Alexandros Gezerlis

Dr. Alexandros Gezerlis
Associate Professor and Colloquium Coordinator
Email: 
gezerlis@uoguelph.ca
Phone number: 
519-824-4120 x56755
Office: 
MacN 219
Summary: 

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Professional Experience

  • Associate Professor, Department of Physics, University of Guelph, 2017-
  • Assistant Professor, Department of Physics, University of Guelph, 2013-2017
  • Senior Postdoc and Herzberg Fellow, EMMI & Institute for Nuclear Physics, TU Darmstadt, 2012-2013
  • Research Associate, Department of Physics, University of Washington, 2009-2012
  • Graduate Research Assistant, Theoretical Division, Los Alamos National Laboratory, 2006-2009
  • Graduate Teaching & Research Assistant, Department of Physics, University of Illinois at Urbana-Champaign, 2003-2006

Education

  • Ph.D. in Physics, University of Illinois at Urbana-Champaign, 2009
  • M.Sc. in Physics, University of Illinois at Urbana-Champaign, 2005
  • Diploma in Electrical and Computer Engineering, National Technical University of Athens, 2003
Conference Year
Organizer of the ECT* workshop Nuclear physics meets condensed matter:
symmetry, topology, and gauge
2020
Lead organizer of the ECT* workshop Exploring nuclear physics with ultracold
atoms
2018
Co-organizer of the IPN Orsay workshop Bridging nuclear ab initio and
energy-density-functional theories
2017
Co-organizer of the 53rd Winter Nuclear and Particle Physics Conference 2016
Lead organizer of the 2015 TRIUMF Summer Institute 2015
Conference Chair of the 52nd Winter Nuclear and Particle Physics Conference 2015
Lead organizer of the ECT* workshop (with H4F support) Three-Body
Forces: from Matter to Nuclei
2014
Co-organizer of the 10-week INT Program Fermions From Cold Atoms To
Neutron Stars
2011

 

  • Research Excellence Award, 2017
    Office of Research & Office of the Provost, University of Guelph, Guelph, ON
  • Early Researcher Award, 2017
    Ministry of Research, Innovation and Science, Government of Ontario
  • NSERC Discovery Accelerator Supplement, 2016
    Sole awardee in all of nuclear and particle theory and experiment (1 out of 58)
    Natural Sciences and Engineering Research Council of Canada
  • Inaugural Herzberg Fellow, 2013
    Institut f¨ur Kernphysik, Technische Universit¨at Darmstadt, Darmstadt, Germany
  • Inducted into The Honor Society of Phi Kappa Phi, 2007
    University of Illinois at Urbana-Champaign Chapter, Urbana, IL
  • Jordan S. Asketh Award, 2005
    Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL
  • Incomplete List of Teachers Ranked as Excellent by their Students (Ranked Outstanding in 2003), 2003/2004
    University of Illinois at Urbana-Champaign, Urbana, IL

 

My area of research is quantum many-body theory, with an emphasis on fermions. My work spans the gamut from ultracold atomic gases to terrestrial nuclei, and on to the astrophysical objects known as neutron stars: from a peV scale up to MeVs. This includes two distinct fields of physics (nuclear and atomic) as well as two separate subfields of nuclear physics (nuclear structure and nuclear astrophysics).

The thread that unifies all these subjects is a focus on fermionic many-body theory, combined with an abiding interest in the observational and experimental grounding of such theoretical constructs. The systems I study are strongly interacting. Thus, I use microscopic simulation methods on modern supercomputers, along with more phenomenological approaches, to predict or postdict interesting physics.

Neutron Stars

These are ultracompact objects the study of which requires an understanding of many areas of physics. A neutron star can be thought of as a laboratory of macroscopic dimensions, containing nucleon matter under extreme conditions. Neutron stars exhibit properties not easily probed in terrestrial laboratories. Their structure is layered, with increasing theoretical uncertainty as one approaches the center of the star. I focus on the crust and core, using terrestrial experiments (see below) to constrain nuclear theory, while also trying to quantify the theoretical uncertainty of astrophysically relevant microscopic calculations.


