Indian Association for the Cultivation of Science

Name : Subhadeep Datta

Deptartment : School of Physical Sciences
Designation : Assistant Professor
Contact : +91 33 2473 4971 (Ext:2141)
Email : sspsdd@iacs.res.in


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Principal Investigator:                                                                                         
Dr. Subhadeep Datta                                                                           
Assistant Professor (2019 -)
School of Physical Sciences
email id: sspsdd@iacs.res.in
Phone:+91-33-2473 4971 (ext 2141)
LAB: 116E, Main building, IACS
Office: Room No. C209, Centenary Building , IACS           
 
 

Our group El Nano

Research Interest: Experimental Condensed Matter Physics
Thrust Areas of Research:  Two-dimensional (2D) Magnetism, Mesoscopic Physics,
                                               Development of micro/nano-electronic sensors and arrays
 
What are the broad research questions/issues that interest us? 
        
  • 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:
Bulk magnetization - SQUID/VSM,
Electronic/magnetotransport - Low temperature electron transport (Cryostat)
Phonons - Raman Spectroscopy (low-temperature), FT-IR
Local transport - Conductive Atomic Force Microscopy (CAFM)
 
Research Facility:
Group facility:
  • 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
 
Research Group:

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)

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

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. 

Dr. Mainak Palit (RA1) - Raman Spectroscopy and device physics. [e-mail: mainakpalit@gmail.com], PhD - CRNN, CU. Selected Publication/s: Phys. Rev. B 104, 134437 (2021)

Dr. Bipul Kumar Mahato (RA1) - Magnon dynamics in ferro/antiferromagnets. [e-mail: bipul.kumar.mahato@gmail.com], PhD - SNBNCBS

Dr. Subrata Ghosh (RA1) - Magnetocaloric Effect -  [e-mail: subrataghosh728@gmail.com], PhD - SNBNCBS

Recently joined:

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

 

Funding:

  1. 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

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

  3. DST-SERB grant No. ECR/2017/002037
  4. UGC-DAE CSR grant No. CRS-M-279
  5. 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

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


Academic Profile

Academic Profile:
Assistant Professor 2019 - School of Physical Sciences, IACS, Kolkata.
Faculty Fellow 2017 - 2019, School of Physical Sciences, IACS, Kolkata.
Postdoc: 2014 - 2017, Centre for Advanced 2D Materials, National University of Singapore, Singapore.
Postdoc: 2011 - 2013, Laboratoire Pierre Aigrain, École Normale Supérieure (ENS), Paris, France.
PhD: 2007-2011, Nanophysique, Institut Néel, CNRS, Grenoble, France
                            Title: "Electrical transport properties of carbon nanotubes filled with magnetic nanoparticles"
                            Supervisor: Prof. Dr. Wolfgang Wernsdorfer
M.Sc.: 2004-2006, Physics, IIT Kanpur, India.
B.Sc.: 2001-2004, Physics, RKM Vidyamandira, Belur Math, University of Calcutta.


Publication

Publications

 
 
Current paper:
  • Our recent work on semiconducting layered 1D FET - arXiv:2209.03296v2 
  • Anisotropic Magnetodielectric Coupling in Layered Antiferromagnetic FePS3 - 
  • Thermal analog of electronic bipolar junction transistor (BJT) - Theoretical work in collaboration with Arnab (IITK) and Victor ( 

    IISER Berhampur) - link - 

     arXiv preprint arXiv:2204.06178
  • Our current work on probing edge states of vdW heterostructure.
 
 
 
 
 
  • Magnon-phonon coupling with magneto-Raman spectroscopy
                        - hybridization of the modes (M- and P3) can be observed from the anticrossing [This work has been carried out in collaboration with LNCMI, EMFL]
 
 
Please see the link for the full paper: 
 

 


Teaching

  • Electronics (Theory) - BS-MS [Course name: Electrodynamic Theory & Electronics, Credit: 4, Course Type: Core-theory]
  • Electronics (Theory and Practical, PH407, Credit: 2+6) - Master's/Integrated Master's-Ph.D 

We have a special course on sensors with microcontrollers included in the Electronics practical. Online classes (hands-on practical experience sitting at home) are conducted to manage the curriculum during the pandemic

TA (Microcontroller) - Mr. Arnab Bera (SRF), Ms. Anudeepa Ghosh (SRF)

  • BS/MS project for SPS students for VII semester: "Lab rotation" Topic: Detection of Phonons in an Atomic Layer

TA (vibrational spectroscopy): Dr. Mainak Palit (RA-1)

Out of Syllabus:

