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Unified Assessment of the Effects of Van der Waals Interactions on the Structural and Electronic Properties of Some Layered Organic Solids kappa-(BEDT-TTF)2X


Lazić, Predrag; Milat, Ognjen; Gumhalter, Branko; Tomić, Silvia
Unified Assessment of the Effects of Van der Waals Interactions on the Structural and Electronic Properties of Some Layered Organic Solids kappa-(BEDT-TTF)2X // Crystals, 9 (2019), 7; 348, 14 doi:10.3390/cryst9070348 (međunarodna recenzija, članak, znanstveni)


Naslov
Unified Assessment of the Effects of Van der Waals Interactions on the Structural and Electronic Properties of Some Layered Organic Solids kappa-(BEDT-TTF)2X

Autori
Lazić, Predrag ; Milat, Ognjen ; Gumhalter, Branko ; Tomić, Silvia

Izvornik
Crystals (2073-4352) 9 (2019), 7; 348, 14

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Mott insulators ; quantum spin liquid ; strongly correlated systems ; density functional theory

Sažetak
Proper inclusion of van der Waals interactions (vdW) in ab initio calculations based on the density functional theory (DFT) is crucial to describe soft, organic, layered solids such as κ -(BEDT-TTF) 2X . Since no consensus has been reached on the reliability of available vdW DFT functionals, most of the first principles calculations have been based on experimental crystal structure data without any structural optimization. Here, we explore optimal DFT-based schemes that account for the effects of vdW interactions on the structural and electronic band properties of three paradigmatic charge transfer salts, κ -(BEDT-TTF) 2 Cu 2 (CN) 3 , κ -(BEDT-TTF) 2 Ag 2 (CN) 3 , and κ -(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl, for which a unified optimization of the structure is possible. Detailed examination of the prototype test system κ -(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl shows that the optB88-vdW functional performs slightly better than the PBE-vdW and that the choice of pseudopotentials is critical to obtaining realistic results.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Center of Excellence for Advanced Materials and Sensing Devices (ERDF Grant No. KK.01.1.1.01.0001).



POVEZANOST RADA


Projekt / tema
EK-H2020-692194 (Fabrizio NESTI, EK - H2020-TWINN-2015)
KK.01.1.1.01.0001

Ustanove
Institut za fiziku, Zagreb,
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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