| Autor: |
Ikeda, Kazuki, Kharzeev, Dmitri E., Meyer, René, Shi, Shuzhe |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Phys. Rev. D 108, L091501, 2023 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevD.108.L091501 |
| Popis: |
Using quantum simulations on classical hardware, we study the phase diagram of the massive Schwinger model with a $\theta$-term at finite chemical potential $\mu$. We find that the quantum critical point in the phase diagram of the model can be detected through the entanglement entropy and entanglement spectrum. As a first step, we chart the phase diagram using conventional methods by computing the dependence of the charge and chiral condensates on the fermion mass $m$, coupling constant $g$, and the chemical potential $\mu$. At zero density, the Schwinger model possesses a quantum critical point at $\theta=\pi$ and $m/g \simeq 0.33$. We find that the position of this quantum critical point depends on the chemical potential. Near this quantum critical point, we observe a sharp maximum in the entanglement entropy. Moreover, we find that the quantum critical point can be located from the entanglement spectrum by detecting the position of the gap closing point. |
| Databáze: |
arXiv |
| Externí odkaz: |
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