HAPPENING NOW- Thursday Colloquium

Thu Feb 8 10:32:15 EST 2024

From: The Ohio State University Department of Physics <scopel.6 at osu.edu>
Sent: Thursday, February 8, 2024 10:26 AM
To: Scopel, Carly <scopel.6 at osu.edu>
Subject: HAPPENING NOW- Thursday Colloquium

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COLLEGE OF ARTS AND SCIENCES | DEPARTMENT OF PHYSICS

Happening NOW-Spring 2024 Colloquium Series

Please join us at 11:00 AM for Colloquium with Dr. Ryo Noguchi from the California Institute of Technology.

Static and ultrafast engineering of low-dimensional quantum materials

Abstract: The discovery of quantum materials has led to significant advancements in condensed matter physics. Conventional fields such as magnetism and superconductivity were revolutionized by the concept of topology, which offers an ideal platform for realizing novel physical phenomena. To deepen our understanding of the quantum phenomena, it is crucial to search for various quantum phases and establish ways to control their properties on demand. In this presentation, I will introduce my studies on controlling low-dimensional quantum materials under equilibrium and non-equilibrium.
First, I will discuss the engineering of topological insulator phases in quasi-1D bismuth halides utilizing their stacking sequences. Among various kinds of topological insulators (TIs), strong TIs were immediately demonstrated after their theoretical prediction by observing the surface states through photoemission spectroscopy. In contrast, weak TIs and higher-order TIs remained elusive due to the experimental difficulties in detecting their boundary states. Here, I will show that quasi-1D bismuth halides offer the ideal playground to investigate and manipulate these topological phases. Utilizing a high-resolution laser and a synchrotron-based nano-beam, I have found evidence of weak and higher-order TI phases in bismuth halides depending on their stacking sequences.
Second, I will discuss the ultrafast manipulation of electronic states in a layered antiferromagnet. Here, I have explored the possibility of Floquet engineering, where an ultrafast intense electromagnetic field is applied to create or control novel quantum properties. I applied white light-based broadband transient reflection spectroscopy to the layered antiferromagnet MnPS3 and observed coherent phonon generation after Floquet driving. The relationship between the coherently excited phonons and Floquet engineering will be discussed.
Faculty Host: Fengyuan Yang
Location: 1080 Physics Research Building

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Join Us for the Colloquium and Reception
Event details:

  *   Speaker: Dr. Ryo Noguchi
  *   Reception starts at 10:45 AM, Physics Research Building Atrium
  *   Colloquium 11:00 AM- 12:00 PM, 1080 Physics Research Building
Refreshments will be provided at 10:45 AM.

[Photo of exterior of Smith Seminar Room, Physics 1080. (Location of Colloquium and Reception.)]

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