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
502 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
501 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus
500 2016-07-07 14:00  #1323(E6-2. 1st fl.)  Let there be topological superconductors
499 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
498 2016-11-16 16:00  #1323(E6-2. 1st fl.)  Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
497 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
496 2018-05-31 16:00  #1323, E6-2  Dynamic control of optical properties with gated-graphene metamaterials file
495 2018-10-04 16:00  #1323, E6-2  Engineering light absorption in an ultrathin semiconductor metafilm file
494 2019-12-05 16:00  #1323, E6-2  Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell file
493 2019-10-15 16:00  #1323, E6-2  Moiré superlattices and graphene quasicrystal file
492 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
491 2019-11-05 16:00  #1323, E6-2  Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
490 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
489 2019-12-18 16:00  #1323, E6-2  Road to Higher Tc Superconductivity file
488 2018-05-09 16:00  #1323, E6-2  Recent advances in thermoelectric bulk composites file
487 2018-11-21 15:00  #1323, E6-2  Engineering topological quantum physics at the atomic scale file
486 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
485 2019-10-25 15:00  #1323, E6-2  Physics Seminar file
484 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
483 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file