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-, May 8, 2024
Room: Simulation and Experiment Room, 3rd Floor, 31 East Bldg. + Webcast via Zoom
Speaker: Rammohan, Sidharth (QMB)
Title: Studying quantum phases in dipolar Bosons in planar array using cluster mean-field
Abstract: Dipolar bosons in optical lattices have emerged as a promising candidate for the quantum simulation of the condensed matter systems. These systems have been widely employed to study phase transitions in spin models because of their tunability with regard to the interaction strengths. These prospects now motivate scientists even more to explore for interesting phases in these kinds of systems, such Luttinger liquids. A theoretical study conducted in 2008 employed dipolar bosons in planar arrays to investigate the formation of the "sliding Luttinger liquid" (SLL) phase [1]. Since it is difficult to observe the SLL phase experimentally, the main objective of this work was to propose one such platform that would allow for the observation of the SLL phase utilizing dipolar bosons.
Despite the usual challenges associated with experimental advancements, experimental research has recently accelerated, and dipolar bosons can already be realized in optical lattices in laboratories. In 2023, Griener's group investigated the formation of dipolar quantum solids in a Hubbard quantum simulator [2]. Given the current status of the research field, we think that adopting a different approach, like a cluster mean-field method, to the problem will help to develop a computationally efficient solution and open the door to studying the real-time dynamics of the systems. We believe that the cluster mean field strategy introduced in [3] will work nicely for this.
While [3] studies the phase transition in a hardcore Bose-Hubbard model, this method can also be effectively applied to the dipolar boson in planar array case.Thus, in my talk, I will be talking about this proposal, focusing mostly on the concepts of the cluster mean-field approach from [3] and the current state of the exploration of phase transition in dipole bosons in planar array. Finally, I will provide a quick summary of the cluster mean-field approach's potential for this purpose at the end of my session.
[1] C. Kollath et.al., PRL 100, 130403 (2008).
[2] Lin Su et.al., Nature 622 (2023).
[3] D. Yamamoto et.al., PRB 86, 054516 (2012).
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
Seminars in the past
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).