Department of Applied Physics

Quantum Dynamics (QD)

The research interests of the QD group lead by Professor Päivi Törmä are quantum coherent dynamics and quantum many-body phenomena in designed nanosystems. We are active in the fields of superconductivity, ultracold quantum gases and nanoplasmonics, and we combine theory and experiment.
Plasmon BEC

Research

The goal of the Quantum Dynamics group is to find novel quantum phenomena that may occur in future designed nanosystems. We target generic concepts, but a few areas where the possibilities of designing and tailoring the systems are particularly fascinating are our focus: 2D materials, ultracold quantum gases and plasmonic lattice systems. In the last one we combine experiment and theory, while in the former two our research is theoretical. The phenomena we have been interested in include superfluidity, superconductivity, topological phases of matter, Bose-Einstein condensation, lasing, and strong coupling between light and matter in the nanoscale.

We have found that exotic forms of superfluidity, such as the co-existence of superconductivity and magnetization, are especially stable in lattice geometries. Also, we have discovered that superfluidity in a flat energy band is connected to the quantum metric and has a lower bound given by a topological invariant, the Chern number.

The Quantum Dynamics group has experimentally observed strong coupling between dye molecules and plasmonic light modes. Arrays of metal nanoparticles offer us great opportunities for designing the band structure and the modes of light. We have observed Bose-Einstein condensation in such a plasmonic lattice, and also dark-mode lasing.

We fabricate plasmonic lattices using nanolithography and measure their optical properties in our lab, which includes a femtosecond laser setup for studies of quantum dynamics.

In the theory work, we use both analytical approaches and advanced numerical methods, such as dynamical mean field theory.

You can find below some of our publications, however click here for a full list of our Latest Publications. You can also find below Media coverage which includes public-accessible descriptions of our work and Alumni showing where people from our group have proceeded.

Latest publications

Excitation Spectrum and Superfluid Gap of an Ultracold Fermi Gas

Hauke Biss, Lennart Sobirey, Niclas Luick, Markus Bohlen, Jami J. Kinnunen, Georg M. Bruun, Thomas Lompe, Henning Moritz 2022 Physical Review Letters

Magnetic on–off switching of a plasmonic laser

Francisco Freire-Fernández, Javier Cuerda, Konstantinos S. Daskalakis, Sreekanth Perumbilavil, Jani Petri Martikainen, Kristian Arjas, Päivi Törmä, Sebastiaan van Dijken 2022 Nature Photonics

Quasi-BIC mode lasing in a quadrumer plasmonic lattice

Rebecca Heilmann, Grazia Salerno, Javier Cuerda, Tommi K. Hakala, Päivi Törmä 2022 ACS Photonics

Revisiting flat band superconductivity: dependence on minimal quantum metric and band touchings

Kukka-Emilia Huhtinen, Päivi Törmä, Jonah Herzog-Arbeitman, Aaron Chew, B. Andrei Bernevig 2022 arXiv.org

Universal suppression of superfluid weight by disorder independent of quantum geometry and band dispersion

Alexander Lau, Sebastiano Peotta, Dmitry I. Pikulin, Enrico Rossi, Timo Hyart 2022 arXiv.org

Orbital magnetization of Floquet topological systems

Gabriel Topp, Päivi Törmä, Dante M. Kennes, Aditi Mitra 2022 Physical Review B

Superconductivity, superfluidity and quantum geometry in twisted multilayer systems

Päivi Törmä, Sebastiano Peotta, Bogdan A. Bernevig 2022 Nature Reviews Physics

Dynamical Quantum Phase Transitions in Strongly Correlated Two-Dimensional Spin Lattices Following a Quench

Fredrik Brange, Sebastiano Peotta, Christian Flindt, Teemu Ojanen 2022 arXiv.org

Spatial and Temporal Coherence in Strongly Coupled Plasmonic Bose-Einstein Condensates

Antti J. Moilanen, Konstantinos S. Daskalakis, Jani M. Taskinen, Päivi Törmä 2021 Physical Review Letters
More information on our research in the Research database.
Research database

Media coverage

Picture of the Quantum Dynamics group members

Alumni

Degree

Name

Current position

PhD(2021) Antti Moilanen

ETH Zürich

PhD(2020) Marek Nečada

University of Eastern Finland

PhD(2020)

Aleksi Julku Aarhus University

PhD(2020)

Aaro Väkeväinen Microsoft HoloLens

PhD(2018)

Rui Guo

Ajat

PhD(2018)

Tuomas Vanhala

Ludwig Maximilian University of Munich

PhD(2018)

