Report
Emergence and disruption of spin-charge separation in one-dimensional repulsive fermions
| العنوان: | Emergence and disruption of spin-charge separation in one-dimensional repulsive fermions |
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| المؤلفون: | He, Feng, Jiang, Yu-Zhu, Lin, Hai-Qing, Hulet, Randall G., Pu, Han, Guan, Xi-Wen |
| المصدر: | Phys. Rev. Lett. 125, 190401 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Quantum Gases |
| الوصف: | At low temperature, collective excitations of one-dimensional (1D) interacting fermions exhibit spin-charge separation, a unique feature predicted by the Tomonaga-Luttinger liquid (TLL) theory, but a rigorous understanding remains challenging. Using the thermodynamic Bethe Ansatz (TBA) formalism, we analytically derive universal properties of a 1D repulsive spin-1/2 Fermi gas with arbitrary interaction strength. We show how spin-charge separation emerges from the exact TBA formalism, and how it is disrupted by the interplay between the two degrees of freedom which brings us beyond the TLL paradigm. Based on the exact low-lying excitation spectra, we further evaluate the spin and charge dynamical structure factors (DSFs). The peaks of the DSFs exhibit distinguishable propagating velocities of spin and charge as functions of interaction strength, which can be observed by Bragg spectroscopy with ultracold atoms. Comment: 4+4 figures, 6 page+ 14 pages, new results and references were added |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.125.190401 |
| URL الوصول: | http://arxiv.org/abs/2004.12637 |
| رقم الانضمام: | edsarx.2004.12637 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.125.190401 |
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