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Martin Leijnse

Associate Professor, Coordinator of Education within NanoLund

Research:

I am a theoretical condensed matter physicist primarily interested in nanoscale systems. On such small length scales, the physics is drastically different from what we know in our all-day life and is dominated by the laws of quantum mechanics. I investigate different ways of taking advantage of quantum mechanics to design for example electronic components with desirable properties. Specific research topics include:

Superconducting proximity effect and Majorana fermions.

When a superconductor is tunnel coupled to for example a semiconductor, tunneling of Cooper pairs leads to proximity-induced superconductivity in the semiconductor. I am interested in how this can be used to engineer superconductors with new exciting properties, such as topological superconductors hosting so-called Majorana fermion excitations. I am also studying how Majoranas can best be used for quantum information processing. In addition, I investigate how superconductors can be used to mediate a long-distance coupling between other quantum systems, for example spin qubits defined in nanowires.

Quantum transport in nanostructures.

Using primarily quantum master equation approaches, I study nonequilibrium transport in strongly interacting nanostructures, such as quantum dots, nanowires, and single-molecule devices. One goal is to understand how quantum transport can be used to extract spectroscopic information about a nanoscale system. Another goal is to propose devices where a combination of interaction and quantum mechanical effects give rise to some desired functionality, such as spin-polarized currents, negative differential resistance, or rectification.

Heat transport and thermoelectric devices.

The thermoelectric effect allows direct conversion of a heat gradient into an electric current or voltage. I investigate the prospect of using the unique electronic properties of nanoscale devices to make highly efficient thermoelectric energy converters. Thermoelectic efficiency is reduced by losses from heat currents carried by phonons. Therefore, I investigate also phonon transport in nanosctructures, with the goal of designing devices where phonon transport is blocked without destroying the electronic transport properties. 

Research group

  • Rubén Seoane Souto (postdoc): Superconductor-semiconductor hybrid structures and Majorana bound states.
  • Florinda Viñas (PhD student): Electronic and quantum transport properties of heterostructured nanowires.
  • Martin Josefsson (PhD student): Thermoelectrics and quantum thermodynamics in nanoscale systems.
  • Athanasios Tsintzis (PhD student): Quantum dots and quantum rings in heterostructured nanowires.
  • Simon Wozny (MSc student): Two-dimensional topological insulators and impurity scattering.

Co-supervisor for PhD students:

  • Timo Kerremans (main supervisor Peter Samuelsson).
  • Antti Ranni (main supervisor Ville Maisi).

Teaching:

I currently teach the courses Elektroniska material (Electronic materials) and a PhD level course on Theory of superconductivity.

Commissions of trust:

Publications

Retrieved from Lund University's publications database

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Publications

Retrieved from Lund University's publications database

Publications

Retrieved from Lund University's publications database

Page Manager:
Portrait of Martin Leijnse; Photo: Kennet Ruona
E-mail: martin [dot] leijnse [at] ftf [dot] lth [dot] se

Senior lecturer

Solid State Physics

+46 70 357 11 38

+46 70 357 11 38

Professorgatan 1, Lund

14

Senior lecturer

NanoLund

14

Further Information