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Volumn 88, Issue 4, 2013, Pages

Pressure-induced topological phase transitions in rocksalt chalcogenides

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EID: 84883202561     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.88.045207     Document Type: Article
Times cited : (95)

References (42)
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    • Kohn-Sham equations were solved using the projector augmented-wave method. The energy cutoff for the plane-wave expansion was 600 eV; an 8×8×8 Monkhorst-Pack k-point grid was used. Calculations with the hybrid Heyd-Scuseria-Ernzerhof (HSE) functional (Ref.) are computationally very demanding and thus were used for bulk states only.
    • Kohn-Sham equations were solved using the projector augmented-wave method. The energy cutoff for the plane-wave expansion was 600 eV; an 8 × 8 × 8 Monkhorst-Pack k -point grid was used. Calculations with the hybrid Heyd-Scuseria-Ernzerhof (HSE) functional (Ref.) are computationally very demanding and thus were used for bulk states only.
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    • For instance, LDA calculations predicted a negative pressure dependence of the lead chalcogenide band gap, which would suggest an inverted band structure at L. However, GW calculations have shown that this inversion is a spurious outcome of the local approximation for the exchange-correlation potential, which is known to place the conduction band too low in energy (that is, too small a band gap) (Ref.).
    • For instance, LDA calculations predicted a negative pressure dependence of the lead chalcogenide band gap, which would suggest an inverted band structure at L. However, G W calculations have shown that this inversion is a spurious outcome of the local approximation for the exchange-correlation potential, which is known to place the conduction band too low in energy (that is, too small a band gap) (Ref.).
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    • ′).
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    • 0=0.86.
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    • 0=6.39 Å in the VCA. Also on the basis of the smaller critical pressure predicted for PbSe with respect to PbTe, a topological transition is therefore likely to occur at reasonable values of applied pressure.
    • 0 = 6.39 Å in the VCA. Also on the basis of the smaller critical pressure predicted for PbSe with respect to PbTe, a topological transition is therefore likely to occur at reasonable values of applied pressure.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.