visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-04-01 16:00 
연사  
장소 Zoom webinar 

 

SRC Seminar

 

 

High-field Electron Transport and Interaction Induced Phenomena in 2D Materials

 

Dr. Kayoung Lee

Electrical Engineering, KAIST

 

Apr. 1 (Fri.), 04:00 PM

https://kaist.zoom.us/j/89879980781
회의 ID: 898 7998 0781

암호: 808795

 

 

 

Abstract:

In this talk, I will present our research that spans from fundamental electron transport mechanisms to interaction induced phenomena in low-dimensional electron systems, each of which is in dire need of

innovation to incubate new material-based devices with high performance. Using double bilayer graphene heterostructures, separated by a hexagonal boron nitride dielectric, we studied interactions

between the two bilayers, where the interlayer spacing is smaller than the intra-layer particle spacing. I will present frictional drag probed on the double bilayer systems, a phenomenon in which charge current

flowing in one (drive) layer induces a voltage drop in the opposite (drag) layer. At temperatures (T) lower than 10 K, we observe a large anomalous negative drag near the drag layer charge neutrality, which increases dramatically with reducing T, strikingly becoming comparable to the layer resistivity at the lowest T = 1.5 K. A comparison of the drag resistivity and the drag layer Peltier coefficient suggests a thermoelectric origin of the drag. The talk will then move on to our recent investigation into electron transport and drift velocity saturation at high electric field in emerging 2D InSe semiconductor with a mobility >2700 cm2/Vs at room temperature. I will report the first measured saturation velocity of 2D InSe exceeding 2 x 107 cm/s. Employing our modified optical phonon emission model to explain the drift velocity saturation at high electric field, we estimate the energy of InSe optical phonons.

 

 

Contact: SunYoung Choi, (sun.0@kaist.ac.kr)

Center for Quantum Coherence in Condensed Matter, KAIST

 

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)
505 2012-04-02 16:00    A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
504 2024-11-18 10:30    Manipulation of antiferromagnetic magnon polarization in synthetic antiferromagnets
503 2020-12-10 13:55    Consistency of Boltzmann equation and light dark matter from inflaton decay
502 2016-09-05 16:00    Physics Colloquium : 2016 Fall file
501 2024-07-03 16:00    [High Energy Theory Seminar] Holographic duals of Higgsed Dpb(BCD)
500 2021-01-28 15:00    Topological Transport of Deconfined Hedgehogs in Magnets file
499 2018-12-26 16:00    Informal Workshop on Topology and Correlation file
498 2021-06-22 17:00    Spintronics meets Quantum Materials file
497 2024-12-06 16:00  Vladimir Y. Chernyak  Bright Squeezed Light (BSL) Spectroscopy with Interferometry from First Principles
496 2021-06-08 10:00    Photonic crystal devices for sensing file
495 2023-06-30 11:00    The Dual Mode Quantum Computer file
494 2023-11-29 10:00    [High Energy Theory Seminar] Averaged null energy and the renormalization group
493 2020-09-14 17:30    KAIST Global Forum for Spin and Beyond (Third Forum) file
492 2024-11-13 12:00    [11/13(수) 물리학과 세미나 안내] Separability as a window to mixed-state quantum phases and phase transitions / Tarun Grover (UC San Diego, Associate Professor)
491 2022-11-03 13:00    [High-Energy Theory Seminar] Supersymmetric observables via Fermi-gas method
490 2024-10-31 13:00    Mini-workshop on first-principles DFT methods and applications
489 2019-07-08 14:00    Ultrabroadband squeezed pulses and their relation to relativity file
488 2023-04-05 16:00    [High Energy Theory Seminar]Anomalies of Discrete 1-Form Symmetries in QCD-like Theories
487 2024-03-27 16:00    [High Energy Theory Seminar] The Callan Rubakov Effect
486 2023-02-20 17:00    (Optics Seminar) Neural Holography for Next generation Virtual and Augmented Reality Displays file