Spectroscopy of Quantum Materials
(Experimental Condensed Matter Physics)
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Exploring Novel Materials and Emergent Quantum Phenomena
Quantum Phenomena in Low-Dimensional Materials - emergent quantum behavior and collective excitations in reduced dimensions, where enhanced correlations and confinement lead to novel electronic phases.
Topological Phases and Long-Range Order in Strongly Correlated Materials.
--- How do topology and symmetry breaking coexist or compete?
Systems like magnetic topological insulators, altermagnets, and topological superconductors challenge the Landau paradigm.
--- What governs topological phase transitions?
Unlike conventional symmetry-breaking transitions, their critical behavior and universality classes are still unclear. Time-domain and fluctuation spectroscopies provide unique experimental windows into these nonequilibrium critical dynamics.
Charge Density Wave Physics and Phase Transitions -- emergence dynamics, and fluctuation-driven melting of collective ordered states in quantum materials.
Critical Phenomena in Strongly Correlated Materials -- Addressing the fundamental question: what governs topological phase transitions?
Utilization of Quantum Functionalities for Next-Generation Devices.
Summary:
Our research is primarily centered around investigating the intriguing quantum phenomena exhibited by low-dimensional quantum materials with a layered structures. Specifically, we are interested in studying emerging phenomena arising from the interplay of electronic state topology and collective order in vdW quantum materials. The families of (a) Quasi-2D vdW ferromagnets and topological materials, and (b) Quasi-1D vdW materials serve as an exceptional and versatile platform for probing critical quantum phenomena such as the dynamic response of charge density waves (CDW) and topological phases in 1D chains. To facilitate our research activities, we have established a range of in-house experimental facilities, including low-frequency 1/f fluctuation spectroscopy, and thermal transport measurement systems. Low frequency 1/f noise play a detrimental role in functionality and reliability of quantum devices and sensors. Precise characterization and optimization of device performance through detailed measurements of 1/f noise is paramount for any practical applications.
May 2025: Congratulations to Mr. Sk Kalimuddin for the manuscript titled “Barrier height inhomogeneity and origin of 1/f-noise in topological insulator-based photo-detector ” accepted in ACS Appl. Mater. Interfaces (2025)
Dec 2024: Congratulations to Mr. Arnab Bera for the manuscript titled “Raman Signature of inversion symmetry breaking structural transition in quasi-1D compound, (TaSe4)3I” accepted in Journal of Physics: Condensed Matter.
Nov 2024: Congratulations to Dr. Satyabrata Bera for the manuscript titled “Nonlinear Optical Properties of 2D vdW Ferromagnetic Nanoflakes for Magneto-Optical Logic Applications.” accepted in Advanced Optical Material.
May 2024: Congratulations to Mr. Sk Kalimuddin for the manuscript titled “Exceptionally slow, long-range, and non-Gaussian critical fluctuations dominate the charge density wave transition” accepted in Physical Review Letters.
August 2023: Congratulations to Mr. Satyabrata Bera for the manuscript titled “Anomalous Hall effect induced by Berry curvature in topological nodal-line van der Waals ferromagnet Fe4GeTe2” accepted in Physical Review B.
July 2023: Congratulations to Mr. Satyabrata Bera for the manuscript titled “Enhanced coercivity and emergence of spin cluster glass state in 2D ferromagnetic material Fe3GeTe2” accepted in Journal of Magnetism and Magnetic Materials.
July 2023: Congratulations to Arnab Bera for the manuscript titled “Centrosymmetric-noncentrosymmetric Structural Phase Transition in Quasi one-dimensional compound, (TaSe4)3I” published in Physical Review B.
July 2023: Congratulations to Prof. Goutam Sheet & his group and Mr. Satyabrata Bera for the manuscript titled “High transport spin polarization in the van der Waals ferromagnet, Fe4GeTe2” published in Physical Review B.
February 2023: Congratulations to Arnab Bera for the manuscript titled "Emergence of electric field-induced conducting states in single-crystalline MoTe2 nanoflakes and its application in memristive devices", published in Applied Surface Science.
January 2023: Congratulations to Satyabrata, Prof. Malik, and his group members for the manuscript titled “Charge Transport and Low-frequency conductance Noise in Metal-nanoparticle Embedded One-dimensional Conducting Polymer Nanotubes: Multiple Resistive Switching Phenomena” published in Materials Today Nano.
January 2023: Congratulations to Satyabrata Bera for the manuscript titled "Unravelling the nature of spin reorientation transition in quasi-2D vdW magnetic material, Fe4GeTe2", published in the Journal of Magnetism and Magnetic Materials.
June 2022: Congratulations to Sk Kalimuddin and Dr. Biswajit Das for the manuscript titled "Nonlinear coherent light-matter interaction in 2D MoSe2 nanoflakes for all-optical switching and logic applications", published in Advanced Optical Materials.
Recent works from our group!
Recent works from our group!
Sk Kalimuddin et. al., Low-Frequency 1/f Noise and Barrier Height Inhomogeneity in Topological Insulator-Based Photodetectors, ACS Appl. Mater. Interfaces (2025)
Arnab Bera et. al., Raman Signature of inversion symmetry breaking structural transition in quasi-1D compound, (TaSe4)3I, JPCM 7 (12), 125403 (2025)
Satyabrata Bera et. al., Nonlinear Optical Properties of 2D vdW Ferromagnetic Nanoflakes for Magneto‐Optical Logic Applications . Adv. Optical Mater. 2402318 (2025)
Sk Kalimuddin et. al., Exceptionally Slow, Long-Range, and non-Gaussian Critical Fluctuations Dominate the Charge Density Wave Transition Phys. Rev. Lett. 132, 266504 (2024)
Arnab Bera et al, Inversion symmetry breaking structural transition in quasi-1D compound, (TaSe4)3I, Physical Review B 108 (3), 035112 (2023)
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