Our group El Nano

• What happens to magnetism if you thin your magnet down to few atomic layer?  "At any non-zero temperature, a one- or two-dimensional isotropic spin-S Heisenberg model with finite-range exchange interaction can be neither ferromagnetic nor antiferromagnetic."- Phys. Rev. Lett.  (1966) by N. D. Mermin and H. Wagner.  But what happens when we have "anisotropy" in the system -->Two-dimensional (2D) Magnetism - atomic layer magnetic materials (Ferro/antiferro)
• And what happens when you stack your "thin" magnet on another  "exotic"  order! - Heterostructure with magnet and topological insulator - magnetic topological insulator
• Can we control/manipulate elementary excitations (magnon/s) in magnets via electric/magnetic field?
• Probing quasi 1D edge states of layered 2D semiconductor/insulator - 1D/2D vdW heterostructure  
• Nanospintronics - Spin transport in quantum dots and 2D materials
• Hybrid 2D materials (Graphene, 2D TMDCs, etc.)

Experimental Technique:

• Sample growth - Chemical Vapor Transport, Solid State Reaction
• Fabrication of devices: Lithography (e-beam, optical), Thermal evaporation, Sputtering
• Characterization:

• Chemical Vapor Transport for sample growth [SERB] - vdW layered materials (single crystal) grown here
• Thermal Evaporator
• Wire bonder [Seed grant]
• Low-temperature cryostat (10 K - 300 K) [SERB]
• Probe station and accessories for electrical transport measurement [SERB]

Central Facility, IACS:

• Raman spectroscopy -  temperature dependent
• e-beam lithography
• SQUID, PPMS, Dielectric Measurement
• Atomic Force Microscopy
• Laser Scanning Confocal Microscope

Ms. Anudeepa Ghosh (SRF, Institute Fellow) - working on layered antiferromagnets  [e-mail: anudeepa.ghosh@gmail.com], BSc - CU, MSc - BHU. Selected Publication/s: Phys. Rev. B 103, 064431 (2021) Thesis submitted

Mr. Sujan Maity (SRF, INSPIRE) - working on magnetic vdW heterostructures [e-mail: sujanmaity1994@gmail.com], BSc - WBSU, MSc - IIT Guwahati. Recent work: arXiv:2212.12772

Mr. Bikash Das (Int. PhD) - working on layered ferromagnets and local electronic transport properties. [e-mail: bikashcgr1@gmail.com], BSc - Burdwan University, MSc - IACS.  Selected Publication/s: ACS Nano (2021) [https://doi.org/10.1021/acsnano.1c08212]

Mr. Rahul Paramanik (JRF) - working on large area growth of vdW materials. [e-mail: rahulparamanik456@gmail.com].  BSc - Burdwan University, MSc - ISM Dhanbad. 

Ms. Tanima Kundu (JRF, INSPIRE) -  working on magnetic semiconductors and related devices.  [e-mail: tanima.kundu96@gmail.com], BSc - Burdwan University, MSc - Burdwan University. Recent work: arXiv:2302.06491

Dr. Mainak Palit (RA1) - Raman Spectroscopy and device physics. [e-mail: mainakpalit@gmail.com], PhD - CRNN, CU. Selected Publication/s: https://doi.org/10.48550/arXiv.2303.01204 (pressure induced phase transition in vdW materials)

Mr. Pabitra Kumar Hazra (JRF) -  [e-mail: pabitrahazra96@gmail.com].  BSc - CU, MSc - CU. - working on Si-based microelectronics

Ms. Poulomi Maji (JRF) -  [e-mail: poulomimaji8@gmail.com].  BSc - CU, MSc - CU. - Working on instabilities in vdW metals

Mr. Soumik Das (JRF, SERB project) -  [e-mail: dassoumik555@gmail.com].  BSc - CU, MSc - CU. - physics @ high pressure

Dr. Koushik Dey (RA1) - Ferroelectricity, Piezoelectricity, Dielectric spectroscopy, Pyrocurrent. [e-mail: koushikdey664@gmail.com], PhD - UGC-DAE CSR Indore 

Funding:

1. Recent grant (2022 - ): SCP/2022/000411, Total cost: 35,03,520 INR, Title: Wearable Bioelectronic Circuit Arrays for the Detection of Glucose, Co-PI: Prof Sudip Malik (SAIS, IACS)

2. Recent grant (2022 - ): CRG/2021/004334, Total cost: 49,12,920 INR (SERB) + 24,75,000 INR (Inst equipment 50% share), Title: Two-dimensional Magnets under Extreme Conditions: Manipulation of Electronic and Magnetic Order

3. Institute Funding -  Seed grant, Annual grant, Individual grant

4. DST-SERB grant No. ECR/2017/002037 (total cost: 50,00,000 INR) completed
5. UGC-DAE CSR grant No. CRS-M-279
6. Support from the Technical Research Centre (TRC), IACS

Collaboration:

• Theory: Prof. Arghya Tarafdar (IIT, Kharagpur), Prof. Liping Yu (Univ. of Maine), Dr. Dibyendu Dey (Univ. of Maine), Dr. Kapildeb Dolui (Univ. of Delaware), Milena Grifoni (Universität Regensburg), Magdalena Birowska (University of Warsaw)
• Experiment: LNCMI (Grenoble), IUC (Indore), BARC

                      Prof, Achintya Singha (Bose Institute), Prof. Krishnakumar SR Menon (SINP), Dr. Atindra Nath Pal (SNBNCBS),                                        Prof. Sudip Malik (IACS),  Dr. Mintu Mondal (IACS)                                        

For discussion:

You can reach me via email: sspsdd@iacs.res.in

You will find me at Lab 116E, IACS, Main Building

Banner Cartoon: Process flow of  nanoelectronic devices fabricated in our lab using institute facilities.  The process has been optimized by Dr Mainak Palit and Mr. Sujan Maity. Special thanks to Dr. KDM Rao - in-charge of the EBL@IACS.

Homepage Figure: Laser Scanning Confocal Microscopy image of home grown FePS3 (vdW antiferromagnet) flakes on viscoelastic substrate.