Dr Francois Parmentier is recognised for his contribution in research on electronic quantum transport in nanostructures at very low temperatures; in particular on the properties of noise and quantised heat transport in mesoscopic systems.

Dr François D. Parmentier has made several significant contributions in research on electronic quantum transport in nanostructures at very low temperatures. On several occasions, he has probed the physics of the fluctuation of the currents flowing in quantum circuits (the so-called quantum shot noise), developing extremely high precision, ultra-low temperature measurement systems, and granting access to important fundamental information of the dynamics of electron transport in these circuits. These extremely difficult experiments routinely combine dilution refrigerator temperatures, large magnetic fields, ultra-low noise electrical measurements and high frequency (from MHz to THz) signals, using home-made, state-of-the art cryogenic electronics.

François D. Parmentier’s main PhD work in Laboratoire Pierre Aigrain consisted in measuring the high frequency noise generated by a single electron source realized in quantum Hall effect edge channels in GaAs heterostructures. After building a microwave noise measurement setup with record high sensitivity and stability, he was able to demonstrate that under the correct operating conditions, the source allowed emitting on-demand, energy resolved single electrons in a quantum Hall effect edge channel. The results of this work have had a strong impact on the electron quantum optics community, and have allowed F. D. Parmentier to actively contribute to a subsequent experiment where the single electron source is used to send single excitations towards an electronic beam-splitter, in analogy with the seminal Hanbury-Brown and Twiss experiment.

François D. Parmentier had a first post-doctoral fellowship in the group of F. Pierre in Laboratoire de Photonique et de Nanostructures. During this fellowship, he continued working on the physics of quantum Hall effect edge channels, using them as a test-bed system to probe the role of interactions and heat transport in quantum circuits. Among the work realized there during his 3+ years post-doc, F. D. Parmentier constructed a highly sensitive low frequency noise measurement setup, which he used to probe the quantum limits of energy transport in a single electron channel in the quantum Hall effect regime. He performed the first quantitative measurement of the quantum limit of heat carried across a single electronic quantum channel, opening the way to experiments showing control and interferences of heat flows in quantum circuits. F. D. Parmentier also worked extensively on how the transport properties of arbitrary quantum conductors are modified when the conductor is inserted into a circuit, emphasizing the crucial role of electronic interactions in quantum circuits. This first post-doctorate fellowship also gave him the occasion to hone his skills in nanofabrication by fabricating complex devices in semiconductor heterostructures, which have led to several publications in very high impact journals.

F. D. Parmentier’s second post-doctorate fellowship was done in the Nanoelectronics group in Service de Physique de l’Etat Condensé (SPEC) of CEA Saclay, where he worked on various aspects of quantum shot noise in graphene. He took part in the measurement of the shot noise generated by a graphene p-n junction in the quantum Hall regime, revealing mechanisms of energy losses from the edge channel propagating in the junction towards localized states in the bulk. F. D. Parmentier also performed the first measurement of the shot noise response of a quantum conductor made of graphene when it is submitted to radiation in the THz range, bridging the gap between low temperature quantum transport experiments and THz physics.

François D. Parmentier recently started a permanent CNRS researcher position in the same group of SPEC, where he is developing activities on energy transport in ultra-clean graphene at low temperature. He has spent spent several months in late 2015 as a visiting researcher in the recently founded group of A. F. Young in UCSB (USA). The purpose of this visit was to start a hopefully longstanding collaboration between the two groups, as well as to exchange experimental techniques, in particular fabrication techniques for state-of-the-art graphene van-der-Waals heterostructures.

Main publications:

17 publications, including 2 Nature, 1 Science, 1 Nature Physics, 3 Physical Review Letters, 3 Nature Communications, 2 Physical Review B.

Number of citations (excluding self-citations): 454

h-index: 10

Current correlations of an on-demand single-electron emitter (74 citations, equal contributions 1st author)

A. Mahé, F. D. Parmentier, E. Bocquillon, J.-M. Berroir, D.C. Glattli, T. Kontos, B. Plaçais, G. Fève, A. Cavanna, Y. Jin. Physical Review B 82, 201309(R) (2010).

This article describes the main results of the candidate’s Ph.D. work, which consisted in detecting and characterizing the extremely small quantum fluctuations of the current generated in the microwave range by a single electron source. Beyond the experimental tour de force of detecting such minute fluctuations, these results have allowed to gain a better understanding of the dynamics of driven mesoscopic quantum systems.