From atoms to quarks

The interaction between nucleons arises from the fundamental theory of Quantum Chromodynamics. Regardless of their origins, nuclear forces are quite complicated: they depend on much more than the distance between the particles, while they also appear in three- and many- nucleon varieties. Nuclei are the finite systems emerging from these complicated interactions. The current frontier, experimentally attacked in facilities such as TRIUMF (Canada), FAIR (Germany), and FRIB (USA), relates to neutron-rich nuclei. Such studies are closely connected to the physics of neutron-star crusts mentioned above, as these forefront nuclei contain a large fraction of neutrons. I am interested both in the phenomenology of pairing in heavy nuclei and in microscopic approaches to nuclei.


Ultracold atoms

For most of the 20th century the study of pairing using atoms was mainly focused on the fermionic and bosonic varieties of Helium. Then, experimentalists learned how to manipulate alkali gases (bosons in the 1990s, fermions in the 2000s). These systems are especially clean (no unwanted impurities) and can be directly probed. Thus, they can help both toward finding new states of matter and in the effort to simulate the complicated systems appearing in nuclear and condensed-matter physics. Numerous laboratories around the world use cold atoms (such as Li and K) to probe strongly interacting physics. I am interested in the overlap of such atomic systems with the physics of nuclei and neutron stars (e.g. population and mass imbalanced mixtures). 


Quantum Monte Carlo

Microscopic simulations offer unprecedented access to strongly interacting systems. Though physical intuition can (and should) be built at weak coupling, the final answer in many cases requires addressing the full problem head on. Among other methods, I use Diffusion Monte Carlo (DMC), Auxiliary-Field Diffusion Monte Carlo (AFDMC), and Path Integral Monte Carlo (PIMC) to calculate ground-state and thermodynamic properties of interacting nucleons or atoms. These simulations tackle a few dozen up to a thousand particles and thus need to be performed on machines ranging from a department cluster to a modern supercomputer. 

Refereed Journal Publications

 

