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Research Scientist

Location:
Rapid City, SD
Posted:
February 22, 2015

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Resume:

Dr. Madhusudan A. Savaikar

***E Anamosa St #*** acofbj@r.postjobfree.com

Rapid City, SD 57701 1-906-***-****

QUALIFIED BY: Seven months of research experience in single-molecule fluorescence microscopy, image

processing, localization, and seven years of research experience in experimental single-electron device

simulations using Monte Carlo techniques. Nano-device physics, super-resolution microscopy, and imaging

expertise with hands-on experience in optical and electron microscopy, set up of optical systems, algorithm

design, and software development for device simulations signifying multidisciplinary problem-solving skills.

EDUCATION

Ph.D. in Engineering Physics, Michigan Technological University (MTU), Houghton, Michigan

GPA – 3.63 / 4.0, Fall 2013.

Dissertation Title: Stochastic Charge Transport in Multi-island Single-Electron Tunneling

Devices.

RESEARCH EXPERIENCE

Research Scientist I (Postdoctoral Researcher in Nanoscience and Nanoengineering), South Dakota

School of Mines and Technology, Rapid City, SD, 07/2014-present.

NSF Project Title: Imaging Cellulose-Carbohydrate Binding Module Interactions with Nanometer Resolution

using Single Molecule Fluorescence Methods.

Set up a Total Internal Reflection Fluorescence Microscopy (TIRFM) system consisting of

fluorescence microscope, lasers, and other optical devices such as beam expanders, beam splitters,

dichroic mirrors, LabVIEW-controlled shutters, etc., and aligned different laser beams for super

resolution imaging of biological samples.

Prepared biological samples such as caged fluorescein (CF), and carbohydrate-binding

modules (CBMs) tagged with green fluorescent proteins (GFPs) and photo-activated fluorescent

protein PAmCherry on Valonia cellulose nanocrystals for imaging.

Designed and carried out numerous Photo-Activated Localization Microscopy (PALM)

experiments on the above-mentioned samples using the TIRFM system after having optimized the

parameters.

Extensively processed, and analyzed the imaged data in ImageJ, IDL, and MATLAB using

particle tracking algorithm for selecting and localizing single molecules to an accuracy of ~ 10nm.

Investigated different properties such as nearest-neighbor distribution, pair-correlation

function, and binding specificities of the CBMs onto cellulose microfibrils that influence the

accessibility of cellulase enzymes responsible for hydrolyzing the cellulose.

The characteristic features in CBM-valonia samples were reconstructed from the imaged data

showing nearest-neighbor distribution of ~ 100nm and particles localized to ~ 10nm.

Ph.D. Dissertation Research: Stochastic Charge Transport in Multi-island Single-Electron Tunneling

Devices, 01/2007-12/2013.

Dissertation Objective: Simulation of single-electron tunneling devices with an emphasis on explaining the

experimentally observed device properties, investigate the microscopic details, and suggest experiments to

test the conclusions drawn from the simulation studies.

Performed extensive single-electron device (SED) and single-electron transistor (SET)

simulations using SED simulation software SIMON, 2007-2008.

Savaikar, page 1 of 5

o Examined critical issues such as the circuit model, capabilities, and limitations of SIMON.

o Circuit model limits SIMON’s capabilities in explaining the terminal device characteristics in

terms of its physical features.

Development of a theoretical model and its implementation in the development of the

simulator, MITS, to model and simulate SEDs and SETs consisting of multiple nano-islands

(quantum dots), 2008-2010.

o Developed the theoretical framework based on semi-classical tunneling theory and kinetic

Monte Carlo method for multi-island device simulations.

o Designed and developed a new, robust multi-island transport simulator, MITS, which can

elucidate key linkages between the physical characteristics of the system and the resulting

current-voltage (IV) device characteristics.

o Developed parallel computing capabilities in MITS that decreased the simulation time thereby

enhancing MITS’s capabilities which are beneficial for high temperature device simulations.

