# Alexandros Gezerlis

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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 ultracoldatoms |
2018 |

Co-organizer of the IPN Orsay workshop Bridging nuclear ab initio andenergy-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-BodyForces: from Matter to Nuclei |
2014 |

Co-organizer of the 10-week INT Program Fermions From Cold Atoms ToNeutron 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 textbook “Numerical Methods in Physics with Python” was published by Cambridge University Press in August 2020.

For more info on the book and my other activities, see www.numphyspy.org

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 |
---|---|

Nawar Ismail | Research Assistant |

Matt Buraczynski | PhD Candidate |

Jayani Dissanayake | PhD Candidate |

Georgios Palkanoglou | PhD Candidate |

Bernie Ross | MSc Candidate |

Anish Verma | MSc Candidate |

## Alumni

### Postdoctoral Fellows

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

### PhD Students

### MSc Students

**Sam Martinello**(01/2020)**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**(05/2016 - 05/2019)**Georgios Palkanoglou**(01/2017 - 08/2019)

### Undergraduate Research Students

**Ryan Curry**(05/2020 - )**Jordan Atchison**(05/2015 - 04/2016)**Matt Buraczynski**(05/2014 - 08/2014)**Hillary Dawkins**(09/2013 - 04/2014)**William Dawkins**(05/2015 - 08/2015)**Jay Florica**(05/2019 - 08/2019)**Paul Foley**(09/2019 - 04/2019)**Bernard Ross**(05/2018-08/2018)**Brady Skene**(09/2016 - 01/2017)**Nicholas van Heijst**(09/2018 - 12/2018)**Kaitlin Williams**(09/2017 - 04/2018)

**May 2020**

Congratulations to Anish Verma on receiving an Ontario Graduate Scholarship!

Up and Atom - CEPS Research Profile**January 2020**

Congratulations to Anish Verma on being awarded a Mitacs Accelerate internship!**September 2019**

Congratulations to Nawar Ismail on receiving an NSERC CGS Master's Scholarship!**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!