Computational Condensed Matter Lab for
"Sustainable QuanTum Electronic Materials " (STEM)
Our Journey on "Topological Transport in Quantum Materials "
Quantum materials play crucial role in developing next-generation quantum technologies and meet the urgent technological demands for achieving a sustainable society. Berry phase in quantum materials leads to anomalous velocity which is responsible for dissipationless electronic transport using topological currents and quantum spins. Therefore, the engineering of the Berry phase is key for designing emergent functions of quantum materials. Our aim to study various topological tarnsport such as Anomalous Hall effect, Anomalous Nearest effect, Planat topological Hall effect, Topological Hall effect, Magnon Hall effect in different quantum materials via engineered Berry curvature.
STEM combines creativity with quantum science. Our lab delves into cutting-edge research on quantum materials focusing on innovation to bridge the gap between theory and experiment.
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Selected Publications :
[1] ‘ ‘Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers”, Nezhat Pournaghavi, Banasree Sadhukhan, Anna Delin, Scientific Reports 15(1)2255 (2025); DOI : https://doi.org/10.1038/s41598-024-80694-7 (I.F 4.379)
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[2] ‘ ‘ Topological magnon in exchange frustration driven incommensurate spin spiral of kagome lattice YMn6Sn6”, Banasree Sadhukhan, Anders Bergman, Patrik Thunstr¨om, Manuel Pereiro Lopez, Olle Eriksson and Anna Delin, Phys. Rev. B 110(17), 174412 (2024), DOI : https://doi.org/10.1103/PhysRevB.110.174412 (I.F 4.036)
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[3] ‘ ‘Effect of chirality imbalance on Hall transport of PrRhC2”, Banasree Sadhukhan, Tanay Nag, Phys. Rev. B Letter 107, L081110 (2023), DOI : https://doi.org/10.1103/PhysRevB.107.L081110
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​​[4] ‘ ‘Pressure-driven tunable properties of the small-gap chalcopyrite topological quantum ma- terial ZnGeSb2 : A first-principles study ”, Surasree Sadhukhan, Banasree Sadhukhan, Sudipta Kanungo, Phys. Rev. B 106, 125112 (2022) DOI : https://doi.org/10.1103/PhysRevB.106.125112
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[5] “Tunable chirality of noncentrosymmetric magnetic weyl semimetals in rare-earth carbides”, Rajyavardhan Ray, Banasree Sadhukhan, Manuel Richter, Jorge I. Facio, Jeroen van den Brink, npj Quantum Materials 7, 19 (2022) DOI : https://doi.org/10.1038/s41535-022-00423-z
Our Journey on "Skyrmion dynamics for modern spintronics"
Due to exponential growth in data storage, there is always a growin demand for increasing storage capacity. The racetrack memory with domain wall motion in ferromagnetic nanowires has potential to hold 100 times more data than any commercially available system at the same level of cost. Moving to one step ahead, it is now possible to grow crystalline heterostructures with atomic precision to produce magnetic quasiparticles called skyrmions for the advancement of racetrack memory where the size of the system scales down to the nanometer range. The magnetic spins either align up or down in typical ferromagnets, but they twist and swirl in skyrmions which advances high-density data storage in modern spintronics. The topological stability of skyrmion structures means that they persist over a very long time and are resistant to external perturbations such as thermal noise. An array of skyrmions can encode bits, with a presence indicating 1 and an absence indicating 0. The size of the skyrmion is∼ (10-20) nanometer which is 10,000 times thinner than a human hair. Therefore, the future of high density data storage, Logic gate lies in skyrmion based devices very well.
With a commitment to excellence, STEM aims to unearth the beauty of skyrmion dynamics through innovative research. Our lab investigate how to design and manipulate skyrmion in different magnetic quantum materials for the next generation spintronics devices.
