Laboratoire: MPQ (Matériaux et Phénomènes Quantiques), Université Paris Cité & CNRS
Adresse: Bâtiment Condorcet – 10 Rue A. Domon et L. Duquet – 75013 Paris
Directeur de stage/thèse: Amandine Bellec
Tel: 0157276290
e-mail: amandine.bellec@u-paris.fr
Scientific project:
Chiral molecules are present in the form of two non-superimposable enantiomers due to the absence of inversion center (figure 1). They then offer the unique possibility of being able to create spin selectivity at the interface with a metal. This effect, known as the CISS (chiral induced spin-selectivity) effect, was demonstrated in the early 2000s on monolayers of lysine molecules, long carbon chains, adsorbed on Au [1]. But, the origin of this effect is still widely debated [2]. Experimentally, the CISS effect brings together all the phenomena for which the chirality of molecular species influences the spin selectivity of various electronic processes, whether for transmitted electrons [3,4], for transport measurements [5] or even during chemical reactions. To illustrate this last point, studies have been able to demonstrate enantio-selectivity during the adsorption of chiral molecules on magnetic substrates: depending on the orientation of the magnetization, an enantiomer is preferentially adsorbed [6].
In this context, the internship will focus on the interfaces between chiral molecules and metallic or ferromagnetic substrates in order to understand their properties. For this, measurements by scanning tunneling microscopy (STM) will be carried out. For the structural properties, it will be important to understand how chiral molecules adsorb on different metallic substrates. Furthermore, tunneling spectroscopy will provide access to the electronic properties of molecules and it will then be interesting to understand how the CISS effect translates into transport through molecular orbitals, before testing the spin selectivity.
[1] Ray et al., Science 283, 814-816 (1999).
[2] Evers el al., Advanced Materials, 2106629 (2022).
[3] Göhler et al., Science 331, 894-897 (2011).
[4] Kettner et al., The Journal of Physical Chemistry Letters 9, 2025-2030 (2018).
[5] Rodríguez et al., J. Am. Chem. Soc. 144, 24 (2022).
[6] Banerjee-Ghosh et al., Science 360, 1331-1334 (2018).
Methods and techniques: Scanning tunneling microscopy
Possibility to go on with a PhD: YES
Envisaged fellowship: Doctoral School
Figure 1 : Scheme of [6]-helicene molecules
À lire aussi
On-chip generation of spatial entanglement
The QITE team just published in Phys. Rev. Lett. its work on the generation of spatial entanglement in nonlinear waveguide arrays, in collaboration with C2N and INPHYNI. Combining the generation and manipulation of complex quantum states of light on a single chip is a...
An hybrid III-V / Silicon source of photon pairs
The QITE team of MPQ lab, in collaboration with C2N lab, INPHYNI and STMicroelectronics, has just published its work on the development of integrated hybrid sources of entangled photons in PRX Quantum. Combining the generation and manipulation of quantum states of...
Emergent quantum phase transition in superconducting circuits
The THEORIE team has recently published a significant theoretical study in Nature Communications on the topic of quantum critical phenomena. This research addresses a current debate that questions the traditional understanding of dissipative quantum phase transitions...
Probing and manipulating the superconducting state of NbSe2 in the 2D limit
Context:. The dynamics of superconductors (SC) driven out-of-equilibrium is governed by their collective mode spectrum, and in particular the SC amplitude mode which is an analog of the Higgs mode in high-energy physics [1]. In many materials the coexistence of SC...