Nanophotonic Quantum Materials and Responses

Max Planck Quantum Matter Seminar

  • Date: Dec 2, 2021
  • Time: 10:00 - 11:00
  • Speaker: Justin Song
  • NTU Singapore
  • Location: online via Zoom
  • Host: James McIver
Nanophotonic Quantum Materials and Responses
Quantum material phases and responses are often locked to its particular crystal structure and atomic registration. In this talk, I will argue that by exploiting nanophotonic techniques that can shape and compress electro-magnetic (EM) fields, new "nanophotonic" phases of matter and unconventional responses can be realised.

I will discuss two examples of such new phenomena. A. Plasmonic symmetry breaking: I will discuss how strong internal ac fields that arise when graphene is driven close to its plasmon resonance gives rise to a spontaneous generation of a self-induced Bloch band Berry flux (Berryogenesis). This supports and is sustained by a circulating plasmonic motion, even for a linear polarized driving field. This non-equilibrium phase transition occurs above a critical driving amplitude and can enter a spontaneously non-equilibrium (plasmon-mediated) magnetized state in either. B. Realising “time reversal forbidden” bulk photocurrents even in a non-magnetic and centrosymmetric material by exploiting non-vertical transitions. I will discuss how a range of bulk photocurrents can be activated by non-vertical transitions and highlight their unusual phenomenology such as a “Fermi surface resonance” effect enabling to achieve large bulk photocurrents even in a symmetric bulk.
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