Selected Publications :
[1] “Spin-lattice couplings and effect of displacements on magnetic interactions of a skyrmion system PdFe/Ir(111)”, Banasree Sadhukhan; Anders Bergman; Johan Hellsvik; Patrik Thunström; Anna Delin, SciPost Physics 18, 064 (2025); DOI : https://doi.org/10.21468/scipostphys.18.2.064 (I.F 5.29)
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​[2] ‘ ‘Engineering skyrmion from spin spiral in transition metal multilayers”, Banasree Sadhukhan, Journal of Physics: Condensed Matter 37 095801 (2024), DOI : 10.1088/1361-648X/ad9da8; Published as a special issue “Focus on Magnetic Topological Materials with Reduced Dimensionality” in Journal : https://iopscience.iop.org/collections/jpcm-240514-555 (I.F 2.3)
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​[3] “Interplay between interfacial Dzyaloshinskii-moriya interaction and magnetic anisotropy in 4d transition metal multilayers for skyrmion nucleation”, Tamali Mukherjee, Banasree Sadhukhan*, and V Satya Narayana Murthy* (*joint last author), Journal of Magnetism and Magnetic Materials 625 173036 (2025) DOI: https://doi.org/10.1016/j.jmmm.2025.173036 (I.F 2.5)
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[4] “Spin-lattice couplings in two-dimensional CrI3 from first-principles computations”, Banasree Sadhukhan, Anders Bergman, Yaroslav O. Kvashnin, Johan Hellsvik, and Anna Delin, Phys. Rev. B 105, 104418 (2022) DOI : https://doi.org/10.1103/PhysRevB.105.104418
Our Journey on "Renewable energy-harvesting quantum technologies"
The bulk photovoltaic effects refer to the generation of a photocurrent and above-bandgap photovoltage in materials having no inversion symmetry. It is a second-order optical process that converts the light into DC currents. Shift current is one of the bulk photovoltaic effects under linearly polarized light resulting from the Berry phase of the constituting electronic bands and differs significantly from the typical p-n junction-based photovoltaic mechanism for solar energymconversion. Photoexcited carriers shift in real space due to the difference in the Berry connection between valence and conduction bands during optical excitation. In the shift current mechanism,mthe driving force for carrier separation is not the built-in electric field, but the coherent evolution of electron and hole wave functions which is based on the framework of Green’s functions and nonlinear optics. The behaviour of carriers is governed by coherent excitation instead of inelastic scattering immediately after excitation by light.
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A variety of ambient energy sources, such as heat, light, electromagnetic waves, could be used to harvest energy. Bulk photovoltaics effect is a modern and alternative way of solar energy conversion under application of electromagnetic waves. STEM is working on energy harvesting technologies to study the bulk photovoltaic effects in quantum materials.
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Selected Publications :
[1] ‘ ‘Large bulk photovoltaic effect and Fermi-surface-mediated enhancement with chemical potential in ZnGeP2”, Banasree Sadhukhan, Journal of Physics: Condensed Matter 37 165701 (2025), DOI : 10.1088/1361-648X/adbb48, Published as a special issue “Women in Computational Condensed Matter Physics” in Journal : https://iopscience.iop.org/collections/jpcm-240514-555
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​[2] “Electronic structure and unconventional nonlinear response in double Weyl semimetal SrSi2”, Banasree Sadhukhan, Tanay Nag, Phys. Rev. B 104 (24), 245122 (2021) DOI : https://doi.org/10.1103/PhysRevB.104.245122
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​[3] “Role of time reversal symmetry and tilting in circular photogalvanic responses”, Banasree Sadhukhan, Tanay Nag, Phys. Rev. B 103, 144308 (2021)
DOI : https://doi.org/10.1103/PhysRevB.103.144308
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[4] “Bulk photovoltaic effect in BaTiO3-based ferroelectric oxides: An experimental and theoretical study”, Subhajit Pal, S Muthukrishnan, Banasree Sadhukhan, Sarath NV, D Murali, Pattukkannu Murugavel, J. Appl. Phys 129, 084106 (2021)
DOI : https://doi.org/10.1063/5.0036488
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[5] “First-principles calculation of shift current in chalcopyrite semiconductor ZnSnP2”, Banasree Sadhukhan, Yang Zhang, Rajyavardhan Ray, Jeroen van den Brink, Phys. Rev. Materials 4, 064602 (2020) DOI : https://doi.org/10.1103/PhysRevMaterials.4.064602
Project 1
Title : "Emerging magneto-transport and thermoelectric responses in altermagnets for novel application of energy harvesting", funded by ANRF, India Government (file no : ANRF/ECRG/2024/005021/PMS)
Project 2
Title : "Interplay between skyrmion and band topology for sustainable transport", funded by DST, India Government (file no. DST/WISE-PDF/PM-4/2023)
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Ongoing Scientific Projects
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