M.KIM Lab

Quantum Transport in Mesoscopic Device

in Department of Applied Physics, Kyung Hee University

Research topics

Mesoscopic low temperature physics

in two-dimensional materials


  • Topologically protected transport

  • Correlation between electrons

  • Superconducting proximity effect

  • Molecular transport
    in low dimensions

Mesoscopic low temperature physics in two-dimensional materials


Mesoscopic low temperature physics is the study about the semi-classical to quantum phenomena that cannot be described by classical physics. For example, well known 'Ohm's law' does not apply anymore to explain the electrical conductivity of the material, when its dimensions are smaller than the characterisitc length scales such as de Broglie wavelength, mean free path, phase-coherence length, and particle-particle scattering length. In typical materials, those scales are called mesoscopic in the range from few nanometer to hundreds of micrometers that is much larger than microscopic but smaller than macroscopic. Temperature is another important knob for the investigation of the quantum phenomena that appear in the small energy scale.


Two-dimensional (2D) cleavable materials, known as van der Waals materials, have a defect-free crystalline structure that is suitable for use in high-quality quantum devices. It is even possible to obtain a single layer of these materials and build heterostructures exhibiting interesting many-body interaction-induced quantum phenomena, e.g., viscous electron flow and highly correlated states such as superconductivity and ferromagnetism. Moreover, the heterostructure of 2D materials can open up topologically distinct channels with robust transport characteristics and can be utilized to study exotic physical phenomena such as the Majorana fermion, which is identified as its own anti-particle and known to be a building block of topological quantum computation.

Here, in our group, we are interested in the studies of topologcally protected transport properties, correlation between electrons, proximity effects, and molecular transport in low dimensional materials.


References
[1] S. Datta, "Electronic Transport in Mesoscopic Systems", Cambridge University Press (1995)
[2] Novoselov, K. S., et al "2D materials and van der Waals heterostructures." Science 353, 6298 (2016)