visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-09-02 14:30 
연사  
장소 E6-2(1st fl.), #1323 

Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction

 

Sep. 02(Fri) 2:30 PM, E6-2(1st fl.), #1323
Dr. Yong-Hyun Kim,Graduate School of Nanoscience and Technology, KAIST

 

Abstract:
Heat, a measure of entropy, is largely perceived to be diffusive and transported incoherently by charge carriers (electrons and holes) and lattice vibrations (phonons) in a material. Because heat can be carried by many different (quasi-)particles, it is generally hard to spatially localize the transport of the thermal energy. Heat transport is thus considered to be a challenging means of the local probing of a material and of its electronic states. Recently, we have shown that coherent electron and heat transport through a point-like contact in the atomic force microscope set-up at the ultra-high vacuum condition produces an atomic Seebeck effect, which represents the novel imaging principle of surface wave functions with atomic resolution. The heat-based scanning Seebeck microscopy clearly contrasts to the vacuum tunneling-based scanning tunneling microscopy, a hitherto golden standard of imaging surface wave functions. We have found that the coherent transmission probabilities of electron and phonon across the tip-sample junction are equally important for the imaging capability of the scanning Seebeck microscope. Very recently, we have reported that abnormally enhanced nanoscale friction on ice-trapped graphene surface could be understood in terms of flexural phonon couplings between graphene and substrate (e.g. mica). Also, we have found that energetic tunneling electrons in scanning tunneling microscopy can cause chemical reactions at the single molecule level by locally exciting phonon modes of molecules (or nanoscale heating) under the tip through the inelastic electron-phonon scattering. In this talk, I will discuss how we theoretically explore nanoscale thermal physics including thermoelectric imaging, nanoscale friction, and single molecule chemical reaction, specifically in the setup of scanning probe microscopy.


Contact: Sung Jae Cho, Physics Dept., (sungjae.cho@kaist.ac.kr)

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)
465 2015-12-17 11:00    Wavefront engineering for in-vivo Deep brain imaging
464 2022-12-20 16:00    Studying Baryonic Flow Across the Cosmic Scales Using Radio and Millimeter Wavelength Experiments
463 2016-10-18 15:00    “Hybrid quantum systems with mechanical oscillators”
462 2016-07-08 14:00    Electronic quasiparticles in the quantum dimer model
461 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
460 2022-04-01 16:00    High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
459 2018-11-29 16:00    양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
458 2024-03-07 16:00    [CAPP seminars] Development of Superconducting Transition Edge Sensors at SRON file
457 2021-06-11 16:00    Pseudogap in surface-doped black phosphorus file
456 2016-11-11 13:30    Bandgap Engineering of Black Phosphorus
455 2016-04-01 14:30    Interference of single charged particles without a loop and dynamic nonlocality
454 2016-05-31 16:00    Understanding 3D tokamak physics towards advanced control of toroidal plasma
453 2023-07-18 11:00    Non-Hermitian Casimir Effect of Magnons
452 2024-06-13 16:00    Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
451 2023-09-14 16:00    [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
450 2018-05-11 14:30    Disordered Floquet topological insulators file
449 2016-12-09 16:00    Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
448 2022-05-13 14:30    Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
447 2021-07-29 14:00    Gravitationally Induced Dark Sector and Inflationary Dynamics file
446 2015-12-11 13:30    Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9