CME seminar TODAY 11:30-12:30 in SSR

[Jay Gupta]

Condensed Matter Seminar

Dr. Igor Altfeder

(Wright Patterson AFB / LANL)

Scanning Tunneling Microscopy of Electrons, Phonons and Spins in Quantum
Materials



11:30-12:30 in the Smith Seminar Room, Physics Research Building



Scanning tunneling microscopy represents a powerful technique for studies
of quantum interactions at the nanoscale. This presentation will cover
several active research areas (nanophononics, nanoelectronics and
nanomagnetism). The area of nanophononics has been advanced by experimental
discoveries of vacuum phonon tunneling (PRL 2010) and optical phonon
Bose-Einstein condensation (Sci. Rep. 2017). STM experiments on
quasi-freestanding layers of 2D semiconductor revealed room-temperature
optical phonon condensate mediated by phonon scattering and interaction at
resonant defects. The real space Bose-Einstein condensation manifests in
synchronization of phonon phases and formation of collective condensate
phase with unusually large (macroscopic) coherence time. This coherent
state of matter possibly plays an important role in quantum biology. The
experimental study of nanomagnetism can be accomplished using
spin-polarized version of STM. In this part, I will describe spin-polarized
STM observation of atomically narrow magnetic domain boundaries and
few-atom domains in 2D antiferromagnetic layers (PRB 2013). A practical use
of few-atom magnetic domains may allow 100x more dense magnetic memory
storage compared to present day technology. The possible formation
mechanisms of these nanoscale spin structures will also be discussed.
Nanoelectronics and imaging quantum electronic states is a traditional area
of STM advances. In this part of presentation, I will review STM
experiments on quasi-1D transport and high-resolution quantum electron
tomography of thin metal films (PRLs 2012 and earlier). The topics will
include nanoscale engineering invisible for tomography (cloaked) objects,
the examples of super-resolution, and the discussion about quasi-1D many
body physics behind these effects.
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