Quantum Matter

Welcome to the web page of the Quantum Matter research group. We are mainly interested in emergent collective phenomena occurring in many-body quantum systems. We are based at Karlstad University in Sweden.  Our research is funded by Swedish Research Council, STINT and Nordita.

News:

Apr 2024: Upcoming  workshop on Effective Field Theory Beyond Ordinary Symmetries will be held in Daejeon, Korea in December 2024, more information can be found here.

Feb 2024: Seminar on superfluid vortex crystals and their quantum melting at UK Quantum Fluid seminars

Feb 2024: Our paper with Umberto Borla and Snir Gazit on exotic criticality in Ising gauge theory entangled with fermions is posted here.

Jan 2024: Visiting Subhro and Ankush at ICTS in Bangalore.

Oct 2023: Our paper with Dung Nguyen on quantum melting of superfluid vortex crystals is posted here.

Sep 2023: Our virtual condensed matter seminar series expands to the UK! More information can be found here.

Aug 2023: Juliane Graf starts her PhD in our group in Karlstad. 

June 2023: Our paper with Urban Seifert on the Jordan-Wigner mapping between Wegener's and Kitaev's formulations of the Ising gauge theory and its application to anisotropic confinement is posted here.

Dec 2022: Our paper with Yi-Hsien Du, Dung Nguyen and Dam Son on noncommutative field theory of the Tkachenko mode in superfluid vortex crystals is posted here.

Dec 2022: Umberto Borla defends with distinction his PhD thesis "Quantum phases of low-dimensional Z2 lattice gauge theories". Congratulations!

Nov 2022: Our paper with Ruben Verresen, Umberto Borla, Ashvin Vishwanath and Ryan Thorngren on Higgs condensates as symmetry-protected topological phases is posted here.

Nov 2022: Our paper with Patrick Emonts, Ariel Kelman,  Umberto Borla, Snir Gazit and Erez Zohar on application of 2d fermionic tensor networks to the Ising gauge theory is posted here.

Sep 2022: Another year of the Nordic virtual condensed matter seminar series has just started. More information can be found here.

June 2022: Our paper with Matjaz Kerbič, Umberto Borla, Ulrich Schollwöck, Luca Barbiero and Fabian Grusdt on confinement induced frustration is posted here.

May 2022: Munich workshop "Discrete Lattice Gauge Theories - Emergence and Quantum Simulations" is under way, see here.

Feb 2022: Our paper with Bhilahari Jeevanesan and Claudio Benzoni on surface waves in superfluid vortex crystals is posted here and published here.

Feb 2022: Sergej Moroz becomes Nordita Corresponding Fellow. Looking forward to frequent trips to Stockholm!

Dec 2021: Claudio Benzoni defends his PhD thesis "Crystals of Topological Solitons: an Effective Field Theory Approach". Congratulations!

Dec 2021: Together with Mari-Carmen Banuls, Snir Gazit and Erez Zohar we organize a workshop "Discrete lattice gauge theories- emergence and quantum simulations" in Munich in May 2022. We are grateful to MCQST for supporting us!

Nov 2021: Our paper with Aritra Das and Umberto Borla on fractionalized holes in one-dimensional Z2 gauge theory coupled to fermion matter is posted here.

Nov 2021: Our paper with Filip Marijanovic and Bhilahari Jeevanesan on Rayleigh waves and cyclotron surface modes of gyroscopic metamaterials is posted here.

Sep 2021: Together with Habib Rostami (Nordita) and Johannes Hofmann (GU) we start a Nordic virtual condensed matter seminar series. More information can be found here.

Sep 2021: Doesik Kim defends his Master thesis. Congratulations!

Aug 2021: Our paper with Alvise Bastelliano and Umberto Borla on fragmentation and emergent integrable transport in the weakly-tilted Ising chain is posted here and published in PRL.

May 2021: Aritra Das and Filip Marijanovic will do summer projects in our group.

