1
|
Talwar DN. Impact of stacking sequence on the tight-binding electronic band structures of (BeX)m/(ZnX)m, X = S, Se and Te superlattices. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
2
|
Shoker MB, Pagès O, Torres VJB, Polian A, Itié JP, Pradhan GK, Narayana C, Rao MN, Rao R, Gardiennet C, Kervern G, Strzałkowski K, Firszt F. Phonon-based partition of (ZnSe-like) semiconductor mixed crystals on approach to their pressure-induced structural transition. Sci Rep 2020; 10:19803. [PMID: 33188245 PMCID: PMC7666148 DOI: 10.1038/s41598-020-76509-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/22/2020] [Indexed: 11/09/2022] Open
Abstract
The generic 1-bond → 2-mode "percolation-type" Raman signal inherent to the short bond of common A1-xBxC semiconductor mixed crystals with zincblende (cubic) structure is exploited as a sensitive "mesoscope" to explore how various ZnSe-based systems engage their pressure-induced structural transition (to rock-salt) at the sub-macroscopic scale-with a focus on Zn1-xCdxSe. The Raman doublet, that distinguishes between the AC- and BC-like environments of the short bond, is reactive to pressure: either it closes (Zn1-xBexSe, ZnSe1-xSx) or it opens (Zn1-xCdxSe), depending on the hardening rates of the two environments under pressure. A partition of II-VI and III-V mixed crystals is accordingly outlined. Of special interest is the "closure" case, in which the system resonantly stabilizes ante transition at its "exceptional point" corresponding to a virtual decoupling, by overdamping, of the two oscillators forming the Raman doublet. At this limit, the chain-connected bonds of the short species (taken as the minor one) freeze along the chain into a rigid backbone. This reveals a capacity behind alloying to reduce the thermal conductivity as well as the thermalization rate of photo-generated electrons.
Collapse
Affiliation(s)
- M B Shoker
- Université de Lorraine, LCP-A2MC, ER 4632, 57000, Metz, France
| | - Olivier Pagès
- Université de Lorraine, LCP-A2MC, ER 4632, 57000, Metz, France.
| | - V J B Torres
- Departamento de Fisica and I3N, Universidade de Aveiro, 3810-193, Aveiro, Portugal
| | - A Polian
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université-UMR CNRS 7590, 75005, Paris, France.,Synchrotron SOLEIL, L'Orme Des Merisiers Saint-Aubin, BP 48, 91192, Gif-sur-Yvette Cedex, France
| | - J-P Itié
- Synchrotron SOLEIL, L'Orme Des Merisiers Saint-Aubin, BP 48, 91192, Gif-sur-Yvette Cedex, France
| | - G K Pradhan
- Department of Physics, School of Applied Sciences, KIIT Deemed to be University, Bhubaneswar, Odisha, 751024, India
| | - C Narayana
- Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore, 560064, India
| | - M N Rao
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - R Rao
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - C Gardiennet
- Laboratoire de Cristallographie, Résonance Magnétique Et Modélisations, UMR 7036, Université de Lorraine, 54506, Vandoeuvre-lès-Nancy, France
| | - G Kervern
- Laboratoire de Cristallographie, Résonance Magnétique Et Modélisations, UMR 7036, Université de Lorraine, 54506, Vandoeuvre-lès-Nancy, France
| | - K Strzałkowski
- Institute of Physics, N. Copernicus University, 87-100, Toruń, Poland
| | - F Firszt
- Institute of Physics, N. Copernicus University, 87-100, Toruń, Poland
| |
Collapse
|