التفاصيل البيبلوغرافية
| العنوان: |
Phononic soft mode behavior and a strong electronic background across the structural phase transition in the excitonic insulator Ta_{2}NiSe_{5} |
| المؤلفون: |
Min-Jae Kim, Armin Schulz, Tomohiro Takayama, Masahiko Isobe, Hidenori Takagi, Stefan Kaiser |
| المصدر: |
Physical Review Research, Vol 2, Iss 4, p 042039 (2020) |
| بيانات النشر: |
American Physical Society, 2020. |
| سنة النشر: |
2020 |
| المجموعة: |
LCC:Physics |
| مصطلحات موضوعية: |
Physics, QC1-999 |
| الوصف: |
Ta_{2}NiSe_{5} became one of the most investigated candidate materials for hosting an excitonic insulator ground state. Many studies describe the corresponding phase transition as a condensation of excitons breaking a continuous symmetry. This view got challenged recently pointing out the importance of the loss of two mirror symmetries at a structural phase transition that occurs together with the semiconductor—excitonic insulator transition. For such a scenario an unstable optical zone-center phonon at low energy is proposed to drive the transition. Here we report on the experimental observation of such a soft mode behavior using Raman spectroscopy. In addition we find a novel spectral feature, likely of electronic or joint electronic and phononic origin, that is clearly distinct from the lattice dynamics and that becomes dominant at T_{c}. This suggests a picture of joint structural and electronic orders driving the phase transition. |
| نوع الوثيقة: |
article |
| وصف الملف: |
electronic resource |
| اللغة: |
English |
| تدمد: |
2643-1564 |
| Relation: |
https://doaj.org/toc/2643-1564 |
| DOI: |
10.1103/PhysRevResearch.2.042039 |
| URL الوصول: |
https://doaj.org/article/619e2f6ff57a4e98bb67a4dacfe20f53 |
| رقم الانضمام: |
edsdoj.619e2f6ff57a4e98bb67a4dacfe20f53 |
| قاعدة البيانات: |
Directory of Open Access Journals |