Results:
- Observation of diagonal current stripes, indicating the presence of a gate-tunable QD.
- Evidence of resonant tunneling through the QD, confirmed by Fermi level alignment.
- Demonstrated tunability of the QD's charging energy (2-6 meV) with gate voltages (~1 V).
Conclusions:
- A gate-tunable quantum dot has been successfully realized in few-layer MoS2.
- The device shows potential for applications in quantum electronics and spintronics.
- Gate control over QD charging energy is achieved, paving the way for tailored quantum devices.
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