Faculty Profile

About

Researcher with broad experience in experimental condensed matter physics, Semiconductor device physics, Nano-optics, material characterizations, and Lasers

Education

• PhD - Physics
  Bangalore University
  Passed Year: 2021 | Program Type: FullTime
• MSc - Physics
  Bangalore University
  Passed Year: 2008 | Program Type: FullTime
• BSc - PCM
  Bangalore University
  Passed Year: 2006 | Program Type: FullTime

Selected Publications

• Journal | Published On : 30-07-2026
  L.D. Varma Sangani, Chandan, Supriya Mandal, Kenji Watanabe, Takashi Taniguchi, Mandar M. Deshmukh
  Charge-Induced Dynamics in Hexagonal Boron Nitride Nanoelectromechanical Resonators. We demonstrate electrostatic actuation of insulating nanodrums made of hexagonal boron nitride (hBN), a van der Waals large bandgap dielectric. Without the explicit conductive layer, we utilize a nonuniform electric field for the electrostatic actuation. The fundamental resonance mode, observed near 26 MHz, exhibits an unconventional linear resonance frequency dispersion with applied DC bias voltage. A bias-dependent frequency drift of the nanodrums over an extended period of time suggests slow charge dynamics in the hBN drum. Band-bending analysis and wavelength-dependent optical excitation reveal deep defect states in hBN that experience bias and photoassisted ionization, resulting in asymmetric charge buildup for opposing bias polarities. Our experimental findings and theoretical analysis demonstrate that electrostatically driven hBN drums serve as a sensitive platform for investigating charge dynamics and defect physics in insulating two-dimensional materials, thereby paving the way for novel nanoelectromechanical systems-based sensors and charge-controlled mechanical devices.
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• Journal | Published On : 28-08-2025
  Raman Kumar, Chandan, Gabriel I. López Morales, Richard Monge, Anton Vakulenko, Svetlana Kiriushechkina, Alexander B. Khanikaev, Johannes Flick & Carlos A. Meriles
  As the ability to integrate single-photon emitters into photonic architectures improves, so does the need to characterize and understand their interaction. Here we use a scanning diamond nanocrystal to investigate the interplay between the emission of room-temperature nitrogen–vacancy (NV) centres and a proximal topological waveguide. In our experiments, NVs serve as local, spectrally broad light sources, which we exploit to characterize the waveguide bandwidth as well as the correspondence between the light injection site and the directionality of wave propagation. We find that near-field coupling to the waveguide influences the spectral shape and ellipticity of the NV photoluminescence, revealing nanostructured light fields through polarization and amplitude contrasts exceeding 50%, with a spatial resolution set by the nanoparticle size. Our results expand on the sensing modalities afforded by colour centres, highlighting novel opportunities for on-chip quantum optics devices that leverage topological photonics to optimally manipulate and read out single-photon emitters.
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• Journal | Published On : 16-12-2022
  Pratap Chandra Adak, Subhajit Sinha, Debasmita Giri, Dibya Kanti Mukherjee, Chandan, LD Varma Sangani, Surat Layek, Ayshi Mukherjee, Kenji Watanabe, Takashi Taniguchi, HA Fertig, Arijit Kundu, Mandar M Deshmukh
  Perpendicular electric field drives Chern transitions and layer polarization changes in Hofstadter bands
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• Journal | Published On : 28-05-2022
  Sharmistha Naskar, Chandan, Divya Baskaran, Aditya N Roy Choudhury, Subhomoy Chatterjee, Subbaraj Karunakaran, BV Sreenivasa Murthy, Bikramjit Basu
  Dosimetry of pulsed magnetic field towards attaining bacteriostatic effect on Enterococcus faecalis: Implications for endodontic therapy
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• Journal | Published On : 29-04-2021
  Chandan, Suman Sarkar, and Basavaraj Angadi1
  Defects induced persistent photoconductivity in monolayer MoS2.
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• Journal | Published On : 28-07-2020
  Chandan, Saurav Islam, V Venkataraman, Arindam Ghosh, Basavaraj Angadi
  Observation of linear magneto-resistance with small cross over field at room temperature in Bismuth
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