تقرير
Topological Phase Transition in an Archetypal f-electron Correlated System: Ce
| العنوان: | Topological Phase Transition in an Archetypal f-electron Correlated System: Ce |
|---|---|
| المؤلفون: | Kim, Junwon, Ryu, Dongchoon, Kang, Chang-Jong, Kim, Kyoo, Choi, Hongchul, Nam, T. -S., Min, B. I. |
| المصدر: | Phys. Rev. B 100, 195138 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science |
| الوصف: | A typical f-electron Kondo lattice system Ce exhibits the well-known isostructural transition, the so-called gamma-alpha transition, accompanied by an enormous volume collapse. Most interestingly, we have discovered that a topological-phase transition also takes place in elemental Ce, concurrently with the gamma-alpha transition. Based on the dynamical mean-field theory approach combined with density functional theory, we have unravelled that the non-trivial topology in alpha-Ce is driven by the f-d band inversion, which arises from the formation of coherent 4f band around the Fermi level. We captured the formation of the 4f quasi-particle band that is responsible for the Lifshitz transition and the non-trivial Z2 topology establishment across the phase boundary. This discovery provides a concept of 'topology switch' for topological Kondo systems. The 'on' and 'off' switching knob in Ce is versatile in a sense that it is controlled by available pressure (around 1 GPa) at room temperature. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.100.195138 |
| URL الوصول: | http://arxiv.org/abs/1906.06823 |
| رقم الأكسشن: | edsarx.1906.06823 |
| قاعدة البيانات: | arXiv |
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