Spin Dynamics

Quantum spin dynamics are relevant to a wide range of practical applications. We are in particular investigating quantum spin networks, spintronics and magnetic resonance imaging and spectroscopy applications.

    Workshops and Conferences

    • Mini-Workshop on Spintronics and Magnetic Materials
      Tuesday, 8th January 2019, 13:00-17:00, Swansea University, Vivian 9th floor – CTR/SI/Vivian/Rm 918

      [Details]

    Publications

    • E. Jonckheere, S. Schirmer, F. C. Langbein. Effect of Quantum Mechanical Global Phase Factor on Error vs Sensitivity Limitation in Quantum Routing. Accepted, 58th IEEE Conf. Decision and Control (CDC), 2019.

      [Details]

    • JE Evans, G Burwell, FC Langbein, SG Shermer, K Kalna. Dilute Magnetic Contact for a Spin GaN HEMT. Semiconductor and Integrated OptoElectronics Conference (SIOE) Conference, Cardiff, 16-18 April, 2019.

      [Details]

    • S. Schirmer, E. Jonckheere, S. O’Neil, F. C. Langbein. Robustness of energy landscape control for spin networks under decoherence. Proc. IEEE 57th Annual Conference on Decision and Control (CDC), Miami Beach, FL, pp. 6608-6613, 2018.

      [Details]

    • E. Jonckheere, S. Schirmer, F. Langbein. Cover Image – International Journal of Robust and Nonlinear Control 28(6) 2018.

      [Details]

    • Sean O’Neil, Edmond Jonckheere, Sophie Schirmer, Frank Langbein. Sensitivity and Robustness of Quantum Spin-1/2 Rings to Parameter Uncertainty. Proc. IEEE 56th Annual Conference on Decision and Control (CDC), Melbourne, VIC, pp. 6137-6142, 2017.

      [Details]

    • B. Thorpe, K. Kalna, F. C. Langbein, S. G. Schirmer. Spin Recovery in the 25nm Gate Length InGaAs Field Effect Transistor. In: Proc. Int. Workshop on Computational Nanotechnology, pp. 168-169, Windermere, UK, 6-9 June, 2017.

      [Details]

    • E. A. Jonckheere, S. G. Schirmer, F.C. Langbein. Structured Singular Value Analysis for Spintronics network Information Transfer Control. IEEE Trans Automatic Control, 62(12):6568-6574, 2017.

      [Details]

    • E. Jonckheere, S. G. Schirmer, F.C. Langbein. Jonckheere-Terpstra test for nonclassical error versus log-sensitivity relationship of quantum spin network controllers. Int J Robust and Nonlinear Control, 28(6):2383-2403, 2018.

      [Details]

    • B. Thorpe, K. Kalna, F.C. Langbein, S.G. Schirmer. Monte Carlo Simulations of Spin Transport in Nanoscale InGaAs Field Effect Transistors. J Applied Physics, 122, 223903, 2017.

      [Details]

    • S. G. Schirmer, E. Jonckheere, F. C. Langbein. Design of Feedback Control Laws for Information Transfer in Spintronics Networks. IEEE Trans Automatic Control, 63(8):2523-2536, 2018.

      [Details]

    • F. C. Langbein, S. G. Schirmer, E. Jonckheere. Time optimal information transfer in spintronics networks. Proc. IEEE 54th Annual Conference on Decision and Control (CDC), pp. 6454-6459, Osaka, Japan, December 15-18, 2015.

      [Details]

    • E. Jonckheere, F. C. Langbein, S. G. Schirmer. Information Transfer Fidelity in Spin Networks and Ring-based Quantum Routers. Quantum Information Processing, 14(12):4761-4785, 2015.

      [Details]

    • S. G. Schirmer, F. C. Langbein. Characterization and Control of Quantum Spin Chains and Rings. In: Proc. 6th Int Symp Communications, Control and Signal Processing (ISCCSP), pp. 615 – 619, May 2014.

      [Details]

    • E. Jonckheere, F. C. Langbein, S. Schirmer. Quantum networks: Anti-core of spin chains. Quantum Information Processing. 13(7):1607-1637, 2014.