Dec 2020: Our paper with Umberto Borla, Bhilahari Jeevanesan and Frank Pollmann on the two-dimensional Wegner's Z2 gauged theory coupled to spinless fermion matter is posted here and published in PRB as Editors' Suggestion.

Oct 2020: Our paper with Umberto Borla, Ruben Verresen and Jeet Shah on gauging the Kitaev chain is posted here and published in SciPost.

May 2020: Our paper with Dung Nguyen and Andrey Gromov on the fracton-elasticity duality of superfluid vortex matter is posted here and published in SciPost.

Apr 2020: Our paper with Claudio Benzoni and Bhilahari Jeevanesan on Rayleigh edge waves in chiral two-dimensional solids is posted here. The supplementary video is here.

Apr 2020: Our paper with Felix Rose and Omri Golan on the Hall viscosity and conductivity of chiral two-dimensional superconductors is posted here and published in SciPost. 

Nov 2019: Luisa Eck joins our group.

Nov 2019: Daesik Kim joins our group as a Master student.

Oct 2019: Teaching  "Many-Body Quantum Physics" is under way.

Oct 2019: Our paper with Bhilahari Jeevanesan on thermodynamics of two-dimensional bosons in the lowest Landau level  is posted here and published in PRR. The supplementary video is here. 

Sep 2019: Our paper with Umberto Borla, Ruben Verresen and Fabian Grusdt on confined phases of one-dimensional fermions coupled to the Z2 gauge theory  is posted here and published in PRL. 

Sep 2019: Munich workshop "Many-body physics with ultracold atoms and beyond" is under way, see here.

May 2019: Nordita program "Effective theories of quantum phases of matter" is under way, see here.

Feb 2019: Our paper with Omri Golan and Carlos Hoyos on relation between the boundary chiral central charge and bulk Hall viscosity in chiral superfluids is posted here and published in PRB. 

Jan 2019: Our paper with Dam Son on bosonic superfluid on the lowest Landau level is posted here and published in PRB. 

Sep 2018: Registration to the Nordita program "Effective theories of quantum phases of matter" is open.

July 2018: Our paper with Pavel Volkov on Coulomb-induced instabilities of nodal surfaces is posted here and published in PRB.

July 2018: Bhilahari Jeevanesan joins the group as a postdoc.

June 2018: Our paper with Tomas Brauner on a new helical texture in two-dimensional superfluid Helium is posted here and published in PRB.

March 2018: Our paper with Carlos Hoyos, Claudio Benzoni and Dam Son on effective theory of a vortex lattice in bosonic superfluids is posted here and published in SciPost.

Feb 2018: Together with Tomas Brauner, Carlos Hoyos and Dam Thanh Son we are going to organize a month-long interdisciplinary program "Effective theories of quantum phases of matter" to be held in Stockholm in 2019. We are grateful to Nordita for hospitality.

Jan 2018: Our paper with Eduardo Marino, Daniel Niemeyer, Van Sergio Alves and Hans Hansson on effective theory of thin superconducting films is posted here and published in NJP.

Nov 2017: Our introductory article on boson-vortex duality appeared in "De Physicus".

Oct 2017: Oguz Turker defends his Master thesis on Weyl nodal surfaces. Congratulations!

Oct 2017: Umberto Borla joins the group as a PhD student.

Sep 2017: A new paper with Oguz Turker on Weyl nodal surfaces is posted here and published in PRB.

Aug 2017: Our paper with Abhinav Prem, Victor Gurarie and Leo Radzihovsky on multiply quantized vortices is published in PRL.

Jul 2017: Our Erratum with Carlos Hoyos and Leo Radzihovsky on edge physics of quantum Hall fluids is published in PRB.

Jan 2017: Our paper with Abhinav Prem, Victor Gurarie and Leo Radzihovsky on topological order in superconductors is published in PRB as Editors' Suggestion.

Dec 2016: Claudio Benzoni joins our group as a PhD student.

Oct 2016: Oguz Turker joins our group as a Master student.

Sep 2016: Teaching a graduate course Field Theory in Condensed Matter Physics in winter semester 16/17.