### Abstract

We conduct a theoretical study of SU(N) fermions confined by a one-dimensional harmonic potential. First, we introduce a numerical approach for solving the trapped interacting few-body problem, by which one may obtain accurate energy spectra across the full range of interaction strengths. In the strong-coupling limit, we map the SU(N) Hamiltonian to a spin-chain model. We then show that an existing, extremely accurate ansatz-derived for a Heisenberg SU(2) spin chain-is extendable to these N-component systems. Lastly, we consider balanced SU(N) Fermi gases that have an equal number of particles in each spin state for N=2,3,4. In the weak-and strong-coupling regimes, we find that the ground-state energies rapidly converge to their expected values in the thermodynamic limit with increasing atom number. This suggests that the many-body energetics of N-component fermions may be accurately inferred from the corresponding few-body systems of N distinguishable particles.

Original language | English |
---|---|

Article number | 032701 |

Number of pages | 13 |

Journal | Physical Review A |

Volume | 96 |

Issue number | 3 |

DOIs | |

Publication status | Published - 1 Sep 2017 |

### Cite this

*Physical Review A*,

*96*(3), [032701]. https://doi.org/10.1103/PhysRevA.96.032701

}

*Physical Review A*, vol. 96, no. 3, 032701. https://doi.org/10.1103/PhysRevA.96.032701

**SU(N) fermions in a one-dimensional harmonic trap.** / Laird, E. K.; Shi, Z. Y.; Parish, M. M.; Levinsen, J.

Research output: Contribution to journal › Article › Research › peer-review

TY - JOUR

T1 - SU(N) fermions in a one-dimensional harmonic trap

AU - Laird, E. K.

AU - Shi, Z. Y.

AU - Parish, M. M.

AU - Levinsen, J.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - We conduct a theoretical study of SU(N) fermions confined by a one-dimensional harmonic potential. First, we introduce a numerical approach for solving the trapped interacting few-body problem, by which one may obtain accurate energy spectra across the full range of interaction strengths. In the strong-coupling limit, we map the SU(N) Hamiltonian to a spin-chain model. We then show that an existing, extremely accurate ansatz-derived for a Heisenberg SU(2) spin chain-is extendable to these N-component systems. Lastly, we consider balanced SU(N) Fermi gases that have an equal number of particles in each spin state for N=2,3,4. In the weak-and strong-coupling regimes, we find that the ground-state energies rapidly converge to their expected values in the thermodynamic limit with increasing atom number. This suggests that the many-body energetics of N-component fermions may be accurately inferred from the corresponding few-body systems of N distinguishable particles.

AB - We conduct a theoretical study of SU(N) fermions confined by a one-dimensional harmonic potential. First, we introduce a numerical approach for solving the trapped interacting few-body problem, by which one may obtain accurate energy spectra across the full range of interaction strengths. In the strong-coupling limit, we map the SU(N) Hamiltonian to a spin-chain model. We then show that an existing, extremely accurate ansatz-derived for a Heisenberg SU(2) spin chain-is extendable to these N-component systems. Lastly, we consider balanced SU(N) Fermi gases that have an equal number of particles in each spin state for N=2,3,4. In the weak-and strong-coupling regimes, we find that the ground-state energies rapidly converge to their expected values in the thermodynamic limit with increasing atom number. This suggests that the many-body energetics of N-component fermions may be accurately inferred from the corresponding few-body systems of N distinguishable particles.

UR - http://www.scopus.com/inward/record.url?scp=85029603900&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.96.032701

DO - 10.1103/PhysRevA.96.032701

M3 - Article

VL - 96

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 3

M1 - 032701

ER -