Testing and validation of MITS model by simulating the experimental devices described

in the literature, 2010-2011.

o Tested MITS’s capabilities and validated its model by simulating the experimental devices

described in the literature consisting of a single-island and a one-dimensional (1D) chain device.

o Successfully performed the microscopic investigations of charge transport in a single-island

device and proposed the physical mechanisms that lead to the Coulomb blockade (CB) and the

Coulomb staircase (CS) structure in the device IV characteristics.

o Investigated the effects of gate voltage (VG), temperature (T), background charge, and the

structural disorder on the device characteristics such as the device threshold voltage ( Vth), current

staircase, current on/off ratio, and the Coulombic gate oscillations.

o In a single-island device whose physical features are well characterized, it is possible to

analytically predict the device characteristics by estimating the device current, device Vth,

staircase step positions, and width and height of the steps in the IV.

Comprehensive investigation of charge transport in disordered one-dimensional (1D)

chains of metallic nano-islands deposited on an insulating 1D substrate using MITS, 2011-

2012.

o Modeled and extensively simulated an experimental device fabricated by the collaborators that

consisted of a one-dimensional chain of gold nano-islands deposited on an insulating boron nitride

nanotube.

o Analyzed the effect of chain disorder arising from the distribution in island radii and junction

widths on junction charging energies and the device characteristics.

o Critically examined the effect of change in applied source-drain bias on junction potential

drops and tunneling junction resistances in the disordered chain.

o Investigated the effects of chain length on the device Vth and the current staircase structure.

With increasing chain length, the device Vth increases and the staircase steps are observed to be

more prominent in longer chains; properties observed in experimental devices.

o Examined the device IV scaling behavior; the characteristic behavior observed in experimental

devices. Investigated effects of disorder and the chain length on the scaling behavior.

o Investigated the effect of defects on the device characteristics and the Vth. Vth increases with

the increase in the number of defects in the device chain.

o Thoroughly probed and analyzed thermal effects on the current staircase, device V th, and the

device current at high and low biases for different chain lengths. Increase in temperature

decreases the device Vth and modulates the current staircase. Similar observations have been

made in experimental works.

o Proposed a new hypothesis that may explain the observed non-linear decrease in the device

threshold voltage with the increasing temperature in 1D chains.

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o Successfully performed the microscopic investigation of charge transport in multi-island 1D

chain devices.

o Proposed and investigated new physical mechanisms that lead to the Coulomb blockade (CB)

giving a well-defined device threshold voltage (Vth), and the Coulomb staircase (CS) in multi-island

device IV characteristics.

o Overall IV characteristics in a strongly-coupled multi-island device with a random distribution in

island sizes and inter-island spacings are a result of a complex interplay among those factors that

affect the tunneling rates which are fixed a priori (island sizes, inter-island separations,

temperature, background charge, gate bias, etc.), and the evolving charge state of the system,

which changes as the applied source-drain bias (VSD) is changed.

Charge transport simulations in MITS of two-dimensional (2D) systems consisting of

randomly positioned multiple metallic nano-islands, 2012-2013.

o Generated physical models of experimental devices using hard-sphere Metropolis Monte

Carlo simulation methods with desired density of nano-islands and packing fraction.

o Examined the effect of distribution in inter-island spacings on the conducting paths in the

devices.

o Demonstrated the existence of a dominant conducting path (DCP) in a disordered 2D device

structure that carries majority of the device current, and makes the device effectively behave as a

quasi-1D device.

o Investigated the effects of changes in source-drain bias voltage (VSD), gate voltage (VG) and

temperature (T) on the DCP, and the overall device IV characteristics.

o The DCP in a highly disordered system is sufficiently robust to withstand changes in V SD, VG,

and T although the local currents flowing through the DCP junctions may change.

o The increase in T may affect the DCP, and open new conducting paths depending on the

island sizes and the amount of disorder present in the system.

o Simulated the device behavior under the influence of lateral gate, and successfully

demonstrated the change in the device Vth with the change in VG.

o Demonstrated the decrease in the device Vth with the increasing temperature; property also

observed in experimental devices.

o Simulated a quasi-1D device made of only the DCP islands and the DCP junctions after

etching away the non-participating islands in the device. Investigated gate and thermal effects on

quasi-1D device characteristics.

o The quasi-1D device exhibits better gate control with smooth variation of V th with VG and a

larger device conductance. It also shows a smoother translational shift in the IV curves towards

lower VSD values with the increasing temperature.

o The quasi-1D structures fabricated after having etched away the non-participating islands from

multi-dimensional structures could be a better choice over multi-dimensional and 1D device

structures for switching applications and transistor operations.

Suggested specific experiments to the collaborators that may test the conclusions

drawn from the simulation studies, 01/2014-04/2014.

