Coexistence of Interacting Charge Density Waves in a Layered Semiconductor,Physical Review Letters

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Coexistence of Interacting Charge Density Waves in a Layered Semiconductor
Physical Review Letters ( IF 8.6 ) Pub Date : 2024-05-15 , DOI: 10.1103/physrevlett.132.206401
B. Q. Lv _{1,

2,

3,

4} , Alfred Zong _{2,

5} , Dong Wu ₆ , Zhengwei Nie ₇ , Yifan Su ₂ , Dongsung Choi ₈ , Batyr Ilyas ₂ , Bryan T. Fichera ₂ , Jiarui Li _{9,

10} , Edoardo Baldini ₂ , Masataka Mogi ₂ , Y.-B. Huang ₁₁ , Hoi Chun Po ₁₂ , Sheng Meng ₇ , Yao Wang ₁₃ , N. L. Wang _{6,

14} , Nuh Gedik ₂

Affiliation

Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
Massachusetts Institute of Technology, Department of Physics, Cambridge, Massachusetts 02139, USA
School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, China
University of California at Berkeley, Department of Chemistry, Berkeley, California 94720, USA
Beijing Academy of Quantum Information Sciences, Beijing 100913, China
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, Cambridge, Massachusetts 02139, USA
SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
Department of Applied Physics, Stanford University, Stanford, California 94305, USA
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

Coexisting orders are key features of strongly correlated materials and underlie many intriguing phenomena from unconventional superconductivity to topological orders. Here, we report the coexistence of two interacting charge-density-wave (CDW) orders in

{EuTe}_{4}

, a layered crystal that has drawn considerable attention owing to its anomalous thermal hysteresis and a semiconducting CDW state despite the absence of perfect Fermi surface nesting. By accessing unoccupied conduction bands with time- and angle-resolved photoemission measurements, we find that monolayers and bilayers of Te in the unit cell host different CDWs that are associated with distinct energy gaps. The two gaps display dichotomous evolutions following photoexcitation, where the larger bilayer CDW gap exhibits less renormalization and faster recovery. Surprisingly, the CDW in the Te monolayer displays an additional momentum-dependent gap renormalization that cannot be captured by density-functional theory calculations. This phenomenon is attributed to interlayer interactions between the two CDW orders, which account for the semiconducting nature of the equilibrium state. Our findings not only offer microscopic insights into the correlated ground state of