首页|Strain tunable excitonic optical properties in monolayer Ga2O3
Strain tunable excitonic optical properties in monolayer Ga2O3
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Two-dimensional(2D)Ga2O3 has been confirmed to be a stable structure with five atomic layer thickness configu-ration.In this work,we study the quasi-particle electronic band structures and then access the excitonic optical properties through solving the Bethe-Salpeter equation(BSE).The results reveal that the exciton dominates the optical absorption in the visible light region with the binding energy as large as～1.0 eV,which is highly stable at room temperature.Im-portantly,both the dominant absorption P1 and P2 peaks are optically bright without dark exciton between them,and thus is favorable for luminescence process.The calculated radiative lifetime of the lowest-energy exciton is 2.0x 10-11 s at 0 K.Furthermore,the radiative lifetime under+4％tensile strain is one order of magnitude shorter than that of the strain-free case,while it is less insensitive under the compressive strain.Our findings set the stage for future theoretical and experimental investigation on monolayer Ga2O3.
excitonsradiative lifetimeGa2O3
崔浩磊、权真、王舒东
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School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,China
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