You do not need an export control license for the mere presence of a foreign graduate student in your laboratory. You do need a license if you plan to transfer controlled technology and technical data to the foreign national if the export of that technology and its technical data is restricted from export to the foreign national’s home country.
The EAR license requirements apply to the transfer of controlled technology for “development,” “production,” or “use” of certain equipment. See 15 CFR 772.
If the graduate student is receiving technology that has already been published, then that technology is not subject to the EAR and no license is required for the release of that technology. See 15 CFR 734.3(b)(3).