Heikki Rekola

University of Eastern Finland (Tampere University)

PhD(2017)

Anne-Maria Visuri

University of Bonn (University of Geneva)

PhD(2015)

Elmer Doggen

Karlsruhe Institute of Technology (CNRS, University of Toulouse)

PhD(2014)

Miikka Heikkinen

Accenture

PhD(2014)

Anna Korolyuk

Sanoma Oy

PhD(2013)

Antti-Pekka Eskelinen

Murata Electronics

PhD(2011)

Jussi Kajala

3DBear (Tekes, Spinverse)

PhD(2010)

Mikko Leskinen

Biit Oy

PhD(2009)

Marcus Rinkiö

Murata Electronics

PhD(2009)

Tommi Hakala

University of Eastern Finland (Aalto University, Harvard University)

PhD(2009)

Anton Kuzyk

Aalto University (Max Plank Institute for Intelligent Systems, Stuttgart; Technische Universität München)

PhD(2008)

Timo Koponen

Varian Medical Systems

PhD(2006)

Jami Kinnunen

Aalto University (JILA, Boulder)

PhD(2006)

Sampo Tuukkanen

Tampere University

PhD(2005)

Pasi Kivinen

Microsoft HoloLens (Murata Electronics)

PhD(2005)

Anu Huttunen

Nokia Research Center

PhD(2003)

Mirta Rodriguez

IRIS Research / Engineering / Technology (Instituto de Estructura de la Materia, Madrid; ICFO Barcelona; University of Oxford)

Postdoc

Konstantinos Daskalakis University of Turku
Postdoc Pramod Kumar

Dispelix (Aalto University)

Postdoc

Long Liang

Sichuan Normal University (Nordita, Stockholm; Aalto University)

Postdoc

Marek Tylutki

Warsaw University of Technology

Postdoc

Jildou Baarsma

ASML Semiconductors

Postdoc

Arya Dhar

Visseiro Digital Healthcare (Leibniz University, Göethe-Universität Frankfurt)

Postdoc

Mikko Huttunen

Tampere University (University of Ottawa)

Postdoc

Stéphane Derom

Universite de Bourgogne

Postdoc

Shaoyu Yin

Zhejiang University of Technology (ZJUT) (University of Birmingham)

Postdoc

Lei Shi

Fudan University, China

Postdoc

Robert Moerland

Lumicks (TU Delft, The Netherlands)

Postdoc

Dong-Hee Kim

Gwangju Institute of Science and Technology (GIST), Korea

Postdoc

Alexander Itin

Universität Hamburg

Postdoc

Francesco Massel

University of Southeast Norway (University of Jyväskylä, University of Helsinki)

Postdoc

Andreas Johansson

University of Jyväskylä

Postdoc

Reza Bakhtiari

Universität Hamburg (Göethe-Universität Frankfurt)

Postdoc

Lars Melwyn Jensen

University of Copenhagen

Postdoc

Jani Martikainen

Aalto University (Nordic Institute for Theoretical Physics (NORDITA))

Postdoc

Vesa Ruuska

Postdoc

Jarmo Vanhanen

Lemi School

Senior researcher

Jussi Toppari

University of Jyväskylä

MSc(2018)

Miika Mäkelä

SSF - Space Systems Finland

MSc(2018)

Antti Ranni

Lund University

MSc(2013)

Juha Kreula

Boston Consulting (University of Oxford)

MSc(2012)

Joel Lehikoinen

Kaiku Health

MSc(2010)

Olli Nummi

Fortum Nuclear Services

MSc(2009)

Kimmo Laitinen

University of Eastern Finland

MSc(2008)

Ville Kotimäki

JAMK University of Applied Sciences

MSc(2007)

Joni Pasanen

University of Jyväskylä

MSc(2007)

Veikko Linko

Aalto University (Technische Universität München)

MSc(2007)

Marina Timmermans (Zavodchikova)

Imec, Belgium (Aalto University)

MSc(2006)

Heli Lehtivuori

University of Jyväskylä (Tampere University of Technology)

MSc(2006)

Lasse Hirviniemi

 

MSc(2005)

Tomi Paananen

Heinrich Heine University of Düsseldorf

MSc(2005)

Mikko Laitinen

University of Jyväskylä

MSc(2004)

Jukka Elfström

Moventas Wind

MSc(2003)

Esa Tarkiainen

Enermet

MSc(2002)

Arto Javanainen

University of Jyväskylä

MSc(2002)

Ossi Partanen

Nordic Semiconductor

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