  • Non-perturbative Extraction of the Effective Mass in Neutron Matter
    Nawar Ismail, Mateusz Buraczynski, and Alexandros Gezerlis
    submitted to Phys. Rev. Lett. [arXiv:1901.00870]
  • Symmetry restoration in mixed-spin paired heavy nuclei
    Ermal Rrapaj, A. O. Macchiavelli, and Alexandros Gezerlis
    to appear in Phys. Rev. C [arXiv:1807.09294]
  • Path Integral Monte Carlo study of particles obeying quantum mechanics and classical statistics
    William G. Dawkins and Alexandros Gezerlis
    Phys. Rev. A 96, 043619 (2017) [arXiv:1707.01113]
  • Quantum Monte Carlo calculations of light nuclei with local chiral two- and three-nucleon interactions
    J. E. Lynn, I. Tews, J. Carlson, S. Gandolfi, A. Gezerlis, K. E. Schmidt, A. Schwenk
    Phys. Rev. C 96, 054007 (2017) [arXiv:1706.07668]
  • Fermions in Two Dimensions: Scattering and Many-Body Properties
    Alexander Galea, Tash Zielinski, Stefano Gandolfi, and Alexandros Gezerlis
    J Low Temp Phys 189, 451 (2017) [arXiv:1705.09310]
  • Ab initio and phenomenological studies of the static response of neutron matter
    Mateusz Buraczynski and Alexandros Gezerlis
    Phys. Rev. C 95, 044309 (2017) [arXiv:1608.03598]
  • Quantum Monte Carlo calculations of two neutrons in finite volume
    P. Klos, J. E. Lynn, I. Tews, S. Gandolfi, A. Gezerlis, H.-W. Hammer, M. Hoferichter, A. Schwenk
    Phys. Rev. C 94, 054005 (2016) [arXiv:1604.01387]
  • Diffusion Monte Carlo study of strongly interacting 2D Fermi gases
    Alexander Galea, Hillary Dawkins, Stefano Gandolfi, and Alexandros Gezerlis
    Phys. Rev. A 93, 023602 (2016) [arXiv:1511.05123]
  • Static Response of Neutron Matter
    Mateusz Buraczynski and Alexandros Gezerlis
    Phys. Rev. Lett. 116, 152501 (2016) [arXiv:1510.06417]
  • Probing mixed-spin pairing in heavy nuclei
    Brendan Bulthuis and Alexandros Gezerlis
    Phys. Rev. C 93, 014312 (2016) [arXiv:1509.04295]
  • Chiral Three-Nucleon Interactions in Light Nuclei, Neutron-α Scattering, and Neutron Matter
    J. E. Lynn, I. Tews, J. Carlson, S. Gandolfi, A. Gezerlis, K. E. Schmidt, A. Schwenk
    Phys. Rev. Lett. 116, 062501 (2016) [arXiv:1509.03470]
  • Quantum Monte Carlo calculations of neutron matter with chiral three-body forces
    I. Tews, S. Gandolfi, A. Gezerlis, A. Schwenk
    Phys. Rev. C 93, 024305 (2016) [arXiv:1507.05561]
  • Neutron Matter from Low to High Density
    Stefano Gandolfi, Alexandros Gezerlis, J. Carlson
    Annu. Rev. Nucl. Part. Sci. 65, 303 (2015) [arXiv:1501.05675]
  • Quantum Monte Carlo calculations of light nuclei using chiral potentials
    J. E. Lynn, J. Carlson, E. Epelbaum, S. Gandolfi, A. Gezerlis, A. Schwenk
    Phys. Rev. Lett. 113, 192501 (2014) [arXiv:1406.2787]
  • Local chiral effective field theory interactions and quantum Monte Carlo applications
    A. Gezerlis, I. Tews, E. Epelbaum, M. Freunek, S. Gandolfi, K. Hebeler, A. Nogga, A. Schwenk
    Phys. Rev. C 90, 054323 (2014) [arXiv:1406.0454]
  • The neutron polaron as a constraint on nuclear density functionals
    M. M. Forbes, A. Gezerlis, K. Hebeler, T. Lesinski, A. Schwenk
    Phys. Rev. C 89, 041301(R) (2014) [arXiv:1308.1691]
  • Quantum Monte Carlo Calculations with Chiral Effective Field Theory Interactions
    A. Gezerlis, I. Tews, E. Epelbaum, S. Gandolfi, K. Hebeler, A. Nogga, A. Schwenk
    Phys. Rev. Lett. 111, 032501 (2013) [arXiv:1303.6243]
  • Quantum Monte Carlo approaches to nuclear and atomic physics
    J. Carlson, Stefano Gandolfi, and Alexandros Gezerlis
    Prog. Theor. Exp. Phys., 01A209 (2012) [arXiv:1210.6659]
  • Effective-Range Dependence of Resonantly Interacting Fermions
    Michael McNeil Forbes, Stefano Gandolfi, and Alexandros Gezerlis
    Phys. Rev. A 86, 053603 (2012) [arXiv:1205.4815]
  • Energy spectrum and effective mass using a non-local 3-body interaction
    Alexandros Gezerlis and G. F. Bertsch
    Phys. Rev. C 85, 037303 (2012) [arXiv:1111.2083]
  • Phase separation in low-density neutron matter
    Alexandros Gezerlis and Rishi Sharma
    Phys. Rev. C 85, 015806 (2012) [arXiv:1111.0298]
  • Mixed-Spin Pairing Condensates in Heavy Nuclei
    Alexandros Gezerlis, G. F. Bertsch, and Y. L. Luo
    Phys. Rev. Lett. 106, 252502 (2011) [arXiv:1103.5793]
  • Spin-polarized low-density neutron matter
    Alexandros Gezerlis
    Phys. Rev. C 83, 065801 (2011) [arXiv:1012.4464]
  • Resonantly Interacting Fermions In A Box
    Michael McNeil Forbes, Stefano Gandolfi, and Alexandros Gezerlis
    Phys. Rev. Lett. 106, 235303 (2011) [arXiv:1011.2197]
  • Effective 3-Body Interaction for Mean-Field and Density-Functional Theory
    Alexandros Gezerlis and G. F. Bertsch
    Phys. Rev. Lett. 105, 212501 (2010) [arXiv:1008.4103]
  • Low-density neutron matter 
    Alexandros Gezerlis and J. Carlson
    Phys. Rev. C 81, 025803 (2010) [arXiv:0911.3907]
  • Heavy-Light Fermion Mixtures at Unitarity
    Alexandros Gezerlis, S. Gandolfi, K. E. Schmidt, and J. Carlson
    Phys. Rev. Lett. 103, 060403 (2009) [arXiv:0901.3148]
  • Strongly paired fermions: Cold atoms and neutron matter 
    Alexandros Gezerlis and J. Carlson
    Phys. Rev. C 77, 032801(R) (2008) [arXiv:0711.3006]

