visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-04-01 16:00 
일시 Apr. 1(Fri.), 04:00 PM 
장소 Zoom webinar 
연사 Dr. Kayoung Lee (KAIST) 

 

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 장소 제목
526 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
525 2019-03-21 16:00  RM. 1323, E6-2  Spring 2019: Physics Seminar Serises file
524 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
523 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
522 2022-03-29 10:00  E6 #1501/zoom, E6 #2502/zoom  Non-reciprocal phase transitions file
521 2022-03-31 10:00  E6 #1501/zoom  Weiss fields for Quantum Spin Dynamics file
520 2023-09-18 11:00  E6-2, #1322  Magic polarisation trapping of polar molecules for tunable dipolar interactions file
519 2023-04-04 16:00  Room 2501, KAIST Natural Sciences Lecture Hall(E6)  Chiral Magnetism: A Geometric Perspective
518 2023-11-15 16:00  E6-6, #119  Quantum hydrodynamic theory for plasmonics: from molecule-coupling to nonlinear optics
517 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
516 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
515 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
514 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
513 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
512 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
511 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
510 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
509 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
508 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
507 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4