Research Project Trainee, National Institute of Oceanography, Goa, India, 1999-

2000.

M.Sc. Project Team Leader: Repair and assembling of PVD unit, 01/1999-08/1999.

o Repaired and replaced parts of an old non-functional PVD unit.

o Assembled and operationalized the unit.

PROJECT MANAGEMENT EXPERIENCE

Graduate Student Research, Michigan Tech, 2007-2013

Savaikar, page 3 of 5

Planned and coordinated four research projects in consultation with the

computational research group.

Initiated and coordinated collaborations with experimental groups in the department

of electrical and computer engineering, and the department of physics to address experimental device

issues that may guide in improving the device design.

Wrote a proposal to NERSC, a division of LBNL, for computing time at its

supercomputing facilities.

TEACHING EXPERIENCE

Graduate Teaching Assistant, Department of Physics, Michigan Tech, 2005-2013

Faculty in Applied Physics / Physics, 2002-2005

o Rayeshwar Institute of Engineering and Technology (Affiliated to Goa University), Goa, India,

2004-2005

o Goa College of Engineering (Affiliated to Goa University), Goa, India, 2003-2004

o Institute of Shipbuilding and Technology, Goa, India, 2003

o SES Higher Secondary School, Goa, India, 2002-2003

BUSINESS EXPERIENCE

Supervised family agribusiness, Goa, India, 2000-2002

Turned the business cost effective by employing methods such as assigning

individual responsibilities to the employees and enforcing stricter time schedules.

Motivated employees to be more productive by giving performance-based

incentives.

Reduced the costs and increased the profits by increasing yield per acre and

plugging the leaks.

GRADUATE COURSEWORK

Solid State Devices, Solid State and Quantum Physics, Microfabrication Lab, Advanced

Scanning Electron Microscopy, Computational Physics, Material Physics, Electronic Materials,

Selected Topics in Nanotechnology, Electrodynamics, Electricity and Magnetism, Classical, Statistical,

and Mathematical Physics, Physics and Electronics Labs.

SKILLS and TECHNIQUES

Systems, Programming Skills, and Software Packages

LabVIEW, LaTeX, EndNote,

Windows, Linux, Mac OS X Origin

FORTRAN, C, C++ Image processing software

MATLAB / Simulink, IDL, MathematicaImageJ

Spectroscopic software WinSpec

SED simulation software packages SIMON,

MS office suite, iWork office suite

MOSES, MITS

Adobe Acrobat, Photoshop, etc.

Fabrication, Characterization, Microscopy, and Imaging

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Total Internal Reflection

Scanning Electron Microscopy (SEM),

Fluorescence (TIRF) Microscopy

Transmission Electron Microscopy (TEM) Super-Resolution Microscopy

Focused Ion Beam (FIB) Photo-Activated Localization

Microscopy

Device IV characterization using SPA

Optical set-up, laser beam

4200SCS

alignment

Computing, Modeling, and Simulation

Device modeling and simulations

Theoretical development, algorithm Image processing, feature selection,

design, mathematical modeling localization, particle tracking

Physics-based modeling, multi-physics High performance serial and parallel

simulations, software tool development computing

Monte Carlo techniques Physics and engineering simulations

Statistical and numerical techniques Solid state, material, and quantum physics

Optics and electronics

Stochastic charge transport

simulations

OTHER ACCOMPLISHMENTS / AWARDS / ACTIVITIES / INTERESTS

The research work on boron nitride nanotubes functionalized with gold quantum dots received

wide coverage in the news outlets such as Phys.org, CBS Detroit, and IEEE Spectrum.

http://www.altmetric.com/details.php?domain=onlinelibrary.wiley.com&citation_id=1574757

Awarded travel grant, and the departmental Miles fellowship for fall 2013.

Other interests include business, sports, politics, debates, reading, driving, and traveling.

PROFESSIONAL MEMBERSHIPS

APS member IEEE member MRS member

RESEARCH PUBLICATIONS

Madhusudan A. Savaikar, Douglas Banyai, Paul L. Bergstrom, and John A. Jaszczak,

“Simulation of charge transport in multi-island tunneling devices: Application to disordered one-

dimensional systems at low and high biases,” J. Appl. Phys. 114, 114504 (2013).

