Main Focus

Physics: excitonic insulator

I do believe in "more is difference" since the statistic physics lectures. Macroscopic number of Ising spins (>2D) give an order as temperature decreases. Collective motion of macroscopic number of atom in a solid gives rise to phonon. Spontaneous condensation of macroscopic number of Cooper pair gives rise to superconductor. What about a spontaneous formation of macroscopic number of electron-hole pair? The answer can be referred to the so-called excitonic insulator. 


(1)Transport measurements (i.e., electrical and thermal transport) 

Thermal transport not only allows us to detect scattering mechanisms of quasi-particles in a system, but also offers us an opportunity to capture the existence of neutral particles (e.g., exciton). Together with other low temperature transport techniques, we are able to explore the fantastic quasi-particles' world.

(2)Dimension reduction

Thinning a Van der Waals 2D material (e.g., transition metal chalcogenides) down to several layers (e.g., monolayer etc) offers us not only a new world of physics, but also many possibilities to see efficient responses of a system to varied parameters.


Curriculum Vitae


2012.09~2016.07: Bachelor. Physics Department, Tsinghua University, P. R. of China.

2017.06~now: Max Planck Institute for Solid State Research, Germany


2015.12~2017.05: Spin and valley transport in honeycomb 2D materials (i.e., silicene).

2017.06~2020.10: High temperature thermal transport of excitonic insulator candidate Ta2NiSe5.

Reference: Y.-S. Zhang, J. A. N. Bruin, Y. Matsumoto, M. Isobe, H. Takagi, Physical Review B 104 (12), L121201(2021)

2020.11~now: Low dimensional effects of correlated electron system.

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