Misfit layer compounds, heterostructures composed of a regular alternating stacking of rocksalt monochalcogenide bilayers and few-layer transition-metal dichalcogenides, are an emergent platform to investigate highly doped transition-metal dichalcogenides. Among them, (LaSe)1.14⁢(NbSe2)2 displays Ising superconductivity, while the presence of a charge density wave (CDW) in the material is still under debate. Here, by using polarized Raman spectroscopy and first-principles calculations, we show that NbSe2 undergoes a doping-driven collapse of the CDW ordering within the misfit, and no signature of the CDW is detected down to 8 K. We provide a complete experimental and theoretical description of the lattice dynamics of this misfit compound. We show that the vibrational properties are obtained from those of the two subunits, namely, the LaSe unit and the NbSe2 bilayer, in the presence of a suitable field-effect doping, and then highlight the two-dimensional nature of the lattice dynamics of NbSe2 within the (LaSe)1.14⁢(NbSe2)2 three-dimensional structure.

Charge density wave collapse of of NbSe2 in the (LaSe)1.14(NbSe2)2 misfit layer compound / Zullo, Ludovica; Setnikar, Grégory; Pawbake, Amit; Cren, Tristan; Brun, Christophe; Cordiez, Justine; Sasaki, Shunsuke; Cario, Laurent; Marini, Giovanni; Calandra, Matteo; Méasson, Marie-Aude. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 110:7(2024). [10.1103/physrevb.110.075430]

Charge density wave collapse of of NbSe2 in the (LaSe)1.14(NbSe2)2 misfit layer compound

Zullo, Ludovica;Marini, Giovanni;Calandra, Matteo;
2024-01-01

Abstract

Misfit layer compounds, heterostructures composed of a regular alternating stacking of rocksalt monochalcogenide bilayers and few-layer transition-metal dichalcogenides, are an emergent platform to investigate highly doped transition-metal dichalcogenides. Among them, (LaSe)1.14⁢(NbSe2)2 displays Ising superconductivity, while the presence of a charge density wave (CDW) in the material is still under debate. Here, by using polarized Raman spectroscopy and first-principles calculations, we show that NbSe2 undergoes a doping-driven collapse of the CDW ordering within the misfit, and no signature of the CDW is detected down to 8 K. We provide a complete experimental and theoretical description of the lattice dynamics of this misfit compound. We show that the vibrational properties are obtained from those of the two subunits, namely, the LaSe unit and the NbSe2 bilayer, in the presence of a suitable field-effect doping, and then highlight the two-dimensional nature of the lattice dynamics of NbSe2 within the (LaSe)1.14⁢(NbSe2)2 three-dimensional structure.
2024
7
Zullo, Ludovica; Setnikar, Grégory; Pawbake, Amit; Cren, Tristan; Brun, Christophe; Cordiez, Justine; Sasaki, Shunsuke; Cario, Laurent; Marini, Giovan...espandi
Charge density wave collapse of of NbSe2 in the (LaSe)1.14(NbSe2)2 misfit layer compound / Zullo, Ludovica; Setnikar, Grégory; Pawbake, Amit; Cren, Tristan; Brun, Christophe; Cordiez, Justine; Sasaki, Shunsuke; Cario, Laurent; Marini, Giovanni; Calandra, Matteo; Méasson, Marie-Aude. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 110:7(2024). [10.1103/physrevb.110.075430]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/430410
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
  • OpenAlex ND
social impact