Research

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.

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.

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 Al_xGa_1−xAs/Al_0.24Ga_0.76As 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)

High Energy Theory & Particle Astrophysics

Condensed Matter Theory

Recent Publications