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Entanglement Entropy with Lifshitz Fermions
by Dion Hartmann, Kevin Kavanagh, Stefan Vandoren
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Submission summary
Authors (as registered SciPost users):  Dion Hartmann · Kevin Kavanagh · Stefan Vandoren 
Submission information  

Preprint Link:  https://arxiv.org/abs/2104.10913v3 (pdf) 
Date accepted:  20210723 
Date submitted:  20210706 07:35 
Submitted by:  Hartmann, Dion 
Submitted to:  SciPost Physics 
Ontological classification  

Academic field:  Physics 
Specialties: 

Approach:  Theoretical 
Abstract
We investigate fermions with Lifshitz scaling symmetry and study their entanglement entropy in 1+1 dimensions as a function of the scaling exponent $z$. Remarkably, in the ground state the entanglement entropy vanishes for even values of $z$, whereas for odd values it is independent of $z$ and equal to the relativistic case with $z=1$. We show this using the correlation method on the lattice, and also using a holographic cMERA approach. The entanglement entropy in a thermal state is a more detailed function of $z$ and $T$ which we plot using the lattice correlation method. The dependence on the even or oddness of $z$ still shows for small temperatures, but is washed out for large temperatures or large values of $z$.
List of changes
1. In the introduction between equations 1 and 2 we added a sentence to clarify issues regarding noninteger z.
2. We fixed typos in the caption of figure 1.
3. We fixed a typo on page 3. We fixed a typo in equation 13.
4. We fixed a missing factor i in equation 18.
5. We fixed a typo in eq 25. We fixed a typo below eq 26. We fixed a typo above eq 37.
6. We added three sentences to the paragraph after equation 37 to remark the universality of a result with respect to the partitioning of our system.
7. We fixed a typo in the caption of figure 2.
8. We fixed a typo in the axis labels of figure 3.
9. We added two sentences to the first paragraph of section 4 to remark other approaches not taken in the present paper.
10. We added equation 46 and two remarks just before it to clarify on the derivation of g.
11. We added some clarifying remarks below equation 53 and refer to the appendix to be more selfcontained with regards to the derivation of g.
12. We added a clarification regarding the geodesic above equation 62.
13. We fixed a typo in the last sentence of section 4.
14. We added a remark to the first paragraph of section 5 highlighting again the universality with respect to the partitioning.
15. We added an appendix to be more selfcontained with regards to the derivation of g.
16. We abbreviated several occurences of entanglement entropy to EE.
Published as SciPost Phys. 11, 031 (2021)