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Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2
Ying Xing1,2,3, Kun Zhao4,3, Pujia Shan1,3
1International Center for Quantum Materials, School of Physics, Peking University , Beijing 100871, China.
Nano Letters
|October 3, 2017
Summary
Atomically flat monolayer niobium diselenide (NbSe2) films were grown using molecular beam epitaxy. These 2D films exhibit superconductivity above 6 K and quantum Griffiths singularity.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanoscience
Background:
- Two-dimensional (2D) transition metal dichalcogenides (TMDs) offer unique physical properties for advanced electronic and quantum devices.
- While mechanical exfoliation is simple, large-area, high-quality films are crucial for applications.
- Monolayer TMDs exhibit exotic properties due to quantum confinement and symmetry breaking.
Purpose of the Study:
- To prepare macro-size, atomically flat monolayer niobium diselenide (NbSe2) films.
- To investigate the superconducting properties of these 2D NbSe2 films.
- To explore exotic quantum phenomena in monolayer NbSe2.
Main Methods:
- Molecular beam epitaxy (MBE) for film growth.
- Growth on bilayer graphene terminated 6H-SiC(0001) substrates.
- Superconducting and transport measurements at low temperatures and high magnetic fields.
Main Results:
- Successfully synthesized macro-size, atomically flat monolayer NbSe2 films.
- Observed superconducting critical transition temperature (Tc onset) above 6 K and (Tc zero) up to 2.40 K.
- Demonstrated Zeeman-protected Ising superconductivity and quantum Griffiths singularity (QGS).
Conclusions:
- MBE enables the growth of high-quality, large-area 2D NbSe2 films.
- Monolayer NbSe2 exhibits robust superconductivity and unique quantum phenomena.
- These findings pave the way for 2D material-based quantum devices.
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