Finite size scaling of the time reversal Weyl semimetal model


changan - Posted on 16 November 2015

Project Description: 

Our purpose is to study the disorder effect on the transport properties of the Weyl semimetal. By study the one-parameter scaling of localization length and conductance
in disordered systems, one can find the Metal-insulator transition.
By the finite size scaling theory mentioned above, we want to locate the
Metal-Insulator transition of this time reversal Weyl semimetal model, and get more accurate effect of disorder on the transport properties and surface states.

Researcher name: 
Shunqing Shen
Researcher position: 
Professor
Researcher department: 
Department of Physics
Researcher email: 
Researcher name: 
Li Jian
Researcher position: 
Postdoc.
Researcher department: 
Department of Physics
Researcher email: 
Researcher name: 
Li Changan
Researcher position: 
PhD
Researcher department: 
Department of Physics
Researcher email: 
Research Project Details
Project Duration: 
December, 2015- December,2016
Project Significance: 
By this finite size scaling theory and Green's function technique, We can locate the critical transition point clearly, which can give us better understanding of the properties of the Weyl semimetal under the effectof disorder and also instruction for experiments.
Results Achieved: 
Now we have primarily locate the metal-insulator transition, but we need more data to confirm. If this project finished, we hope to publish on a journal(e.g. PRB). There are some recent related work done in this field as follows: 1,K. Ziegler, Quantum transport in 3D Weyl semimetals:Is there a metal-insulator transition? Arxiv 1501. 00268. 2, S. Das Sarma etc. Anderson localization and the quantum phase diagram of three dimensional Dirac semimetal, Phys. Rev. Lett. 115, 076601 (2015) 3, Soumya Bera, Jay D. Sau and Bitan Roy. Dirty Weyl semimetals: stability, phase transition and quantum criticality.arXiv:1507.07551. 4, Hassan Shapourian and Taylor L. Hughes. Phase diagrams of disordered Weyl semimetals arXiv:1509.02933. These related paper focus on the Dirac semimetal and the Weyl semimetal that breaks the time reversal symmetry. Here we care the disorder effect on the surface states of the time reversal invariant Weyl semimetal.
Remarks: 
1, As we know, for the disordered system, we use mathematical model to put the disorder in the system. We have to do the statistical average on disorder configuration, that is we have to calculate as many times(e.g 100000times) as possible to make the result converge and the errors small, this process is very time consuming. 2, Second, the result accuracy is affected by the size of the system, so we hope the system the bigger, the better. But as the size increases, the computation becomes more difficult since it is proportional to N=
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