This is a seminar jointly organized by the three groups working on quantum physics and technology at Department of Physics, Kindai University, namely Condensed-Matter Theory (CMT), Quantum Control (QC), and QMB Laboratories.
Scheduled talks
Fiscal year 2024
Time and date: 10:45-, April 17, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Ueda, Kenta (QMB)
Title: Anomalous tunneling of collective excitations in a Rydberg atomic system
Abstract: We study tunneling properties of low-energy excitations through a potential barrier in a spin-1/2 ferromagnetic XY model with dipole-dipole interactions, which has been realized with Rydberg atoms in an optical tweezer array [1]. In a system with spontaneous breaking of U(1) symmetry and short-range interaction, it is known that low-energy excitations exhibit anomalous tunneling behavior, in which the transmission probability increases with decreasing the excitation energy and the barrier is completely transparent at the zero-energy limit [2]. We aim to elucidate how the long-range nature of the dipole-dipole interaction affects such tunneling properties of the low-energy excitations. Specifically, within a mean field theory, we numerically calculate the transmission probability. As a result, we find that anomalous tunneling indeed occurs. We also discuss physical properties unique to the systems with long-range interactions.
[1] C. Chen et al., Nature, 616, 691 (2023).
[2] Yu. Kagan et al., Phys. Rev. Lett. 90, 130402 (2003).
Time and date: 10:45-, May 8, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Rammohan, Sidharth (QMB)
Title: TBA
Abstract: TBA
Time and date: 10:45-, May 15, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Danshita, Ippei (QMB)
Title: TBA
Abstract: TBA
Time and date: 10:45-, May 22, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Yuri, Takumi (Osaka University)
Title: TBA
Abstract: TBA
Time and date: 10:45-, May 29, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Kokubo, Haruya (CMT)
Title: TBA
Abstract: TBA
Time and date: 10:45-, June 5, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Andou, Kyousuke (CMT)
Title: TBA
Abstract: TBA
Time and date: 10:45-, June 12, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Kasamatsu, Kenichi (CMT)
Title: TBA
Abstract: TBA
Time and date: 10:45-, June 19, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Kondo, Yasushi (QC)
Title: TBA
Abstract: TBA
Time and date: 10:45-, June 26, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Miyai, Seiichirou (QMB)
Title: TBA
Abstract: TBA
Time and date: 10:45-, July 3, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: TBA
Title: TBA
Abstract: TBA
Time and date: 10:45-, July 10, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: TBA
Title: TBA
Abstract: TBA
Time and date: 10:45-, July 24, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: TBA
Title: TBA
Abstract: TBA