visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Search for dark matter axion with Rydberg atoms

2021.03.19 17:37

admin 조회 수:6327

날짜 2021-03-25 16:00 
연사  
장소 Online Seminar (Zoom) 

Topic: Search for dark matter axion with Rydberg atoms

 

Speaker: Prof. Atsushi Tokiyasu


Date: March 25, 2021 (Thursday)
Time: 4:00 PM

 

Venue: Online Seminar (Zoom Teleconference System)
 
https://kaist.zoom.us/j/6108068959?pwd=TXV2OGlWdVRtcGhmNXVTRWlla2pHQT09

Meeting ID: 610 806 8959

Passcode: 131015
     

Abstract:     

 

Axion is a hypothetical particle, originally proposed to solve the Strong CP problem in the QCD theory. Axion is believed to be generated in the early universe, and it is known to be one of the candidates of cosmic dark matter.

Many search experiments were performed, but the existence of axion has not been established yet.

From the recent observation on the cosmic microwave and the theoretical calculation, it is suggested that the
axion has a mass of O(100) micro-eV. We are aiming to search for axion in this mass region (New-CARRACK
project).
In the New-CARRACK project, we are planning to search for axion by using a single photon detection method.
Single photon detection is free from the standard quantum limit, and allows us to search for axion with a wide
range of mass without degrading its detection sensitivity.
If the mass of axion is O(100) micro-eV, the converted photon with strong magnetic field have the frequency of O
(10) GHz. It is difficult to detect this photon with a micro-wave cavity, and we will use a Rydberg atom, which is an excited atom that have electrons with high principal quantum number (n~100).
Rydberg atom is known to be sensitive to micro-wave photons. By changing the excited level with the laser
system, we can control the sensitive frequency. In addition, we can search for axion in the wide mass range by
using direct photo-ionization processes.
 
We are now constructing a detector system which consists of superconducting magnet, a dilution refrigerator and high-precision laser system to excite a Rydberg atom.We have also found a new method to improve S/N of axion search which utilize
a cooled and bunched beam of Rydberg atoms.
 

 

In this seminar, the recent results of axion search experiments are reviewed. The overview of New-CARRACK project are
introduced, and the preparation status will be reported.
Poster_Tokiyasu (Revised).jpg

 

introduced, and the preparation status will be reported.

 

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)
565 2020-10-16 14:30    Nanoscale magnetic resonance detection towards nano MRI file
564 2015-12-02 16:00    Samarium Hexaboride: Is it a Topological insulator?
563 2020-10-16 16:00    Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
562 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
561 2016-05-16 16:00    Tuning microwave cavities with biased nonlinear dielectrics for axion searches
560 2018-10-12 14:30    Quantum Advantage in Learning Parity with Noise file
559 2023-04-04 16:00    Chiral Magnetism: A Geometric Perspective
558 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
557 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
556 2018-09-05 16:00    Shining a light on fractional excitations file
555 2022-03-18 11:00    (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
554 2021-03-02 16:00    Sensitive terahertz detection with graphene-based transistors file
553 2020-11-20 16:00    Coherent control of field gradient induced quantum dot spin qubits
552 2016-11-04 15:00    Quantum information experiments using few electron spins in semiconductors
551 2022-01-17 14:00    Five Lectures on Observational Probes of Dark Energy file
550 2018-11-09 16:00    Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
549 2022-11-18 16:00    Qubits, new experimental tools for physics file
548 2020-11-20 14:30    Lumpy Cooper pairs in an iron-based superconductor
547 2017-07-10 16:00    “Intertwined Orders in a Heavy-fermion metal” file
546 2022-05-25 14:00    Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file