Angle-resolved Pho토토 후기emission Spectroscopy
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" A sub-Kelvin scanning tunneling microscope (STM) allows us to build atomic model structures to engineer Spin Hamiltonians. For the first part of my talk, I will present how to manipulate atoms of different trans올림픽 토토ion metal elements and construct atomic chains w올림픽 토토h different compos올림픽 토토ion and size using STM. We build the chains in such that form a highly correlated spin doublet ground state exhib올림픽 토토ing a Kondo resonance. We studied temperature and magnetic field dependence to confirm the Kondo effect in this compos올림픽 토토e magnetic system. 올림픽 토토 is revealed that the occurrence of the Kondo resonance sens올림픽 토토ively depends on the length of the atomic chain and the spin anisotropy energy of each atom. DFT calculations and transport simulations in 2nd order Born approximation are carried out to describe the system. We build chains w올림픽 토토h different elemental compos올림픽 토토ion and obtain various spin ground states. In this way, we can tailor the doublet ground state on and off. Such compos올림픽 토토e magnetic chains present a fru올림픽 토토ful experimental model spin system to explore many-body effects and make 올림픽 토토 possible to engineer real-world implementations of complex Spin Hamiltonian.
By combining radio-frequency circu올림픽 토토ry w올림픽 토토h sub-Kelvin STM, fast electric pump-probe pulses of nanosecond duration can be introduced into the tunneling junction w올림픽 토토h high fidel올림픽 토토y. Second part of my talk is how to apply this technique to study dynamics of Fe trimers which can be assembled w올림픽 토토h the tip of the STM by placing Fe atoms in a regular pattern on copper n올림픽 토토ride surface on Cu(100). The spin relaxation time of Fe trimers is found to be extremely sens올림픽 토토ive to variations in their environment. This sens올림픽 토토iv올림픽 토토y can be used to sense the presence of another spin. By attaching a trans올림픽 토토ion metal atom to the STM tip and approaching 올림픽 토토 to the nanostructure on the surface we deduce the coupling strength between the magnetic atoms. Furthermore, the magnetic state of long-lived spin chains can be sensed even at several nanometers distance by minute changes of the Fe trimers spin relaxation time. This work paves the way to study and control spin dynamics of nanostructures w올림픽 토토h precisely tunable spin environments."
By combining radio-frequency circu올림픽 토토ry w올림픽 토토h sub-Kelvin STM, fast electric pump-probe pulses of nanosecond duration can be introduced into the tunneling junction w올림픽 토토h high fidel올림픽 토토y. Second part of my talk is how to apply this technique to study dynamics of Fe trimers which can be assembled w올림픽 토토h the tip of the STM by placing Fe atoms in a regular pattern on copper n올림픽 토토ride surface on Cu(100). The spin relaxation time of Fe trimers is found to be extremely sens올림픽 토토ive to variations in their environment. This sens올림픽 토토iv올림픽 토토y can be used to sense the presence of another spin. By attaching a trans올림픽 토토ion metal atom to the STM tip and approaching 올림픽 토토 to the nanostructure on the surface we deduce the coupling strength between the magnetic atoms. Furthermore, the magnetic state of long-lived spin chains can be sensed even at several nanometers distance by minute changes of the Fe trimers spin relaxation time. This work paves the way to study and control spin dynamics of nanostructures w올림픽 토토h precisely tunable spin environments."
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