visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2020-10-15 16:00 
연사  
장소 CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus 

Seminar Invitation (October 15, 2020), 4 PM

 

Speaker: Prof. Gil-Ho Lee (POSTECH)

 

Date: October 15, 2020 (Thursday)

 

Time: 4:00 PM

 

Venue: CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus

 

 

Topic: Graphene-based Josephson junction microwave bolometer

 

Abstract:

 

 

Sensitive microwave detectors are critical instruments in radioastronomy, dark matter axion searches, and superconducting quantum information science. The conventional strategy towards higher-sensitivity bolometry is to nanofabricate an ever-smaller device to augment the thermal response. However, this direction is increasingly more difficult to obtain efficient photon coupling and maintain the material properties in a device with a large surface-to-volume ratio. Here we advance this concept to an ultimately thin bolometric sensor based on monolayer graphene. To utilize its minute electronic specific heat and thermal conductivity, we develop a superconductor-graphene-superconductor (SGS) Josephson junction bolometer embedded in a microwave resonator of resonance frequency 7.9 GHz with over 99% coupling efficiency. From the dependence of the Josephson switching current on the operating temperature, charge density, input power, and frequency, we demonstrate a noise equivalent power (NEP) of 7×10-19 W/Hz1/2, corresponding to an energy resolution of one single-photon at 32 GHz and reaching the fundamental limit imposed by the intrinsic thermal fluctuation at 0.19 K.

 

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
254 2022-04-25 16:00    Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)
253 2022-04-28 16:00    (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
252 2022-05-02 16:00    What can we learn from the history of science and technology?(우리말강의)
251 2022-05-09 16:00    Searching for new electronic properties in correlated material flatland
250 2022-05-10 16:00    (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics
249 2022-05-11 16:00    Gravity as a phenomenon in quantum dynamics
248 2022-05-12 16:00    New frontiers of electroweak physics at the LHC
247 2022-05-13 14:30    Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
246 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
245 2022-05-16 16:00    Design synthetic topological matter with atoms and lights
244 2022-05-18 16:00    Geometry, Algebra, and Quantum Field Theory
243 2022-05-19 15:00    (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
242 2022-05-19 15:00    (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
241 2022-05-19 16:00    Chasing Long Standing Neutrino Anomalies with MicroBooNE
240 2022-05-20 11:00    (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals
239 2022-05-23 16:00    Novel electronic transport in topological van der Waals magnets
238 2022-05-25 14:00    Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file
237 2022-05-25 16:00    Uncovering New Lampposts for Dark Matter: Continuum or Conformal
236 2022-05-26 16:00    (광학분야 특별세미나)Topological photonic devices
235 2022-05-27 11:00    Current Status and Future Plans of ADMX file