Two-dimensional excitons in three-dimensional hexagonal boron nitride

被引：77
作者：
Cao, X. K. [1 ]
Clubine, B. [2 ]
Edgar, J. H. [2 ]
Lin, J. Y. [1 ]
Jiang, H. X. [1 ]
机构：
[1] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA
[2] Kansas State Univ, Dept Chem Engn, Manhattan, KS 66506 USA
来源：
APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 19期
关键词：
CHEMICAL-VAPOR-DEPOSITION; ATMOSPHERIC-PRESSURE; SINGLE-CRYSTALS; GRAPHENE; HETEROSTRUCTURES; EMISSION; SOLVENT;
D O I：
10.1063/1.4829026
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The recombination processes of excitons in hexagonal boron nitride (hBN) have been probed using time-resolved photoluminescence. It was found that the theory for two-dimensional (2D) exciton recombination describes well the exciton dynamics in three-dimensional hBN. The exciton Bohr radius and binding energy deduced from the temperature dependent exciton recombination lifetime is around 8 angstrom and 740 meV, respectively. The effective masses of electrons and holes in 2D hBN deduced from the generalized relativistic dispersion relation of 2D systems are 0.54m(o), which are remarkably consistent with the exciton reduced mass deduced from the experimental data. Our results illustrate that hBN represents an ideal platform to study the 2D optical properties as well as the relativistic properties of particles in a condensed matter system. (c) 2013 AIP Publishing LLC.
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页数：4
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