Date:
Thu, 23/12/2021 - 11:00 to 12:00
Location:
Los Angeles Bld., Jerusalem, Israel
This Thursday, 23.12 at 11.00 am we will have a FH seminar where Prof. Guy Cohen from the Tel Aviv University will give a lecture titled "Resolving the nonequilibrium Kondo singlet in energy- and position-space using quantum measurements". See the details in the file attached.
The Kondo effect, a hallmark of strong correlation physics, is characterized by the formation
of an extended cloud of singlet states around magnetic impurities at low temperatures. While
many implications of the Kondo cloud’s existence have been verified, the existence of the
singlet cloud itself has not been directly demonstrated. We suggest a route for such a
demonstration by considering an observable that has no classical analog, but is still
experimentally measurable:“singlet weights”, or projections onto particular entangled two-
particle states. Using approximate theoretical arguments, we show that it is possible to
construct highly specific energy-and position-resolved probes of Kondo correlations.
Furthermore, we consider a quantum transport setup that can be driven away from
equilibrium by a bias voltage. There, we show that singlet weights are enhanced by voltage
even as the Kondo effect is weakened by it. This exposes a patently nonequilibrium
mechanism for the generation of Kondo-like entanglement that is inherently different from its
equilibrium counterpart.
The Kondo effect, a hallmark of strong correlation physics, is characterized by the formation
of an extended cloud of singlet states around magnetic impurities at low temperatures. While
many implications of the Kondo cloud’s existence have been verified, the existence of the
singlet cloud itself has not been directly demonstrated. We suggest a route for such a
demonstration by considering an observable that has no classical analog, but is still
experimentally measurable:“singlet weights”, or projections onto particular entangled two-
particle states. Using approximate theoretical arguments, we show that it is possible to
construct highly specific energy-and position-resolved probes of Kondo correlations.
Furthermore, we consider a quantum transport setup that can be driven away from
equilibrium by a bias voltage. There, we show that singlet weights are enhanced by voltage
even as the Kondo effect is weakened by it. This exposes a patently nonequilibrium
mechanism for the generation of Kondo-like entanglement that is inherently different from its
equilibrium counterpart.