The Scanning Tunnelling Microscope (STM) holds significant importance in nanoscale research of metallic and semiconducting materials. Its invention in 1981 by Gerd Binnig and Heinrich Rohrer led to their deserving Nobel Prize in Physics. The STM operates on the principle of quantum mechanical tunnelling between a sharp metallic tip and a sample (metallic or semiconducting), typically placed within a few angstroms' proximity. By applying a bias voltage between the tip and the sample, electrons are able to tunnel through the narrow gap between them. The resulting tunnelling current is measured and by adjusting the tip-sample distance and position with a feedback electronics, an image of the surface topography can be obtained at the atomic scale resolution. Moreover, local density of states (LDOS) across the Fermi level of a sample can be measured by measuring the tunnelling current as a function of bias voltage at a particular location of the sample.
The STM at IIT Delhi’s Sonepat campus is of make Unisoku Co. Ltd., Japan. The system is equipped with a load-lock chamber, a preparation chamber and an exchange chamber – all under ultra high vacuum (P ~ 1X 10-10 Torr) condition allowing topography and tunnelling measurements at very clean environment. The STM head is connected to He-3 cryostat offering the possibility to carry out measurements at temperature < 400 mK. Also, a 3-dimensional vector magnetic field is attached with this system so that tunnelling spectroscopy measurements are possible to be performed under magnetic field.
Ultra high vacuum-milli Kelvin STM Model : USM1300, Unisoku Co. Ltd., Japan
1. Registration process (One Time): New Registration for external users.User Verification: Upload photo of Front side and back side of valid Identity card issued by the organization (only .jpeg format, file Size less than 1 Mb, height less than 1000 pixels, width less than 800 pixels). Undertaking: Download the undertaking template ( Download Link ). Duly filled, signed and stamped form should be uploaded in .pdf format. Confirmation: An email will be sent to the user after verification of the documents.
2.Before planning to avail the Instrument facility of CRF IIT Delhi: user must visit https://crf.iitd.ac.in -> Facility -> select the desired facility from left side navigation list. Read carefully all the relevant information such as required sample type, testing charges and instrument location. Be prepared with details of the samples.
3.Log in and Click on Booking Appointment Tab: All the information relevant to testing must be filled in instrument booking form. In case user does not provide the required information the booking is liable to be rejected. User can upload the relevant existing data of their samples that might help in the measurements.
4.Sample submission & Payment Process: Once the application is submitted, the in-charge will verify the details and approve the request.External users must wait for the approval before making the payment and submitting the samples to concerned lab. After approval the payment should be made by the user. The payment transaction details need to be submitted online before appointment date time.
5.CRF Users can pay amount online using following details:
Beneficiary/Customer's Name: IRD ACCOUNT IITD
Bank Account Number: 10773572600
Bank Name: State Bank of India Branch Name: IIT Branch
Branch Code: 01077
NEFT IFSC CODE / RTGS: SBIN0001077
please write "CRF _Instrument Name" in the Remarks section while paying. Save the receipt file and upload in the crfbooking system online against your application.Payment can also made in form of demand draft in favour of " IRD ACCOUNT IITD " Payable at New Delhi.6.IIT Delhi
GST Number : 07AAATI0393L1ZI
PAN Number : AAATI0393L
1 Registration process (One Time): New Registration for internal users.
Fill in all the details in Personal Information, Supervisor Information and User Login Credentionals.
Once submitted, an email to supervisor is sent for activation of account. Once activated by supervisor, you can do the instrument bookings.
2 Before planning to avail the Instrument facility of CRF IIT Delhi: user must visit https://crf.iitd.ac.in > Facilities > select the desired facility from left side navigation list. Read ca refully all the relevant information such as required sample type, testing charges and instrument location. Be prepared with details of the samples.
3. Log in on CRF Booking System and Click on Booking Appointment Tab: All the information relevant to testing must be filled in instrument booking form. In case user does not provide the required information the booking is liable to be rejected. User can upload the relevant existing data of their samples that might help in the measurements.
4 Sample submission & Payment Process: Once the application is submitted, the in-charge will verify the details and approve the request.