Department of Physics, Lancaster University, United Kingdom.
Phys Rev Lett. 2011 Nov 11;107(20):207402. doi: 10.1103/PhysRevLett.107.207402. Epub 2011 Nov 8.
Quantum Monte Carlo calculations of the relaxation energy, pair-correlation function, and annihilating-pair momentum density are presented for a positron immersed in a homogeneous electron gas. We find smaller relaxation energies and contact pair-correlation functions in the important low-density regime than predicted by earlier studies. Our annihilating-pair momentum densities have almost zero weight above the Fermi momentum due to the cancellation of electron-electron and electron-positron correlation effects.
本文介绍了在均匀电子气中，处于束缚态的正电子的弛豫能、对关联函数和湮没对动量密度的量子蒙特卡罗计算。我们发现，在早期研究预测的重要低密度区域，弛豫能和接触对关联函数更小。由于电子-电子和电子-正电子相关效应的抵消，湮没对动量密度在费米动量以上几乎没有权重。
