Integrated Calendar

Using the chiral induced spin selectivity (CISS) effect we were able to induce local spin impurities on magnetic and superconducting material. Dynamic control of spin impurities was also achieved. The CISS is an electronic phenomenon in which electron transmission through chiral molecules depends on the direction of the electron spin. Thus charge displacement and transmission in chiral molecules generates a spin-polarized electron distribution. This effect; is metastable and may generate local magnetic defect that can be enhanced or removed by electric dipole. Also selective process may organize the molecules adsorption.

In my talk I will show that when chiral molecules are adsorbed on the surface of thin ferromagnetic film, they induce magnetization perpendicular to the surface, without the application of current or external magnetic field. On s wave superconductors that are not magnetic, chiral molecules generate states that are similar to magnetic impurities, as well as change the order parameter of the superconductor.
This metastable breaking of time reversal symmetry enables to:
1. achieve magnetic mapping with nanoscale resolution.
2. develop magnetic materials controlled at the nanoscale.
3. develop chiral gated controlled devices.

Let G be a complex reductive group with Lie algebra g and let V be a G-module. There is a natural
moment mapping : V  V  ! g and we denote 

Let G be a complex reductive group with Lie algebra g and let V be a G-module. There is a natural
moment mapping : V  V  ! g and we denote 

Let G be a complex reductive group with Lie algebra g and let V be a G-module. There is a natural
moment mapping : V  V  ! g and we denote 

Bound exotic systems offer unique opportunities to test our understanding of the tenets of modern physics and determine fundamental constants. By comparing measured transitions between antihydrogen and hydrogen, we can search for CPT violation, which may explain the observed baryon asymmetry in the universe while respecting the stringent bounds on CP violation within the standard model. The comparison of the energy levels of muonium (M) with their clean theoretical prediction searches for new physics in a multitude of scenarios such as Lorentz and CPT violation in the muonic sector, and new bosons coupled to leptons. Such particles are motivated by the persistent discrepancy between the recently remeasured anomalous magnetic moment of the muon and its theoretical prediction, arguably the most promising hint to new physics in decades.
In this talk I will review ongoing work for antihydrogen and M spectroscopy at CERN and PSI, and present our recent measurement of the Lamb-Shift in M, comprising an order of magnitude of improvement upon the state of the art and the first improvement to M energy levels in 20 years. I will conclude by showing that pushing M spectroscopy to its limits could independently determine the muon g-2 with enough accuracy to shed light on the puzzle.

As methods for highly specific and precise manipulations of genetics and neuronal activity become the standard in neuroscience, there is growing demand for behavioral paradigms to evolve as well, beyond the simplified and reductive tests which are commonly used. This is especially evident in social behavior, where standard testing paradigms are typically short, involve only a pair of animals, and take place in stimulus-poor environments. Here, we present a series of studies using the Social Box, an experimental setup developed in our lab to automatically track groups of mice living in an enriched environment over days, and extract dozens of behavioral readouts at the individual, dyadic, and group level. We manipulated neuronal populations expressing the socially-relevant neuropeptides oxytocin (OXT) and urocortin3 (UCN3), and utilized genetic mouse models of human disorders affecting sociability – autism spectrum disorder (ASD) and Williams-Beuren Syndrome (WBS) – to demonstrate the importance of the social context in studying mouse behavior. Repeated optogenetic activation of Oxt+ cells recapitulated the known effect of reducing aggressive behavior in the classical resident-intruder paradigm, but in a group of conspecifics it led to an increase in such behaviors on the second day of activation. In parallel, chemogenetic activation of Oxt+ or Ucn3+ cells, separately or together, increased aggressive behavior in the context of a territorial conflict. Finally, behavior of ASD-like mice was mediated by the group composition, such that single-genotype groups showed greater genotype separation in multi-behavioral space than mixed-genotype groups. These findings emphasize the importance of considering contextual and environmental factors when designing and interpreting behavioral studies, which could affect the translatability of findings from mouse to human.


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Meeting ID: 948 2255 6146
Password: 884034