تقرير
Polaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity
| العنوان: | Polaron-Depleton Transition in the Yrast Excitations of a One-Dimensional Bose Gas with a Mobile Impurity |
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| المؤلفون: | Yang, Mingrui, Čufar, Matija, Pahl, Elke, Brand, Joachim |
| المصدر: | Condens. Matter 2022, 7(1), 15 |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Quantum Gases, Physics - Computational Physics |
| الوصف: | We present exact numerical data for the lowest-energy momentum eigenstates (yrast states) of a repulsive spin impurity in a one-dimensional Bose gas using full configuration interaction quantum Monte Carlo (FCIQMC). As a stochastic extension to exact diagonalization it is well suited for the study of yrast states of a lattice-renormalized model for a quantum gas. Yrast states carry valuable information about the dynamic properties of slow-moving mobile impurities immersed in a many-body system. Based on the energies and the first and second order correlation functions of yrast states, we identify different dynamical regimes and the transitions between them: The polaron regime, where the impurity's motion is affected by the Bose gas through a renormalized effective mass; a regime of a gray soliton that is weakly correlated with a stationary impurity, and the depleton regime, where the impurity occupies a dark or gray soliton. Extracting the depleton effective mass reveals a super heavy regime where the magnitude of the (negative) depleton mass exceeds the mass of the finite Bose gas. Comment: 22 pages, 8 figures; revised after peer-reviews |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3390/condmat7010015 |
| URL الوصول: | http://arxiv.org/abs/2112.11603 |
| رقم الأكسشن: | edsarx.2112.11603 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3390/condmat7010015 |
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