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Title: Delocalized polaron and Burstein-Moss shift induced by Li in α–V2O5: A DFT + DMFT study

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [1];  [2];  [1]
  1. Univ. of Illinois, Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United States)

For this work, we performed density functional theory (DFT)+U and dynamical mean field theory (DMFT) calculations with a continuous-time quantum Monte Carlo impurity solver to investigate the electronic properties of V2O5 and LixV2O5 (x = 0.125 and 0.25). Pristine V2O5 is a charge-transfer insulator with strong O p–V d hybridization, and it exhibits a large band gap (Egap) as well as a nonzero conduction-band (CB) gap.We show that the band gap, the number of d electrons of vanadium, Nd, and the CB gap for V2O5 obtained from our DMFT calculations are in excellent agreement with the experimental values. While the DFT +U approach replicates the experimental band gap, it overestimates the value of Nd and underestimates the CB gap. In the presence of low Li doping, the electronic properties of V2O5 are mainly driven by a polaronic mechanism, and electron spin resonance and electron nuclear double resonance spectroscopies observed the coexistence of free and bound polarons. Notably, our DMFT results identify both polaron types, with the bound polaron being energetically preferred, while the DFT +U method only predicts the free polaron. Our DMFT analysis also reveals that increased Li doping leads to electron filling in the conduction band, shifting the Fermi level. This result is consistent with the observed Burstein-Moss shift upon enhanced Li doping, and we thus demonstrate that the DFT + DMFT approach can be used for an accurate and realistic description of strongly correlated materials.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2246585
Journal Information:
Physical Review. B, Vol. 108, Issue 20; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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