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Questions tagged [exciton]

Questions about excitions.

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4 votes
0 answers
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Calculating excitonic optical properties with BSE level in VASP

I have been working on 2D material systems and their heterostructures. While calculating BSE excitonic optical properties in VASP, I encountered that the 2D material property is well matched with ...
3 votes
0 answers
158 views

How is exciton binding energy calculated?

I am having some difficulties understanding values of exciton binding energies for $\ce{MoS2}$ monolayer. In various papers: Interlayer and intralayer excitons in MoS2/WS2 and MoSe2/WSe2 ...
16 votes
2 answers
2k views

How to understand the spin of exciton?

In very recent years, exciton physics has been intensively explored as the emergence of 2D materials. Exciton is a bound electron-hole pair and is bosonic, namely hosting an integer spin. My first ...
8 votes
1 answer
1k views

How can I find the binding energy for exciton (optical gap) with VASP?

What is the best way to find the binding energy for exciton using VASP? I have heard about the method of calculating it through the dielectric tensor with local ...
8 votes
3 answers
907 views

Why can't we change the spin angular momentum of electrons with an external optical field?

I have read this paper many times: Coupled Spin and Valley Physics in Monolayers of MoS2 and Other Group-VI Dichalcogenides. Interestingly, this paper is also discussed many times in this community, ...
8 votes
1 answer
172 views

How to evaluate the exciton velocity?

I have calculated the exciton wave functions using the GW-BSE method: $$\tag{1}|S\rangle = \sum_{cv\mathbf{k}} A_{cv\mathbf{k}} |cv\mathbf{k}\rangle$$ where $c$ for conduction and $v$ for valence ...