Coulomb interactions and screening effects in few-layer black phosphorus: a tight-binding consideration beyond the long-wavelength limit / Prishchenko D. A.,Mazurenko V. G.,Katsnelson M. I.,Rudenko A. N. // 2D MATERIALS. - 2017. - V. 4, l. 2.

ISSN/EISSN:

2053-1583 / нет данных

Type:

Article

Abstract:

Coulomb interaction and its screening play an important role in many physical phenomena of materials ranging from optical properties to many-body effects including superconductivity. Here, we report on a systematic study of dielectric screening in few-layer black phosphorus (BP), a two-dimensional material with promising electronic and optical characteristics. We use a combination of a tight-binding model and rigorously determined bare Coulomb interactions, which allows us to consider relevant microscopic effects beyond the long-wavelength limit. We calculate the dielectric function of few-layer BP in the random phase approximation and show that it exhibits strongly anisotropic behavior even in the static limit. We also estimate the strength of effective local and non-local Coulomb interactions and determine their doping dependence. We find that the p(z) states responsible for low-energy excitations in BP provide a moderate contribution to the screening, weakening the on-site Coulomb interaction by less that a factor of two. Finally, we calculate the full plasmon spectrum of few-layer BP and discuss the effects beyond long-wavelengths.

Author keywords:

black phosphorus; dielectric screening; Coulomb interaction; plasmons; tight-binding model LOCALIZED WANNIER FUNCTIONS; MOBILITY; EXCITATIONS

DOI:

10.1088/2053-1583/aa676b

Web of Science ID:

ISI:000398424400011

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN
Publisher	IOP PUBLISHING LTD
Address	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	025064
Keywords-Plus	LOCALIZED WANNIER FUNCTIONS; MOBILITY; EXCITATIONS
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Multidisciplinary
Author-Email	a.rudenko@science.ru.nl
ResearcherID-Numbers	Katsnelson, Mikhail/D-4359-2012
Funding-Acknowledgement	grant program of the Russian Science Foundation {[}15-12-20021]; European Union's Horizon Programme {[}696656]
Funding-Text	The work was supported by the grant program of the Russian Science Foundation 15-12-20021. Funding from the European Union's Horizon 2020 Programme under Grant No. 696656 Graphene Core1 is also gratefully acknowledged.
Number-of-Cited-References	47
Usage-Count-Last-180-days	12
Usage-Count-Since-2013	22
Journal-ISO	2D Mater.
Doc-Delivery-Number	EQ9SH