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UID:69b7f115c1327
DTSTART:20250612T130000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20250612T140000Z
LOCATION:Seminar Room
SUMMARY:ICFO | GUNDA KIPP
CLASS:PUBLIC
DESCRIPTION:Van der Waals (vdW) heterostructures host rich many-body quantu
 m phenomena that are highly tunable via electrostatic gating. Intriguingly
 \, the gates and 2D materials in these structures inherently form&nbsp\;pl
 asmonic self-cavities\, confining light in standing waves of current densi
 ty due to finite-size effects.&nbsp\;The plasmonic resonances of typical g
 raphite gates fall within the GHz-THz range\,&nbsp\;aligning with the &mu\
 ;eV- meV energy scale of the phenomena they electrically control in vdW he
 terostructures. This suggests that the built-in cavity modes of graphite g
 ates may play a significant role in shaping the low-energy physics of vdW 
 heterostructures. However\, probing these cavity-coupled electrodynamics i
 s challenging due to the sub-wavelength scale of the devices relative to t
 he diffraction limit.&nbsp\;\nIn this talk\, I will present our recent res
 ults using advanced&nbsp\;on-chip THz spectroscopy&nbsp\;to probe the intr
 insic cavity conductivity of gate-tunable graphene heterostructures. By tu
 ning the carrier density\, we reveal&nbsp\;ultrastrong coupling&nbsp\;and 
 hybridization between graphene and graphite plasmonic cavity modes\, accom
 panied by significant spectral weight transfer. To interpret these finding
 s\, we introduce an analytical framework and outline design principles for
  future cavity-engineered vdW systems.\nOur study&nbsp\;demonstrates&nbsp\
 ;that intrinsic cavity effects are essential for understanding the low-ene
 rgy electrodynamics of vdW heterostructures and offer new opportunities fo
 r functionality through cavity control.
DTSTAMP:20260316T120125Z
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