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

Pairing by a Dynamical Interaction in a Metal

Andrey Chubukov, Artem Abanov

 

Interplay between superconductivity and non-Fermi liquid at a quantum-critical point in a metal. IV: The γ model and its phase diagram at 1<γ<2

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

 

Interplay between superconductivity and non-Fermi liquid at a quantum-critical point in a metal. III: The γ model and its phase diagram across γ=1

Yi-Ming Wu, Artem Abanov, Andrey Chubukov

Phys. Rev. B 102, 094516 (2020)

Valley magnetism, nematicity, and density wave orders in twisted bilayer graphene

Dmitry Chichinadze, Laura Classen, Andrey Chubukov

Phys. Rev. B 102, 125120 (2020)

Competing orders at higher-order Van Hove points

Laura Classen, Andrey Chubukov, Carsten Honerkamp, Michael Scherer

Phys. Rev. B 102, 125141 (2020)

Interplay between superconductivity and non-Fermi liquid at a quantum critical point in a metal. II. The γ-model at a finite T for 0<γ<1

Yi-Ming Wu, Artem Abanov, Yuxuan Wang, Andrey Chubukov

Phys. Rev. B 102, 024525 (2020)

Quantum Phase Transition in the Yukawa-SYK Model

Yuxuan Wang, Andrey Chubukov

Phys. Rev. Research 2, 033084 (2020)

Interplay between superconductivity and non-Fermi liquid at a quantum-critical point in a metal. I: The γ-model and its phase diagram at T=0. The case 0<γ<1

Artem Abanov, Andrey Chubukov

Phys. Rev. B 102, 024524 (2020)

Thermodynamic signatures of an antiferromagnetic quantum critical point inside a superconducting dome

Vanuildo de Carvalho, Andrey Chubukov, Rafael Fernandes

Phys. Rev. B 102, 045125 (2020)

Eliashberg theory of phonon-mediated superconductivity -- when it is valid and how it breaks down

Andrey Chubukov, Artem Abanov, Ilya Esterlis, Steven Kivelson

Annals of Physics, Vol. 417, June 2020, 168190

Identification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data

Xiao Yan Xu, Avraham Klein, Kai Sun, Andrey Chubukov, Zi Yang Meng

npj Quantum Mater. 5, 65 (2020)

Normal state properties of quantum critical metals at finite temperature

Avraham Klein, Yoni Schattner, Erez Berg, Andrey Chubukov

Phys. Rev. X 10, 031053 (2020)

The pairing glue in cuprate superconductors from the self-energy revealed via machine learning

Andrey Chubukov, Jörg Schmalian

Phys. Rev. B 101, 180510(R) (2020)

Dynamics of ion channels via non-Hermitian quantum mechanics

Tobias Gulden, Alex Kamenev

 

Plasmonic Tuning of the Near Field Heat Transfer in Double Layer Graphene

Xuzhe Ying, Alex Kamenev

Phys. Rev. B 102, 195426 (2020)

Nature of Protected Zero Energy States in Penrose Quasicrystals

Ezra Day-Roberts, Rafael Fernandes, Alex Kamenev

Phys. Rev. B 102, 064210 (2020)

SYK Superconductivity: Quantum Kuramoto and Generalized Richardson Models

Hanteng Wang, Alexander Chudnovskiy, Alexander Gorsky, Alex Kamenev

Phys. Rev. Research 2, 033025 (2020)

Multidimensional dark space and its underlying symmetries: towards dissipation-protected qubits

Raul Santos, Fernando Iemini, Alex Kamenev, Yuval Gefen

 

Inflaton Oscillations and Post-Inflationary Reheating

Marcos Garcia, Kunio Kaneta, Yann Mambrini, Keith Olive

 

The Impact of New d(p,γ)He3 Rates on Big Bang Nucleosynthesis

Tsung-Han Yeh, Keith Olive, Brian Fields

 

Low-Energy Probes of No-Scale SU(5) Super-GUTs

John Ellis, Jason Evans, Natsumi Nagata, Keith Olive, Liliana Velasco-Sevilla

 

Improving Helium Abundance Determinations with Leo P as a Case Study

Erik Aver, Danielle Berg, Keith Olive, Richard Pogge, John Salzer, Evan Skillman

 

Building Models of Inflation in No-Scale Supergravity

John Ellis, Marcos Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith Olive, Sarunas Verner

 

Non-Oscillatory No-Scale Inflation

John Ellis, Dimitri Nanopoulos, Keith Olive, Sarunas Verner

 

θ-dependence of light nuclei and nucleosynthesis

Dean Lee, Ulf-G. Meißner, Keith Olive, Mikhail Shifman, Thomas Vonk

Phys. Rev. Research 2, 033392 (2020)

The case for decaying spin-3/2 dark matter

Marcos Garcia, Yann Mambrini, Keith Olive, Sarunas Verner

Phys. Rev. D 102, 083533 (2020)

Reheating and Post-inflationary Production of Dark Matter

Marcos Garcia, Kunio Kaneta, Yann Mambrini, Keith Olive

Phys. Rev. D 101, 123507 (2020)

Phenomenology and Cosmology of No-Scale Attractor Models of Inflation

John Ellis, Dimitri Nanopoulos, Keith Olive, Sarunas Verner

JCAP 08 (2020) 037

Axion Kinetic Misalignment and Parametric Resonance from Inflation

Raymond Co, Lawrence Hall, Keisuke Harigaya, Keith Olive, Sarunas Verner

JCAP 08 (2020) 036

Proton Decay: Flipped vs Unflipped SU(5)