Lee, C. H., Qin, S., Savaikar, M. A., Wang, J., Hao, B., Zhang, D., Banyai, D., Jaszczak, J. A.,

Clark, K. W., Idrobo, J.-C., Li, A.-P., and Yap, Y. K., “Room-Temperature Tunneling Behavior of Boron

Nitride Nanotubes Functionalized with Gold Quantum Dots,” Adv. Mater. 25, 4544 (2013).

J. A. Jaszczak, M. A. Savaikar, D. R. Banyai, Boyi Hao, Dongyan Zhang, P. L. Bergstrom, A-

P. Li, J.-C. Idrobo, and Y. K. Yap, “Simulation of Charge Transport in Disordered Assemblies of Metallic

Nano-Islands: Application to Boron Nitride Nanotubes Functionalized with Gold Quantum Dots,” MRS

Proceedings, 17, 1700 (2014).

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “Physical Mechanisms

Leading to the Coulomb Blockade and Coulomb Staircase Structures in Strongly Coupled Multi-Island

Single-Electron Devices,” submitted.

Boyi Hao, Anjana Asthana, Paniz Khanmohammadi Hazaveh, Paul L. Bergstrom, Douglas

Banyai, Madhusudan A. Savaikar, John A. Jaszczak, and Yoke Khin Yap, “New Flexible Channels

for Tunneling Field Effect Transistors by Quantum Dots Functionalized Boron Nitride Nanotubes,”

submitted.

Savaikar, page 5 of 5

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “Analytical Study of

Charge Transport in a Single-island Transistor Device,” in preparation.

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “Thermal Effect on the

Coulomb Blockade Behavior of a One Dimensional Chain Device,” in preparation.

PROFESSIONAL PRESENTATIONS

John A. Jaszczak, Madhusudan A. Savaikar, Banyai R. Banyai, Boyi Hao, Zhang Dongyan,

Paul L. Bergstrom, An-Ping Li, Juan-Carlos Idrobo, Yoke Khin Yap, “Simulation of Charge Transport in

Disordered Assemblies of Metallic Nano-Islands: Application to Boron Nitride Nanotubes

Functionalized with Gold Quantum Dots (QDs-BNNTs),” invited talk, MRS spring meeting, San

Francisco, CA, April 21-25, 2014, Symposium MM3.01.

Madhusudan A. Savaikar, “Stochastic Charge Transport in Multi-island Single-electron

Tunneling Devices,” invited talk, Nano science and engineering seminar, SDSMT, Rapid City, SD,

February 06, 2014.

Madhusudan A. Savaikar, “Single-electron Device Behavior,” invited talk to the solid-state

device class, Department of electrical and computer engineering, Michigan Tech, Houghton, MI, April

04,10, 2014.

Madhusudan A. Savaikar, Douglas Banyai, Yoke Khin Yap, Paul L. Bergstrom, and John A.

Jaszczak, “Modeling of Charge Transport in a One-Dimensional Chain of Metallic Nano-islands on an

Insulating Wire: The Effect of Chain-length and Temperature on Device Characteristics,’’ colloquium

talk, graduate student council research colloquium, Michigan Tech, Houghton, MI, spring 2013.

Madhusudan A. Savaikar, Douglas Banyai, Paul L. Bergstrom, and John A. Jaszczak,

“Modeling of Charge Transport in a One-Dimensional Chain of Metallic Nano-islands on an Insulating

Wire: The Effect of Chain-length and Temperature on Device Characteristics,” poster presentation,

MRS fall meeting, Boston, MA, November 25-30, 2012, Paper FF13.18.

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “Development of MITS:

Testing, Validation, and Application to the Simulation of IV Behavior in a 1D Chain of Islands,”

colloquium talk, graduate physics research colloquium, Michigan Tech, Houghton, MI, spring 20012.

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “Modeling of Multi-

Island Single-Electron Transistor (SET) Devices,” colloquium talk, graduate physics research

colloquium, Michigan Tech, Houghton, MI, spring 20011.

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “IV Behavior of Multi-

Island Single-Electron Devices using SIMON,” colloquium talk, graduate physics research colloquium,

Michigan Tech, Houghton, MI, spring 2010.

Madhusudan A. Savaikar, Paul L. Bergstrom, and John A. Jaszczak, “Conduction through

Multi-Dot Quantum System,” poster presentation, graduate physics research colloquium, Michigan

Tech, Houghton, MI, spring 2008.

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