Chalkboard with research

Research

In addition to supporting the faculty, postdoctoral researchers, and graduate students involved in this research at the Institute, FTPI also hosts short-term and long-term visitors and organizes workshops on topics of acute interest in the major areas of study.

High Energy Theory & Particle Astrophysics

The High Energy Theory Group focuses on understand the fundamental forces of nature and cosmology. The unification of the electromagnetic and weak nuclear force is well understood and is continually being tested experimentally. Among the objectives of the group in Minnesota is to push our understanding beyond the Standard Model of electroweak interactions. The strong nuclear force is inherently more complicated and understand the nature of strongly interacting systems  is another major objective of the group.

Particle Astrophysics and Cosmology is another aspect of High Energy theory as the Universe provides a laboratory for studying particle interactions at energies much higher than can be achieved experimentally. Topics which are actively pursued include, inflation, the baryon asymmetry, dark matter, nucleosynthesis and large scale structure.

Condensed Matter Theory

As condensed matter theorists, one of our main goals is to understand how the microscopic behavior of a very large number of atoms or molecules is related to the macroscopic properties of solids and liquids. While this certainly applies to objects common in our daily lives, such as kitchen salt or water, we are also interested in quantum versions of solids, liquids, and gases. For example, the properties of many metals are well described in terms of a gas of nearly independent electrons, whereas in other systems the electron-electron interaction is so significant that they behave as strongly correlated quantum liquids.

At first sight, the problem may seem deceivingly straightforward, after all, the ions and electrons forming the atoms only talk to each other via the good old electrostatic repulsion. However, it turns out that the quantum-mechanical collective behavior of condensed matter systems is often very different than just the simple sum of its constituents. This phenomenon, called emergence, is behind many unique and fascinating properties, among which superconductivity is perhaps the best known.

Condensed matter theory is a very broad area, that ranges from concrete applications to more abstract models. At the University of Minnesota, we have a vibrant condensed matter theory group working on a diverse set of topics, such as quantum materials, superconductivity, liquid crystals, quantum magnets, topological quantum matter, disordered systems, and non-equilibrium physics. We also enjoy frequent collaborations with the condensed matter experimental group, creating an engaging atmosphere to perform research in this field.

Recent Publications

Title

Authors

Journal

Solar Reflection of Dark Matter

Haipeng An, Haoming Nie, Maxim Pospelov, Josef Pradler, Adam Ritz

 

Improved Indirect Limits on Muon EDM

Yohei Ema, Ting Gao, Maxim Pospelov

 

Smoke and Mirrors: Neutron Star Internal Heating Constraints on Mirror Matter

David McKeen, Maxim Pospelov, Nirmal Raj

Phys. Rev. Lett. 127, 061805 (2021)

Search for Topological Defect Dark Matter Using the Global Network of Optical Magnetometers for Exotic Physics Searches (GNOME)

Samer Afach et. al. (Pospelov)

 

Feebly-Interacting Particles: FIPs 2020 Workshop Report

Prateek Agrawal et. al. (Pospelov)

 

Terrestrial Probes of Electromagnetically Interacting Dark Radiation

Jui-Lin Kuo, Maxim Pospelov, Josef Pradler

Phys. Rev. D 103, 115030 (2021)

Cosmological and Astrophysical Probes of Dark Baryons

David McKeen, Maxim Pospelov, Nirmal Raj

Phys. Rev. D 103, 115002 (2021)

Gravitational Production of Dark Matter during Reheating

Yann Mambrini, Keith Olive

Phys. Rev. D 103, 115009 (2021)

Disorder Effects in Topological Insulator Nanowires

Yi Huang, Boris Shklovskii

Phys. Rev. B 104, 054205 (2021)

Metal-Insulator Transition in n-type Bulk Crystals and Films of Strongly Compensated SrTiO3

Yi Huang, Y. Ayino, Boris Shklovskii

Phys. Rev. Materials 5, 044606 (2021)

Flipped gμ2

John Ellis, Jason Evans, Natsumi Nagata, Dimitri Nanopoulos, Keith Olive

 

Impact of Current Results on Nucleosynthesis

Keith Olive

 

Disorder Effects in Topological Insulator Thin Films

Yi Huang, Boris Shklovskii

Phys. Rev. B 103, 165409 (2021)

A Minimal Supersymmetri SU(5) Missing-Partner Model

John Ellis, Jason Evans, Natsumi Nagata, Keith Olive

Eur. Phys. J. C 81, 543 (2021)

Slow and Safe Gravitinos

Emilian Dudas, Marcos Garcia, Yann Mambrini, Keith Olive, Marco Peloso, Sarunas Verner

Phys. Rev. D 103, 123519 (2021)

On the Realization of WIMPflation

Marcos Garcia, Yann Mambrini, Keith Olive, Sarunas Verner

 

A Comprehensive Chemical Abundance Analysis of the Extremely Metal Poor Leoncino Dwarf Galaxy (AGC 198691)

Erik Aver et. al. (Olive)

 

One-dimensional Scattering of Two-dimensional Fermions Near Quantum Criticality

Dimitri Pimenov, Alex Kamenev, Andrey Chubukov

Phys. Rev. B 103, 214519 (2021)

Quasiparticle Scattering in a Superconductor Near a Nematic Critical Point - Resonance Mode and Multiple Attractive Channels

Dimitri Pimenov, Alex Kamenev, Andrey Chubukov

 

Interplay Between Superconductivity and non-Fermi Liquid at a Quantum-critical Point in a Metal: V. The γ Model and its Phase Diagram. The case γ=2

Yi-Ming Wu, Shang-Shun Zhang, Artem Abanov, Andrey Chubukov

Phys. Rev. B 103, 184508 (2021)

Pseudogap and Superconductivity Emerging from Quantum Magnetic Fluctuations: a Monte Carlo Study

Weilun Jiang, Yuzhi Liu, Avraham Klein, Yuxuan Wang, Kai Sun, Andrey Chubukov, Zi Yang, Meng

 

The Dynamical Exponent of a Quantum Critical Itinerant Ferromagnet: a Monte Carlo Study

Yuzhi Liu, Weilun Jiang, Avraham Klein, Yuxuan Wang, Kai Sun, Andrey Chubukov, Zi Yang, Meng

 

Specific Heat and the Gap Structure of a Nematic Superconductor, Application to FeSe

Kazi Ranjibul Islam, Jakob Böker, Ilya Eremin, Andrey Chubukov

 

Dynamical Vortices in Electron-Phonon Superconductors

Morten Christensen, Andrey Chubukov

 

Interplay between Superconductivity and non-Fermi-Liquid at a Quantum-Critical Point in a Metal. VI. The γ Model and its Phase Diagram at 2<γ<3

Shang-Shun Zhang, Yi-Ming Wu, Artem Abanov, Andrey Chubukov

 

SU(4) Symmetry in Twisted Bilayer Graphene - An Itinerant Perspective

Dmitry Chichinadze, Laura Classen, Yuxuan Wang, Andrey Chubukov

 

Bringing Yang-Mills Theory Closer to Quasiclassics

Mikhail Shifman

Phys. Rev. D 104, 045002 (2021)

Treating Divergent Perturbation Theory: Lessons from Exactly Solvable 2D Models at Large N

Daniel Schubring, Chao-Hsiang Sheu, Mikhail Shifman

 

Yang-Mills at Strong vs. Weak Coupling: Renormalons, OPE And All That

Mikhail Shifman