News

BME Best Publication Prize 2020

Paper from the collaboration between the Quantum Electronics group and the Exotic Quantum Phases group was awarded the Best Publication Prize of the university.

 

Z Scherübl, G Fülöp, CP Moca, J Gramich, A Baumgartner, P Makk, T Elalaily, C Schönenberger, J Nygård, G Zaránd, Sz Csonka
Large spatial extension of the zero-energy Yu-Shiba-Rusinov state in magnetic field

Superconducting switch from a nanowire

Novel gate-tunable superconductor-based circuit element created and studied by the BME Quantum Electronics Research Group. Publication in Nano Letters.

 

Tosson Elalaily, Olivér Kürtössy, Zoltán Scherübl, Martin Berke, Gergö Fülöp, István Endre Lukács, Thomas Kanne, Jesper Nygård, Kenji Watanabe, Takashi Taniguchi, Péter Makk, and Szabolcs Csonka
Gate-Controlled Supercurrent in Epitaxial Al/InAs Nanowires
Nano Letters (2021)
 

Kondo cloud in superconductors

New theory results from BME on the electronic states forming around magnetic impurities in superconductors. Published as Editor's Suggestion in Physical Review Letters, and featured as a Synopsis in APS Physics.

 
Cătălin Paşcu Moca, Ireneusz Weymann, Miklós Antal Werner, and Gergely Zaránd
Kondo Cloud in a Superconductor
Phys. Rev. Lett. 127, 186804 – Published 27 October 2021
https://doi.org/10.1103/PhysRevLett.127.186804
 
 
 

Electromechanics in graphene

How and why does the resistance of a graphene nanostructure change, when placed in a pressure cell?

 

Researchers of the BME Quantum Electronics group, along with colleagues at ETH Zürich, address this question in their recent experiment. Two bilayer graphene flakes are pushed against each other in a twisted fashion, akin to recent breakthrough experiments discovering superconductivity in similar samples. The team measured the resistance of the nanostructure as function of pressure and temperature; this allowed to infer key features of the electronic band structure as well. The results are publised in Nano Letters. 

 

Bálint Szentpéteri, Peter Rickhaus, Folkert K. de Vries, Albin Márffy, Bálint Fülöp, Endre Tóvári, Kenji Watanabe, Takashi Taniguchi, Andor Kormányos, Szabolcs Csonka, and Péter Makk
Tailoring the Band Structure of Twisted Double Bilayer Graphene with Pressure
Nano Lett. 2021, 21, 20, 8777 (2021)
https://doi.org/10.1021/acs.nanolett.1c03066

 

Electric control of an optical diode

Electrically controlled optical diode mechanism in a magnetoelectric crystal was discovered by the BME Complex Magnetic Structures research group. Published in Physical Review Letters.

 

The research group, leading an international collaboration, has studied the optical properties of a magnetoelectric antiferromagnet (Ba2CoGe2O7) in the terahertz frequency range. They found a optical diode effect, also known as non-reciprocal light absorption, meaning that a crystal absorbs the electromagnetic radiation for a given propagation direction but transmits most of the light for the counterpropagating radiation. The BME researchers could control the optical diode effect by electric fields. This study also revealed that tuning the electric field can switch the state of the antiferromagnetic domains of the sample, and this is the mechanism that allows for an electrical control of the optical diode effect. These results might enable the design of light switches in the terahertz domain based on antiferromagnets similar to Ba2CoGe2O7.

 

J. Vít, J. Viirok, L. Peedu, T. Rõõm, U. Nagel, V. Kocsis, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki, P. Balla, K. Penc, J. Romhányi, and S. Bordács
In Situ Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic Ba2CoGe2O7
Phys. Rev. Lett. 127, 157201 (2021)

Control of spin-orbit coupling in graphene

New experiment from BME Quantum Electronics Research Group demonstrates mechanical control of spin-orbit coupling in graphene. In: npj 2D materials and applications. 

 

BME Quantum Electronics Research Group: https://nanoelectronics.physics.bme.hu/Quantum_intro

 

Bálint Fülöp, Albin Márffy, Simon Zihlmann, Martin Gmitra, Endre Tóvári, Bálint Szentpéteri, Máté Kedves, Kenji Watanabe, Takashi Taniguchi, Jaroslav Fabian, Christian Schönenberger, Péter Makk & Szabolcs Csonka 
Boosting proximity spin–orbit coupling in graphene/WSe2 heterostructures via hydrostatic pressure
npj 2D Materials and Applications volume 5, Article number: 82 (2021)
https://doi.org/10.1038/s41699-021-00262-9

 

 

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