Clone of Dr Siddharth Dhomkar

	Postdoctoral Research Associate tel: +44 (0)20 7679 2367; ext: 32367 email: jjl.morton@UCL office: 2C5

Postdoctoral Research Associate

tel: +44 (0)20 7679 2367; ext: 32367
email: jjl.morton@UCL
office: 2C5

Research Interests

I am interested in studying atom-like defect centers and associated spins in wide band-gap materials for applications ranging from quantum information science to nano-scale metrology.

In the past, I have investigated Aharanov-Bohm effect and magneto-optic Kerr effect related to epitaxially grown quantum dots & isoelectronic centers and have also explored possibility of using these structures for fabricating solar cells and lasers.

More recently, I studied charge and spin dynamics associated with various defect centers in diamond for a variety of applications including long-term memory storage, spintronics, nanoscale sensing, and nuclear hyperpolarization.

At UCL, I am working on a combined atomic force microscope and confocal fluorescence microscope that can work at cryogenic temperatures as low as 1.8 K. This tool is designed to characterize and coherently control spins in a range of materials, down to the single spin level.

Interesting fact

I am an ardent food lover and an aspiring multi-cuisine chef. Want to own a restaurant one day called "Pune to London via New York!"

IRIS department Widget PlaceholderSDHOM94

Publications

H. Jayakumar, S. Dhomkar, J. Henshaw, and C. A. Meriles, Spin readout via spin-to-charge conversion in bulk diamond nitrogen-vacancy ensembles, Applied Physics Letters 113, 122404 (2018).
S. Dhomkar, H. Jayakumar, P. R. Zangara, C. A. Meriles, Charge dynamics in near-surface, variable-density ensembles of nitrogen vacancy centers in diamond, Nano Letters 18, 4046 (2018).
A. Ajoy, K. Liu, R. Nazaryan, X. Lv, P.R. Zangara, B. Safvati, G. Wang, D. Arnold, G. Li, A. Lin, P. Raghavan, E. Druga, S. Dhomkar, D. Pagliero, J. A. Reimer, D. Suter, C. A. Meriles, A. Pines, Orientation independent room-temperature optical ¹³C hyperpolarization in powdered diamond, Science Advances 4, eaar5492 (2018).
S. Dhomkar, P. R. Zangara, J. Henshaw, C. A. Meriles, On-Demand Generation of Neutral and Negatively-Charged Silicon-Vacancy Centers in Diamond, Physical Review Letters 120, 117401 (2018).
D. Pagliero, K. R. K. Rao, P. R. Zangara, S. Dhomkar, H. H. Wong, A. Abril, N. Aslam, A. Parker, J. King, C. E. Avalos, A. Ajoy, J. Wrachtrup, A. Pines, C. A. Meriles, Multispin-assisted optical pumping of bulk ¹³C nuclear spin polarization in diamond, Physical Review B 97, 024422 (2018).
I. L. Kuskovsky, L. G. Murokh, B. Roy, H. Ji, S. Dhomkar, J. Ludwig, D. Smirnov, M. C. Tamargo, Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons, Physical Review B 95, 165445 (2017).
V. Deligiannakis, S. Dhomkar, H. Ji, D. Pagliero, I. L. Kuskovsky, C. A. Meriles, M. C. Tamargo, Spin dynamics of ZnSe-ZnTe nanostructures grown by migration enhanced molecular beam epitaxy, Journal of Applied Physics 121, 115702 (2017).
S. Dhomkar, J. Henshaw, H. Jayakumar, C. A. Meriles, Long-term data storage in diamond, Science Advances 2, e1600911 (2016).
H. Jayakumar, J. Henshaw, S. Dhomkar, D. Pagliero, A. Laraoui, N. B. Manson, R. Albu, M. W. Doherty, C. A. Meriles, Optical patterning of trapped charge in nitrogen-doped diamond, Nature Communications 7, 12660 (2016).
H. Ji, S. Dhomkar, R. Wu, V. Shuvayev, V. Deligiannakis, M. C. Tamargo, J. Ludwig, Z. Lu, D. Smirnov, A. Wang, I. L. Kuskovsky, Optical Anisotropy in Type-II ZnTe/ZnSe Submonolayer Quantum Dots, Journal of Applied Physics 119, 224306 (2016).