  • Lockdown Special -  Playing with Sensors and Data Acquisition 
  • Chua circuit: Introduction to Chaos - Demonstration [Theory: Prof. J. K. Bhattacharjee]
  • Low-power Multimeter 
  • Solving Differential Equation in Breadboard
  • Can you assess "Soil Health"?     
  • Modelling Spatiotemporal Variation of Precipitation 


Facilities

Group facility:
  • Chemical Vapor Transport for sample growth [SERB],
  • Chemical Vapor Deposition [Institute grant]
  • Assembled vacuum sealing of quartz tube used for growth
  • Annealing furnace [institute grant]
  • Thermal Evaporator [inherited]
  • Lithography [home assembled] and wet bench for post lithography processing [institute grant]
  • Wire bonder [Seed grant]
  • Low-temperature cryostat (10 K - 300 K) [SERB]
  • Probe station and accessories for electrical transport measurement [SERB]

You are welcome to use any in-house facilities. Drop an email with an expression of interest at

sspsdd@iacs.res.in


Open Positions

Open Position:
 
PhD:
Candidates (with CSIR-UGC JRF) motivated to work on interesting problems of two-dimensional (2D) magnetic van der Waals (vdW) heterostructures may contact [email your resume and expression of interest at sspsdd@iacs.res.in]. You can expect to learn the intricacies of sample growth with a target physics in mind, understanding the electronic structures, spin texture, experimenting with microscopy, measuring electron transport properties - device physics, and exploring the nuances of phonons.
Most importantly - challenging yourself in projects with the limited resources! Somehow, we will try to find a way no matter how many potholes. 
You may also talk to senior PhD students of our group about the current research work and overall objective of the laboratory. 
 
*Please keep in mind that you'll have to appear as a candidate in the interview/exam following the rules of the institute.*
 
RA1 (postdoctoral research)
Fellowship depends on the availability of the institute grant.
 
 
Project
Enthusiastic students may apply for MSc project.
Special interest: Electronics and Instrumentation 
 

 


Project Students Alumni

Mr. Chayan Patra (MS project), currently JRF@IITB

Dr. Avishek Das (project student) -  currently Post-Doc@Federal University of Pernambuco, Brazil

Ms. Tamasri Senapati (Intern) - Phd student@Research Freie Universitat Berlin

Mr. Hemanto Karmakar (project student, affiliation: MSC Electronics Science, JU)- hemantokarmakar128@gmail.com

Dr. Bipul Kumar Mahato (RA1) - Magnon dynamics in ferro/antiferromagnets. [e-mail: bipul.kumar.mahato@gmail.com], PhD - SNBNCBS

Dr. Subrata Ghosh (RA1) - Magnetocaloric Effect -  [e-mail: subrataghosh728@gmail.com], PhD - SNBNCBS


Contact Us

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

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


Group News

  • Our proposal on "Soil Health Monitoring Device and Remote Data Logger" has been selected for Technology Incubation under MeitY TIDE 2.0 EiR @ IIM Calcutta.  Congratulations to Mainak. We are also thankful to past students (mainly, Avishek and Saikat) who have contributed to the construction of the circuit and modification. We are looking for enthusiastic project students who may work with us for the final prototype. [Link: http://iimcip.org/meity-tide2/#]
  • Mainak and Sujan have "finally" finalized a recipe for the fabrication of circuits (400 - 500 nm) with nanostructure in EBL. Thanks to Dr. KDM Rao and his group for the continuous support. We also thank the operator (Mr. Manish) of the EBL. 
  • CVT set up for the crystal growth working regularly. We are looking for collaboration for the growth of novel vdW materials. [responsible students: Bikash Das, Sujan Maity]
  • Optical upright microscope (under CSS facility) has been installed recently.


Research Activities

We have started painting and writing on our 2D samples: 

While senior students are working on nanolithography, 

newbies are creating lines on a specific area to join a few unknown dots!

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Group 1

Research Group:
  • 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)
  • Mr. Sujan Maity (SRF, INSPIRE) - working on magnetic vdW heterostructures [e-mail: sujanmaity1994@gmail.com], BSc - WBSU, MSc - IIT Guwahati.
  • 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. 
  • Dr. Mainak Palit (RA1) - Raman Spectroscopy and device physics. [e-mail: mainakpalit@gmail.com], PhD - CRNN, CU. Selected Publication/s: Phys. Rev. B 104, 134437 (2021)
  • 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

 

Project student: (2022 - )

  • Bipul Karmakar -  [PG-2021 BATCH - Master's/Integrated Master's-Ph.D] - semiconductor physics
  • Barnik Pal - [UG- BATCH 2019 - BS-MS] - ultrasound propagation