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)
266 2017-09-26 11:00    Time-resolved ARPES study of Dirac and topological materials
265 2019-11-01 14:30    Squeezing the best out of 2D materials file
264 2019-04-19 14:30    A family of finite-temperature electronic phase transitions in graphene multilayers file
263 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
262 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
261 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
260 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
259 2016-05-13 13:30    Aperiodic crystals in low dimensions
258 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
257 2025-07-03 14:00  Dr. Young-Gwan Choi (Max Planck Institute )  Quantum sensing with NV centers: nanoscale magnetometry file
256 2017-05-12 13:30    Topological Dirac insulator
255 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
254 2022-06-10 11:00    Record-quality two-dimensional electron systems file
253 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
252 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
251 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
250 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
249 2023-12-14 16:00    Superconducting qubits for large-scale quantum computers file
248 2023-04-13 11:00    [High Energy Theory Seminar]Noninvertible Gauss Law and Axions
247 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence file