Spin Microscopy Lab

Dr. Phani Kumar

Principal Investigator

Research Interests

Nitrogen-vacancy (NV) spins in diamond, Quantum sensing, Atomic force microscopy, Nano-spin-mechanical systems (NSMS), Nanomagnetism, Hybrid quantum sensors, Nanoscale scanning diamond probes, Magnetic resonance imaging, Biosensing, Quantum technology, Confocal microscopy, Laser interferometry


Academics

Postdoc [July 2013 - November 2017]

Institute for Quantum Optics, University of Ulm, Germany

Advisor: Prof. Fedor Jelezko

Research: Quantum Sensing, Diamond Magnetometry, Nano-spin-mechanical Systems (NSMS)

Section on Quantum Physics and Information Technology, Technical University of Denmark, Copenhagen

Advisor: Prof. Ulrik Andersen

Research: Nanomechanics

Division of Physics and Applied Physics, Nanyang Technological University, Singapore

Research: Spin Centers in Silicon Carbide


PhD [Department of Physics, University of Basel, Switzerland (April 2009 - June 2013)]
Thesis: Magnetic resonance force microscopy: Harnessing nuclear spin fluctuations.
Advisor: Prof. Martino Poggio
Research: Apart from making contributions to setting up of a low temperature high vacuum magnetic resonance force microscopy (MRFM) setup, I explored a novel approach using MRFM to harness the naturally occurring random fluctuations in nanoscale ensembles of nuclear spins.


MSc [Micro and Nanosystems, ETH Zurich, Switzerland (October, 2006 - January, 2009)]
Thesis: Efficient coupling to photonic crystal cavities.
Advisor: Prof. Atac Imamoglu
Courses Credited:
Quantum Mechanics for Nanosystems, Advanced Optoelectronics, Quantum Optics, Quantum Systems for Information Technology, Magnetism: from the Atom to the Solid State, Advanced Solid State Physics, Statistical Physics, Semiconductor Nanostructures, Quantum Optics and Semiconductor Quantum Dots
Course Projects:
MATLAB simulations for gain calculations of quantum dot laser


BTech [Indian Institute of Technology, Madras (September, 2001 - July, 2005)]
Courses Credited: (GPA - 8.56/10)
Physics - I, Physics Lab - I, Electrodynamics, Physics Lab - II, Quantum Mechanics for Engineers, Semiconductor Physics, Dynamical Systems, Laser Theory, Mathematical Physics, Superconductivity and its Applications



Achievements

  • Pratibha scholarship awarded by Andhra Pradesh state government for BTech studies in IIT Madras
  • Indian Institutes of Technology-Joint Entrance Examination (IIT-JEE) 2001 Rank: 532 (out of 1,70,000+ students) for admission to IITs
  • Secured an All India Rank of 8 (99.81 percentile) in Joint Entrance Screening Test (JEST) Physics 2009 for admission to Ph.D programmes
  • Achieved a score of 890/1000 (90 percentile) in GRE Physics 2005, an examination taken by applicants for admission into graduate schools in USA

Research

SINGLE-SPIN MAGNETOMETRY


We develop nitrogen-vacancy (NV) spin-based diamond magnetometers capable of measuring the minute magnetic fields with high sensitivity and spatial resolution. Our aim is to utilize the diamond spins as scanning probes to spatially map the tiny magnetic fields on the nanoscale. This would allow us to obtain a greater understanding of the magnetic phenomena which are otherwise not discerned by global magnetization measurements due to spatial averaging.

Scanning Diamond Magnatometer

HYBRID NV-DIAMOND SENSORS


We also apply NV centers as nanoscale probes of stress, temperature and electric fields. Standard NV-diamond sensing devices when combined with the strategy of hybridization offer a huge potential for improving their sensitivity. Such hybrid quantum sensors may provide a novel approach for studying a broad range of physical processes on the nanoscale.

Publications

Scalable fabrication of single silicon vacancy defect arrays in silicon carbide using focused ion beam

Junfeng Wang, Xiaoming Zhang, Yu Zhou, Ke Li, Ziyu Wang, P. Peddibhotla, Fucai Liu, Sven Bauerdick,Axel Rudzinski, Zheng Liu, and Weibo Gao

ACS photonics, 2017, 4(5), 1054-1059

April 2017

Nanomechanical sensing using spins in diamond

M. S. J. Barson , P. Peddibhotla , P. Ovartchaiyapong, K. Ganesan, R. L. Taylor, M. Gebert, Z. Mielens,B. Koslowski, D. A. Simpson, L. P. McGuinness, J. McCallum, S. Prawer, S. Onoda, T. Ohshima, A. C.Bleszynski Jayich, F. Jelezko, N. B. Manson and M. W. Doherty

Nano Lett. (2017), 17 (3), 1496-1503

February 2017

Boundary between the thermal and statistical polarization regimes in a nuclear spin ensemble

B. E. Herzog, D. Cadeddu, F. Xue, P. Peddibhotla and M. Poggio

Appl. Phys. Lett.105, 043112 (2014)

August 2014

Harnessing nuclear spin polarization fluctuations in a semiconductor nanowire

P. Peddibhotla, Fei Xue, H. I. T. Hauge, S. Assali, Erik P. A. M. Bakkers and M. Poggio

Nature Physics 9, 631-635 (2013)

August 2013

Feedback cooling of cantilever motion using a quantum point contact transducer

M. Montinaro, A. Mehlin, H. S. Solanki, P. Peddibhotla, S. Mack, D. D. Awschalom and M. Poggio

Appl. Phys. Lett. 101, 133104 (2012)

September 2012

Measurement of statistical nuclear spin polarization in a nanoscale GaAs sample

Fei Xue, D. P. Weber, P. Peddibhotla, and M. Poggio

Phys. Rev. B 84, 205328 (2011)

November 2011

A geometry for optimizing nanoscale magnetic resonance force microscopy

Fei Xue, P. Peddibhotla, M. Montinaro, D. P. Weber, and M. Poggio

Appl. Phys. Lett. 98, 163103 (2011)

April 2011

Members

BS-MS Students


Name: Md Arshad

Email: mdarshad@iiserb.ac.in

Joined: July, 2019

Name: Subham Singh

Email: subham@iiserb.ac.in

Joined: July, 2019

Name: Ritesh Kumar Singh

Email: ritesh@iiserb.ac.in

Joined: July, 2019


Alumni


  1. Alen Philip (BS-MS)
  2. Basim S. S. (BS-MS)

Contact

Dr. Phani Kumar P.

Assistant Professor

Department of Physics

IISER Bhopal


Office:

Room No. 3, Academic Building - I

Bhauri, Bhopal - 462066

Phone: +91 755 669 1241

Email: phani@iiserb.ac.in

Location