Quantum Nanoelectronics Seminars

All the "Quantum Nanoelectronics Seminars" past and future in this section.

The previous seminar was held on :
Tuesday 3 april 2018 at 2pm, room « Remy Lemaire » (K223), Institut Néel
Mandatory registration

Quantum dot physics in Majorana nanowires
Ramon Aguado (Consejo Superior de Investigaciones Científicas, Spain)

An interacting quantum dot coupled to a superconducting contact is an artificial analogue of a quantum impurity in a superconductor. The physics of such hybrid device is governed by the fermionic parity and spin of the two possible ground states, doublet or singlet (and their corresponding Shiba sub-gap excitations). After an introduction on the physics of Shiba excitations in quantum dots coupled to superconductors [1,2], I will explain what happens when this paradigmatic model is generalised to the case where the superconductor becomes topological. Such a quantum dot-topological superconductor junction can be experimentally realised by e. g. creating quantum dots at the end of epitaxial hybrid semiconductor-superconductor nanowires. As I will argue, the hybridisation between Shiba states in the dot and Majoranas in the nanowire show specific and measurable spectral features that arise from the interplay of these states. Interestingly, these features are enough to fully characterise the spin structure of the Majorana wavefunction, the degree of Majorana non-locality and the Majorana splitting. Thus, quantum dots used to perform spectroscopy of a Majorana nanowire are a powerful probe into the quantum structure of Majorana bound states [3,4] and constitute an interesting alternative to other techniques for Majorana detection.

[1] Eduardo J. H. Lee, Xiaocheng Jiang, Manuel Houzet, Ramon Aguado, Charles M. Lieber and Silvano De Franceschi, Nature Nanotech., 9, 79-84 (2014)
[2] Eduardo J. H. Lee, Xiaocheng Jiang, Rok Zitko, Ramon Aguado, Charles M. Lieber and Silvano De Franceschi, Phys. Rev. B 95, 180502 (2017)
[3] E. Prada, R. Aguado and P. San Jose, Phys. Rev. B 96, 085418 (2017)
[4] M. T. Deng, S. Vaitiekénas, E. Prada, P. San-Jose, J. Nygård, P. Krogstrup, R. Aguado, C. M. Marcus, arXiv:1712.03536

Contact : Ramon Aguado

The organization committee,
M. Hocevar, B. Sacepe, R. Whitney, C. Groth

If you want to plan invitations, please contact us at the following address :

15 May 2018
Richard deBlock (LPS Orsay)



19 December 2017
Tailoring supercurrent confinement in graphene bilayer weak links by Romain Danneau (Karlsruhe Institute of Technology Germany)
4 December 2017
Photonic counterparts of Cooper pairs by Marcelo Franca Santos (Universidade Federal do Rio de Janeiro)
28 November 2017
Near-quantum-limited microwave amplification and nonreciprocal transmission using engineered mechanical dissipation by Alexey Feofanov (EPFL Lausanne)
14 November 2017
Electron Transfer between Quantum Dots by Tobias Krähenmann (ETH Zurich)
7 November 2017
The Josephson effect in semiconductor channels : From fundamental science to qubit applications by Attila Geresdi (QuTech & Kavli Institute of Nanoscience, Delft University of Technology)
17 October 2017
Superconducting microwave cavities as memories for modular quantum information processing by Wolfgang Pfaff (Yale University, USA)
10 October 2017
From single magnetic adatoms on superconductors to coupled spin chains
by Katharina Franke (Freie Universität Berlin)

26 September 2017
Revealing a quantum phase transition with a Kondo circuit by Zubair Iftikhar (SPEC, CEA)
19 September 2017
Tinkering with Majoranas by Anton Akhmerov (TU Delft)
11 July 2017
The role of electron-electron interactions in graphene by Shaffique Adam (National University of Singapore)
20 June 2017
Charge quantum interference device on superconducting nano-wiresby by Oleg Astafiev (Royal Holloway, University of London)
13 June 2017
Evolving functionality in nanomaterial networks by Wilfred G. van der Wiel (University of Twente, The Netherlands)
6 June 2017
Relaxation of an Electron Spin in a Moving Quantum Dotby Xuedong Hu (Department of Physics, University at Buffalo, USA)
30 May 2017
Understanding and exploiting interactions between components in quantum circuits by Philippe Joyez (SPEC, CEA-Saclay)
22 May 2017
Feedback-tuned high fidelity gates for (GaAs based) two-electron spin qubits by Hendrik Bluhm (RWTH Aachen University, Germany)
16 May 2017
Electron teleportation in multi-terminal Majorana islands : Kondo effect at high temperature by Karen Michaeli (Weizmann Institute for Science, Israel)
9 May 2017
Superconducting Atom Chips by Rainer Dumke (Nanyang Technological University, Singapore)
4 May 2017
Quantum Physics in One Dimension using Nanostructured Josephson-junction Arrays by Tim Duty (University of New South Wales, Sydney)
20 April 2017
Les bits quantiques MOS by Prof. Michel Pioro-Ladrière (Professeur associé, Département de physique, Université de Sherbrooke et Directeur adjoint, Institut Quantique, Université de Sherbrooke)
11 April 2017
Quantum microwave devices based on inelastic Cooper pair tunneling by Max Hofheinz (CEA INAC)
28 March 2017
Spin to charge conversion at room temperature using spin orbit coupling and recently discovered topological insulators by Laurent Vila (SPINTEC)
21 March 2017
Spin Dynamics in Out-of-Equilibrium Superconductors by Charis Quay (Laboratoires de Physique des Solides, Université Paris Sud)
14 March 2017
From CMOS transistors to CMOS spin qubits by Marc Sanquer (INAC/PHELIQS/LATEQS CEA & UGA)
14 February 2017
Quantized circular photogalvanic effect in Weyl semimetals by Adolfo Grushin (Department of Physics, UC Berkeley et Institut Néel, CNRS & UGA)
7 February 2017
Confining the state of light to a quantum manifold by engineered two-photon loss by Zaki Leghtas (Laboratoire Pierre Aigrain - Ecole Normale Supérieure)
31 January 2017
Many-Body Localization Basics - Recent Highlights - Experimental possibilities by Nicolas Laflorencie (Laboratoire de Physique Théorique, Toulouse)
24 January 2017
Fluctuation theorems in engineered environments by Marcelo F. Santos (Universidade Federal do Rio de Janeiro, Brazil)
17 January 2017
THz Spectroscopy on Disordered Superconductors and the “Superconducting Dome” of Granular Aluminum by Marc Scheffler (Physikalisches Institut, University of Stuttgart, Germany)
10 January 2017
Mesoscopic Spectroscopy with Josephson Junctions by Caglar GIRIT (Collège de France, Paris)



Quantum Nanoelectronics Seminar : Richard deBlock

mardi 15 mai 2018 - 14h00 - Room « Remy Lemaire » (K223)

Richard deBlock (LPS Orsay) All the "Quantum (...)

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avril 2018 :

mars 2018 | mai 2018