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Exact Eigenstates for Repulsive Bosons in Two Dimensions

R A Smith·N K Wilkin
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Abstract

We consider a model of $N$ two-dimensional bosons in a harmonic potential with weak repulsive delta-function interactions. We show analytically that, for angular momentum $L\le N$, the elementary symmetric polynomials of particle coordinates measured from the center of mass are exact eigenstates with energy $N(N-L/2-1)$. Extensive numerical analysis confirms that these are actually the ground states, but we are currently unable to prove this analytically. The special case $L=N$ can be thought of as the generalisation of the usual superfluid one-vortex state to Bose-Einstein condensates in a trap.

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R A Smith, N K Wilkin. 2000-05-14. Exact Eigenstates for Repulsive Bosons in Two Dimensions. https://doi.org/10.1103/physreva.62.061602

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