See also:

F. D. Parmentier, et al., Rev. Sci. Inst. 82, 013904 (2011). (Description of the state-of-the art ultra-high sensitivity, ultra-low temperature microwave noise measurement setup developed during the candidate’s Ph.D. – 9 citations)

F. D. Parmentier, et al,. Phys. Rev. B 85, 165438 (2012). (Theoretical analysis of the results presented above – 55 citations)

Quantum Limit of Heat Flow Across a Single Electronic Channel (39 citations, equal contributions 1st author)

S. Jezouin, F. D. Parmentier, A. Anthore, U. Gennser, A. Cavanna, Y. Jin, F. Pierre. Science 342, 601-604 (2013).

This reports details a work done during the candidate’s first post-doctorate fellowship in Laboratoire de Photonique et de Nanostructures, describing the first quantitative measurement of the quantum limit of heat flow for electronic quantum channels in mesoscopic circuits. This milestone experiment demonstrates the universality of the quantum limit of heat flow in a single quantum channel, which had only been previously measured for bosonic particles.

Strong back-action of a linear circuit on a single electronic quantum channel (18 citations)

F. D. Parmentier, A. Anthore, S. Jezouin, H. le Sueur, U. Gennser, A. Cavanna, D. Mailly, F. Pierre. Nature Physics 7, 935-938 (2011).

This article describes an experiment realized during the candidate’s post-doctoral fellowship in Laboratoire de Photonique et de Nanostructures, investigating the modification of transport properties of a tunable quantum conductor embedded in a high-impedence electronic circuit, which highlight the importance of electron-electron interactions in quantum conductors. This work has allowed gaining a better understanding of the laws governing quantum circuits made of arbitrary quantum conductors.

See also:

S. Jezouin, M. Albert, F. D. Parmentier, et al., Nat. Comms 4, 1802 (2013). (Follow-up experimental and theoretical investigation, emphasizing the similarities between the candidate’s experiments and the theoretical description of one-dimensional interacting electronic systems, or Tomonaga-Luttinger liquids – 23 citations)

Shot noise generated by graphene p-n junctions in the quantum Hall effect regime (3 citations)

N. Kumada, F. D. Parmentier, H. Hibino, D. C. Glattli, P. Roulleau. Nature Communications 6, 8068 (2015).

This article describes the experimental investigation of the current fluctuations generated in a graphene p-n junction in the quantum Hall effect regime, highlighting the presence of energy transport channels between the junction and localized states in the bulk, leading to energy relaxation. Those findings, obtained during the candidate’s second post-doctoral fellowship in Service de Physique de l’Etat Condensé, have led to a fruitful collaboration between the candidate’s group in Service de Physique de l’Etat Condensé and NTT Basic Research Laboratories in Japan.

Photon-Assisted Shot Noise in Graphene in the Terahertz Range (0 citation, corresponding author)

F. D. Parmentier, L. N. Serkovic-Loli, P. Roulleau, and D. C. Glattli. Physical Review Letters 116, 227401 (2016).

This letter describes the first measurement of the quantum shot noise generated by a graphene nanoribbon illuminated by terahertz radiation, realized during the candidate’s second post-doctoral fellowship in Service de Physique de l’Etat Condensé. The obtained results further extend the investigation of quantum transport in nanostructures into the terahertz range.

Other significant publications:

Two-channel Kondo effect and renormalization flow with macroscopic quantum charge states (7 citations)

Z. Iftikhar, S. Jezouin, A. Anthore, U. Gennser, F. D. Parmentier, A. Cavanna, F. Pierre. Nature 526, 233–236 (2015)

Controlling charge quantization with quantum fluctuations (2 citations)

S. Jezouin, Z. Iftikhar, A. Anthore, F. D. Parmentier, U. Gennser, A. Cavanna, A. Ouerghi, I. P. Levkivskyi, E. Idrisov, E. V. Sukhorukov, L. I. Glazman F. Pierre. Nature 536, 58–62 (2016)

Primary thermometry triad at 6 mK in mesoscopic circuits

Z. Iftikhar, A. Anthore, S. Jezouin, F. D. Parmentier, Y. Jin, A. Cavanna, A. Ouerghi, U. Gennser, F. Pierre. Nature Communications 7, 12908 (2016)

These three articles detail experiments probing various fundamental aspects of quantum transport, performed in Laboratoire de Photonique et de Nanostructures, using the same single device that the candidate nanofabricated at the end of his first post-doctoral fellowship. The quality, diversity, and number of publications stemming from this device, as well as the fact that it is still being measured almost three years after its fabrication, are a testament of this device robustness and versatility.

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Dr Francois Parmentier

Dr Francois Parmentier