The incident sparked immediate protests by the PhD students of the premier institute who are demanding suspension and strict action against the accused supervisor.
The fifth year student had attempted suicide on Sunday at his residence in Gautam Nagar by overdosing on drugs.
The victim, according to an acquaintance, is right now admitted at the hospital's psychiatry ward for counselling.
However, according to the police, they are yet to receive any formal complaint into the incident.
"Dr Rajat Prakash was admitted to AIIMS after consuming sleeping pills. Preliminary enquiry conducted revealed that the patient is a student of PHD and was feeling harassed by his guide. He had taken sleeping pills. He is stable but still in AIIMS. No formal complaint received so far," Romil Baaniya, Deputy Commissioner of Police (South) said.
"I have been under constant mental harassment and humiliation. She has again and again used filthy and abusive language in front of everyone. She scolds even when work is done correctly. My mental harassment is aggravated as she is not able to procure appropriate facilities, funds in the lab and makes no attempt to get the things done. Due to not holding of DCs in time, my fellowship is delayed and this puts me in additional financial problem and mental burden," the student alleged in the letter.
He also claimed that some students, who also are undergoing PhD under the same guide, have contracted TB while working in the lab due to lack of proper equipment and personal protective accessories given to them.
"We are looking into the matter and the allegations made by the student...an inquiry into the incident will be conducted accordingly", a senior AIIMS official said.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.