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
247 2023-01-12 14:40  E6-2 #1323  JILA 1D Wannier-Stark optical lattice clock file
246 2018-07-26 14:00  Room 5318, KAIST Natural Sciences Lecture Hall(E6).  Inflation in String Theory and Backreaction file
245 2018-07-26 14:00  Room 5318, KAIST Natural Sciences Lecture Hall(E6).  Inflation in String Theory and Backreaction file
244 2023-08-29 16:00  E6-2, #2502  [High Energy Theory Seminar] Towards string loop corrections in Calabi-Yau orientifold compactifications.
243 2020-08-17 20:00  Zoom webinar  Using magnetic tunnel junctions to compute like the brain file
242 2020-08-25 20:00  Zoom webinar  KAIST Global Forum for Spin and Beyond (Second Forum) file
241 2023-06-14 16:00  E6-2, #2502  [High-Energy Theory Seminar]Vertex algebras and extended operators in 4d N=2 SCFTs
240 2023-06-22 16:00  E6-2,1323  [High Energy Physics Seminar] The Branes Behind Generalized Symmetry Operators
239 2019-01-23 16:00  Rm. C303, Creation Hall (3F), Munji Campus  Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors file
238 2022-04-13 10:30  E6 #1323/zoom  Harnessing topology and correlations from singularities in 3d-kagome metals
237 2023-08-23 16:00  E6-2, #1322  [High Energy Theory Seminar] A spacetime tensor network for AdS3/CFT2
236 2023-01-09 16:00  E6-2 #1323  Non-Hermitian Hopf-bundle Matter. Moon Jip Park (IBS-PCS)
235 2020-12-11 14:30  online  Antisymmetric interlayer exchange coupling in magnetic multilayers
234 2024-01-24 15:00  E6-2 #1323  Determination of single molecule loading rate during mechanotransduction file
233 2020-11-26 16:00  Online(Zoom)  2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
232 2016-10-17 11:00  #1323,(E6-2, 1st fl.)  IMS and examples of the studies on optoelectronic materials
231 2019-08-19 10:00  Rm. 1322, E6-2  Tutorials on Multimode Quantum Optics in the Continuous Variable Regime file
230 2022-09-21 10:30  E6-1 #1501  [Update 세미나 영상] Distinguished Lecture 'The Magic of Moiré Quantum Matter' Prof. Pablo Jarillo-Herrero(Department of Physics, MIT) file
229 2022-08-08 14:00  E6-2 #2502  Classical Shadow Tomography for Analog Quantum Simulators
228 2020-12-09 10:00  Zoom  Searching for the QCD axion with the ARIADNE experiment file