      [Details]

    • E. Jonckheere, F. C. Langbein, S. G. Schirmer. Curvature of quantum rings. In: Proc. 5th Int Symp Communications Control and Signal Processing (ISCCSP), pp. 1-6, 2012.

      [Details]

    • E Jonckheere, S G Schirmer, F C Langbein. Geometry and Curvature of Spin Networks. IEEE International Conference on Control Applicatons, pp. 786-791, 2011.

      [Details]

    Presentations

    • B. Thorpe, F. Langbein, S. Schirmer, K. Kalna. Temperature Affected Non-Equilibrium Spin Transport in Nanoscale In0.3Ga0.7As Transistors. 20th International Workshop on Computational Nanotechnology (IWCN), 20-24th May 20-24, 2019.

      [Details]

    • Frank C Langbein, Sophie G Shermer, Karol Kalna, Jon Evans, Greg Burwell. Dilute Magnetic Semiconductors for Spintronics: Mn:GaN. Cardiff Materials Research Network Conference, 17-18th January, 2019.

      [Details]

    • B. Thorpe, S. Schirmer, K. Kalna, F. C. Langbein. Monte Carlo Simulations of Spin Transport in an InGaAs Field Effect Transistor. 34th International Conference on the Physics of Semiconductors (ICPS2018), Poster P3_176, 29th July to 3rd August 2018.

      [Details]

    • B. Thorpe, Sophie Schirmer, Karol Kalna, Frank Langbein. Monte Carlo simulation of Spin Transport and Recovery in a 25 nm gate length InGaAs Field Effect Transistor. In: European Materials Resdarch Society 2017 Fall Meeting, Symposium F: Spintronics in semiconductors, 2D materials and topological insulators, F.FP.7, 2017.

      [Details]

    • B. Thorpe, K. Kalna, F. C. Langbein, S. G. Schirmer. Spin Recovery in the 25nm Gate Length InGaAs Field Effect Transistor. In: Proc. Int. Workshop on Computational Nanotechnology, pp. 168-169, Windermere, UK, 6-9 June, 2017.

      [Details]

    • Sophie Schirmer, Frank Langbein, Edmond Jonckheere. Control of Quantum Spin Devices, feedback control laws and hidden feedback. Principles and Applications of Control in Quantum Systems, 11th Workshop, PRACQSYS 2017.

      [Details]

    Codes

    Data Sets

      Partners

      Funding

      • September 2018 – August 2020: US-UK International Student Research in Robust Control of Quantum Networks. PI: E Jonckheere (University of Southern California) with SG Schirmer (Swansea University) and FC Langbein (Cardiff University). NSF #1829078 OISE IRES ASI – Track II. USD164,503.

        [Details]

      • June 2015 – August 2015: Pulse Sequence Programming for Magnetic Resonance Imaging using the Earth’s Magnetic Field. PI: F. C. Langbein. CUROP Cardiff Undergraduate Research Opportunities Programme. £1,440.

        [Details]

      • January 2015 – December 2017: Data-Driven Simulation of Quantum Spin Network Devices. PI: F. C. Langbein with S. G. Schirmer (Swansea University), K. Kalna (Swansea University), A. Martinez (Swansea University), D. Burgarth (Aberystwyth University). £120K.

        [Details]

      • August 2014 – August 2015: Cardiff University Research Leave Fellowship. Teaching replacement costs and £3,000 support.

        [Details]

      • August 2012 – July 2015: QUAINT – Optimal Control Technologies in Quantum Information Processing. Coordinator: University of Southampton (I. Kuprov) with Univerzita Karlova v Praze, Czech Republic, Universität Ulm, Germany, Karlsruher Institut fuer Technologie, Germany, Universität des Saarlandes, Germany, Universität Kassel, Germany, Technisch Universität München, Germany, Aarhus Universitet, Denmark, Universite de Bourgogne, France, Centre National de la Recherche Scientifique, France, The Hebrew University of Jerusalem, Israel, Weizmann Institute of Science, Israel, The University of Nottingham, UK, Cardiff University, UK, Swansea University, UK. FP7-ICT-2011-C, ICT-2011.9.1 – Challenging current Thinking, CSA – Coordination & support action, ref 297861. EUR 399,901.

        [Details]