Invited Book Chapters

 

  • Pairing and superfluidity of nucleons in neutron stars
    A. Gezerlis, C. J. Pethick, and A. Schwenk
    chapter in "Novel Superfluids, Volume 2", edited by K. H. Bennemann and J. B. Ketterson, (Oxford University Press, 2014) [arXiv:1406.6109]
  • Superfluid Pairing in Neutrons and Cold Atoms
    J. Carlson, Stefano Gandolfi, and Alexandros Gezerlis
    chapter in "Fifty Years of Nuclear BCS: Pairing in Finite Systems", edited by R. A. Broglia and V. Zelevinsky, (World Scientific, 2013) [arXiv:1204.2596]
  • Terrestrial and Astrophysical Superfluidity: Cold Atoms and Neutron Matter
    Alexandros Gezerlis and J. Carlson
    chapter in "Neutron Star Crust", edited by C. A. Bertulani and J. Piekarewicz, (Nova Publishers, 2012) [arXiv:1109.4946]
Name Role
Matt Buraczynski PhD Candidate
Nawar Ismail MSc Candidate
Sam Martinello MSc Candidate
Georgios Palkanoglou MSc Candidate
Anish Verma MSc Candidate
Bernie Ross Undergraduate Research Assistant
Jay Florica Undergraduate Research Assistant

 

Alumni

Postdoctoral Fellows

  • Dr. Ermal Rrapaj (11/2016 - 09/2018)

PhD Students

MSc Students

  • Brendan Bulthuis (09/2013 - 08/2015)
  • Alex Galea (09/2013 - 01/2016)
  • Tash Zielinski (05/2015 - 08/2018)
  • Matt Buraczynski (09/2015 - 08/2018)
  • William Dawkins (05/2015 - 05/2019)

Undergraduate Research Students

  • Nichloas van Heijst (09/2018 - 12/2018) 
  • Paul Foley (09/2019 - 04/2019)
  • Jordan Atchison (05/2015 - 04/2016)
  • Hillary Dawkins (09/2013 - 04/2014)
  • Brady Skene (09/2016 - 01/2017)  
  • Kaitlin Williams (09/2017 - 04/2018)
  • April 2019
    Congratulations to Anish Verma on receiving an NSERC CGS Master's Scholarship!
  • March 2019
    Congratulations to Matt Buraczynski on receiving an NSERC Alexander Graham Bell CGS Doctoral Scholarship!
  • March 2019
    Congratulations to Jay Florica on receiving an NSERC USRA award!
  • March 2018
    Congratulations to Nawar Ismail and Bernie Ross on receiving NSERC USRA awards!
  • January 2018
    Congratulations to Ermal Rrapaj on getting an N3AS postdoc position!
  • August 2017
    Congratulations to Nawar Ismail on winning 1st place overall in the College Poster Session!
  • February 2017
    Congratulations to Nawar Ismail and Bernie Ross on receiving NSERC USRA awards!
  • February 2017
    Congratulations to Will Dawkins on receiving a Queen Elizabeth II Graduate Scholarship!
  • May 2016
    Congratulations to Matt Buraczynski on receiving an Ontario Graduate Scholarship!
  • April 2016
    Congratulations to Will Dawkins on receiving an NSERC CGS Master's Scholarship!
  • February 2016
    Congratulations to Bernie Ross on receiving an NSERC USRA award!
  • June 2015
    Congratulations to Matt Buraczynski on receiving the Governor General's Silver Medal for being the top undergraduate student in the University!
  • April 2015
    Congratulations to Matt Buraczynski on receiving an NSERC CGS Master's Scholarship!
  • February 2015
    Congratulations to Jordan Atchison and Will Dawkins on receiving NSERC USRA awards!
  • February 2014
    Congratulations to Matt Buraczynski on receiving an NSERC USRA award!