S. Dhomkar, N. Vaxelaire, H. Ji, V. Shuvayev, M. C. Tamargo, I. L. Kuskovsky, I. C. Noyan, Determination of shape anisotropy in embedded low contrast submonolayer quantum dot structures, Applied Physics Letters 107, 251905 (2015).
S. Dhomkar, H. Ji, B. Roy, V. Deligiannakis, A. Wang, M. C. Tamargo, I. L. Kuskovsky, Measurement and control of size and density of type-II ZnTe/ZnSe submonolayer quantum dots, Journal of Crystal Growth 422, 8 (2015).
H. Ji, S. Dhomkar, B. Roy, V. Shuvayev, V. Deligiannakis, M. C. Tamargo, J. Ludwig, D. Smirnov, A. Wang, I. L. Kuskovsky, Determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer quantum dots via spectral analysis of optical signature of the Aharanov-Bohm excitons, Journal of Applied Physics 116, 164308 (2014).
B. Roy, H. Ji, S. Dhomkar, M. C. Tamargo, I. L. Kuskovsky, Observation of oscillations in energy of Aharonov-Bohm excitons in type-II ZnTe/ZnSe stacked submonolayer quantum dots. Physica Status Solidi C 7-8, 1248 (2014).
S. Dhomkar, U. Manna, I. C. Noyan, M. C. Tamargo, I. L. Kuskovsky, Vertical correlation and miniband formation in submonolayer Zn(Cd)Te/ZnCdSe type-II quantum dots for intermediate band solar cell application, Applied Physics Letters 103, 181905 (2013).
S. Dhomkar, U. Manna, L. Peng, R. Moug, I. C. Noyan, M. C. Tamargo, I. L. Kuskovsky, Feasibility of submonolayer ZnTe/ZnCdSe quantum dots as intermediate band solar cell material system, Solar Energy Materials & Solar Cells 117, 604 (2013).
S. Dhomkar, I. L. Kuskovsky, U. Manna, I. C. Noyan, M. C. Tamargo, Optimization of growth conditions of type-II Zn(Cd)Te/ZnCdSe submonolayer quantum dot superlattices for intermediate band solar cells, Journal of Vacuum Science & Technology B 31, 03C119 (2013).
J. De Jesus, T. A. Garcia, S. Dhomkar, A. Ravikumar, C. Gmachl, G. Chen, A. Shen, D. Ferizovic, M. Muñoz, M. C. Tamargo, Characterization of the three-well active region of a quantum cascade laser using contactless electroreflectance, Journal of Vacuum Science & Technology B 31, 03C134 (2013).
H. Ji, B. Roy, S. Dhomkar, R. T. Moug, M. C. Tamargo, A. Wang, I. L. Kuskovsky, Tuning Between Quantum-Dot- and Quantum-Well-Like Behaviors in Type II ZnTe Submonolayer Quantum Dots by Controlling Tellurium Flux during MBE Growth, Journal of Electronic Materials 42, 3297 (2013).
B. Roy, H. Ji, S. Dhomkar, F. J. Cadieu, L. Peng, R. Moug, M. C. Tamargo, I. L. Kuskovsky, Distinguishability of stacks in ZnTe/ZnSe quantum dots via spectral analysis of Aharonov-Bohm oscillations, European Physical Journal B 86, 31 (2013).
B. Roy, H. Ji, S. Dhomkar, F. J. Cadieu, L. Peng, R. Moug, M. C. Tamargo, Y. Kim, D. Smirnov, I. L. Kuskovsky, Enhancement and narrowing of the Aharonov-Bohm oscillations due to built-in electric field in stacked type-II ZnTe/ZnSe quantum dots: Spectral analysis, Physical Review B 86, 165310 (2012).
B. Roy, H. Ji, S. Dhomkar, F. J. Cadieu, L. Peng, R. Moug, M. C. Tamargo, I. L. Kuskovsky, Determination of excitonic size with sub-nanometer precision via excitonic Aharonov-Bohm effect in type-II quantum dots, Applied Physics Letters 100, 213114 (2012).
U. Manna, Q. Zhang, S. Dhomkar, I. F. Salakhutdinov, M. C. Tamargo, I. C. Noyan, G. F. Neumark, I. L. Kuskovsky, Radiative transitions in vertically correlated type-II ZnMgTe/ZnSe multilayer quantum dot structure, Journal of Applied Physics 112, 063521 (2012).