Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS

• DOI: 10.1038/s42005-022-00980-6
• Publication Date: 2022-08-10T09:02:50Z
• Authors: Yangyang Liu; Gyanendra Dhakal; Anup Pradhan Sakhya; John E. Beetar; Firoza Kabir; Sabin Regmi; Dariusz Kaczorowski; Michael Chini; Benjamin M. Fregoso; Madhab Neupane
• Keywords: Line (geometry)

Abstract Recently, nodal line semimetals based on ZrSiS-family have garnered massive research interests contributing numerous experimental and theoretical works. Despite being the most studied nodal-line semimetal, a clear understanding of transient state relaxation dynamics underlying mechanism in ZrSiS is lacking. Using time- angle-resolved photoemission spectroscopy, we study ultrafast reveal unique bulk which well-captured by simple model optical acoustic phonon cooling. Our predicts linear decay processes for both relaxations with cooling dominant at higher temperatures. results different mechanisms surface states pave way to understand conduction this material.