### Abstract

Path integral Monte Carlo (PIMC) simulations are employed to calculate the momentum distribution of the homogeneous electron gas at finite temperature. Open paths are introduced to sample off-diagonal elements of the real-space density matrix. It is demonstrated how the restricted PIMC method can be extended to incorporate open paths in order to allow for the simulations in fermionic systems where a sign problem is present. The computed momentum distribution shows significant deviations from behavior of free fermions when strong correlations are present but agrees with predictions from variational methods.

Original language | English (US) |
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Pages (from-to) | 13-20 |

Number of pages | 8 |

Journal | High Energy Density Physics |

Volume | 30 |

DOIs | |

State | Published - Jan 2019 |

### Keywords

- Dense plasmas
- First-principles simulations
- Momentum distributions
- Path integral Monte Carlo

### ASJC Scopus subject areas

- Radiation
- Nuclear and High Energy Physics

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## Cite this

Militzer, B., Pollock, E. L., & Ceperley, D. M. (2019). Path integral Monte Carlo calculation of the momentum distribution of the homogeneous electron gas at finite temperature.

*High Energy Density Physics*,*30*, 13-20. https://doi.org/10.1016/j.hedp.2018.12.004