4.6 Article

One-dimensional excitons in long phosphorene atomic chains

期刊

PHYSICAL REVIEW B
卷 105, 期 24, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.245416

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  1. National Natural Science Foundation of China [12074078]

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The electronic structure of phosphorene atomic chains embedded in different dielectric environments is theoretically studied using a configuration interaction method. It is found that, in addition to the expected scaling law of L², the quasiparticle shift and exciton binding energies follow certain scaling laws, with the former converging to a value independent of the dielectric environment as the length of the atomic chains increases.
The electronic structure of phosphorene atomic chains (PACs) embedded in various dielectric environments is studied theoretically by using a configuration interaction approach beyond the conventional double-excitation scheme. While the nominal single-particle gap of the PACs is shown to roughly obey an expected scaling law of L???2, where L measures the length of PACs, the quasiparticle shift is found to gradually converge to a value that is insensitive to the dielectric environment as L increases. In the meantime, exciton binding energies are revealed to obey a simple scaling law of 0.96/(??L) ??? 0.02, with ?? being the effective dielectric constant. As L goes to infinity, the quasiparticle and excitonic effect are both found to be greatly suppressed as if the long-range electron-electron interactions are quenched in long PACs.

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