John Ellis, Marcos Garcia, Natsumi Nagata, Dimitri Nanopoulos, Keith Olive

JHEP 05 (2020) 021

A Model of Metastable EeV Dark Matter

Emilian Dudas, Lucien Heurtier, Yann Mambrini, Keith Olive, Mathias Pierre

Phys. Rev. D 101, 115029 (2020)

Pair production of dark particles in meson decays

Matheus Hostert, Kunio Kaneta, Maxim Pospelov

Phys. Rev. D 102, 055016 (2020)

Dark Higgs Dark Matter

Cristina Mondino, Maxim Pospelov, Joshua Ruderman, Oren Slone

 

The measurement of the quadrupole moment of 185-Re and 187-Re from the hyperfine structure of muonic X rays

A. Antognini et al.

Phys. Rev. C 101, 054313 (2020)

How long does the hydrogen atom live?

David McKeen

 

New Constraints on Millicharged Particles from Cosmic-ray Production

Ryan Plestid, Volodymyr Takhistov, Yu-Dai Tsai, Torsten Bringmann, Alexander Kusenko, Maxim Pospelov

Phys. Rev. D 102, 115032 (2020)

Quark Flavor Phenomenology of the QCD Axion

Jorge Martin Camalich, Maxim Pospelov, Pham Ngoc Hoa Vuong, Robert Ziegler, Jure Zupan

Phys. Rev. D 102, 015023 (2020)

A Precise Photometric Ratio via Laser Excitation of the Sodium Layer I: One-photon Excitation Using 342.78 nm Light

J. Albert, D. Budker, K. Chance, I.E. Gordon, F. Pedreros Bustos, M. Pospelov, S.M. Rochester, H.R. Sadeghpour

 

Cosmological and astrophysical probes of dark baryons

David McKeen, Maxim Pospelov, Nirmal Raj

 

Earth-bound Milli-charge Relics

Maxim Pospelov, Harikrishnan Ramani

 

Novel multi-lepton signatures of dark sectors in light meson decays

Matheus Hostert, Maxim Pospelov

 

The Search for Feebly-Interacting Particles

Gaia Lanfranchi, Maxim Pospelov, Philip Schuster

 

Millicharged Cosmic Rays and Low Recoil Detectors

Roni Harnik, Ryan Plestid, Maxim Pospelov, Harikrishnan Ramani

 

A Precise Photometric Ratio via Laser Excitation of the Sodium Layer II: Two-photon Excitation Using Lasers Detuned from 589.16 nm and 819.71 nm Resonances

J. Albert, D. Budker, K. Chance, I.E. Gordon, F. Pedreros Bustos, M. Pospelov, S.M. Rochester, H.R. Sadeghpour

 

Edges and Endpoints in 21-cm Observations from Resonant Photon Production

Andrea Caputo, Hongwan Liu, Siddharth Mishra-Sharma, Maxim Pospelov, Joshua Ruderman, Alfredo Urbano

 

Constraints on Decaying Sterile Neutrinos from Solar Antineutrinos

Matheus Hostert, Maxim Pospelov

 

Hydrogen portal to exotic radioactivity

David McKeen, Maxim Pospelov, Nirmal Raj

Phys. Rev. Lett. 125, 231803 (2020)

New limits on dark photons from solar emission and keV scale dark matter

Haipeng An, Maxim Pospelov, Josef Pradler, Adam Ritz

Phys. Rev. D 102, 115022 (2020)

Supersymmetric Proximity

Mikhail Shifman

 

Operator Product Expansion and Calculation of the Two-Loop Gell-Mann-Low Function

Mikhail Shifman, Arkady Vainshtein

Sov. J. Nucl. Phys. 44, 321 (1986)

The Beginning of the Nuclear Age

Mikhail Shifman

 

String "Baryon'' in Four-Dimensional N = 2 Supersymmetric QCD from 2D-4D Correspondence

E. Ievlev, M. Shifman, A. Yung

Phys. Rev. D 102, 054026 (2020)

Long Way to Ricci Flatness

Jin Chen, Chao-Hsiang Sheu, Mikhail Shifman, Gianni Tallarita, Alexei Yung

JHEP 10 (2020) 059

Sigma model on a squashed sphere with a Wess-Zumino term

Daniel Schubring, Mikhail Shifman

Phys. Rev. D 103, 025016 (2021)

Musings on the Current Status of HEP

Mikhail Shifman

Mod. Phys. Lett. A 35, 07, 2030003 (2020)

Hidden Quantum Hall Stripes in AlxGa1−xAs/Al0.24Ga0.76As Quantum Wells

X. Fu, Yi Huang, Q. Shi, B. Shklovskii, M. Zudov, G. Gardner, M. Manfra

Phys. Rev. Lett. 125, 236803 (2020)

Spectral rigidity of non-Hermitian symmetric random matrices near Anderson transition

Yi Huang, B. Shklovskii

Phys. Rev. B 102, 064212 (2020)

Isotropically conducting (hidden) quantum Hall stripe phases in a two-dimensional electron gas

Yi Huang, M. Sammon, M. Zudov, B. Shklovskii

Phys. Rev. B 101, 161302 (2020)