Mermin-Wagner Theorem, Flexural Modes, and Degraded Carrier Mobility in Two-Dimensional Crystals with Broken Horizontal Mirror Symmetry
| dc.contributor.ORCID | 0000-0001-5926-0200 (Fischetti, MV) | en_US |
| dc.contributor.VIAF | 21146635654041982414 (Vandenberghe, WG) | en_US |
| dc.contributor.author | Fischetti, Massimo V. | en_US |
| dc.contributor.author | Vandenberghe, William G. | en_US |
| dc.contributor.utdAuthor | Fischetti, Massimo V. | |
| dc.contributor.utdAuthor | Vandenberghe, William G. | |
| dc.date.accessioned | 2018-06-01T16:37:32Z | |
| dc.date.available | 2018-06-01T16:37:32Z | |
| dc.date.created | 2016-04-11 | |
| dc.date.issued | 2016-04-11 | en_US |
| dc.description.abstract | We show that the electron mobility in ideal, free-standing two-dimensional "buckled" crystals with broken horizontal mirror (σ_h) symmetry and Dirac-like dispersion (such as silicene and germanene) is dramatically affected by scattering with the acoustic flexural modes (ZA phonons). This is caused both by the broken σ_h symmetry and by the diverging number of long-wavelength ZA phonons, consistent with the Mermin-Wagner theorem. Non-{σ_h}-symmetric, "gapped" 2D crystals (such as semiconducting transition-metal dichalcogenides with a tetragonal crystal structure) are affected less severely by the broken σ_h symmetry, but equally seriously by the large population of the acoustic flexural modes. We speculate that reasonable long-wavelength cutoffs needed to stabilize the structure (finite sample size, grain size, wrinkles, defects) or the anharmonic coupling between flexural and in-plane acoustic modes (shown to be effective in mirror-symmetric crystals, like free-standing graphene) may not be sufficient to raise the electron mobility to satisfactory values. Additional effects (such as clamping and phonon stiffening by the substrate and/or gate insulator) may be required. | en_US |
| dc.description.sponsorship | Nanoelectronics Research Initiative/South West Academy of Nanoelectronics (SRC/NRI Theme 2400.011) grant | en_US |
| dc.identifier.bibliographicCitation | Fischetti, Massimo V., and William G. Vandenberghe. 2016. "Mermin-Wagner theorem, flexural modes, and degraded carrier mobility in two-dimensional crystals with broken horizontal mirror symmetry." Physical Review B 93(15), doi: 10.1103/PhysRevB.93.155413 | en_US |
| dc.identifier.issn | 2469-9950 | en_US |
| dc.identifier.issue | 15 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10735.1/5823 | |
| dc.identifier.volume | 93 | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Amer Physical Soc | en_US |
| dc.relation.uri | http://dx.doi.org/10.1103/PhysRevB.93.155413 | en_US |
| dc.rights | ©2016 American Physical Society. All Rights Reserved. | en_US |
| dc.source.journal | Physical Review B | en_US |
| dc.subject | Field-effect transistors | en_US |
| dc.subject | Quantum wells | en_US |
| dc.subject | Dimensions | en_US |
| dc.subject | Semiconductors | en_US |
| dc.subject | Phonons | en_US |
| dc.title | Mermin-Wagner Theorem, Flexural Modes, and Degraded Carrier Mobility in Two-Dimensional Crystals with Broken Horizontal Mirror Symmetry | en_US |
| dc.type.genre | article | en_US |