Space charge and screening in bilayer graphene
| Autor: | Kolomeisky, Eugene B., Straley, Joseph P., Abrams, Daniel L. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 28 (2016) 47LT01 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/28/47/47LT01 |
| Popis: | Undoped bilayer graphene is a two-dimensional semimetal with a low-energy excitation spectrum that is parabolic in the momentum. As a result, the screening of an arbitrary external charge $Ze$ is accompanied by a reconstruction of the ground state: valence band electrons (for $Z>0$) are promoted to form a space charge around the charge while the holes leave the physical picture. The outcome is flat neutral object resembling the regular atom except that for $Z \gg 1$ it is described by a strictly linear Thomas-Fermi theory. This theory also predicts that the bilayer's static dielectric constant is the same as that of a two-dimensional electron gas in the long-wavelength limit. Comment: 4+0 pages, 1 figure, minor changes, version to be published as a Letter in JPCM |
| Databáze: | arXiv |
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