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
380 2022-05-27 11:00  Online seminar  Current Status and Future Plans of ADMX file
379 2022-05-26 16:00  E6 1323  (광학분야 특별세미나)Topological photonic devices
378 2022-05-25 16:00  E6-2. 1st fl. #1323 / Zoom  Uncovering New Lampposts for Dark Matter: Continuum or Conformal
377 2022-05-25 14:00  E6 Room(#2501)  Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file
376 2022-05-23 16:00  E6, #1501  Novel electronic transport in topological van der Waals magnets
375 2022-05-20 11:00  E6-1 #1323  (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals
374 2022-05-19 16:00  E6-2. #1323 & Zoom  Chasing Long Standing Neutrino Anomalies with MicroBooNE
373 2022-05-19 15:00  online  (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
372 2022-05-19 15:00  online  (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
371 2022-05-18 16:00  E6-2. #1323 & Zoom  Geometry, Algebra, and Quantum Field Theory
370 2022-05-16 16:00  E6, #1501  Design synthetic topological matter with atoms and lights
369 2022-05-13 16:00  자연과학동(E6-2) 1st fl. #1323  High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
368 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
367 2022-05-12 16:00  E6-2. #1323 & Zoom  New frontiers of electroweak physics at the LHC
366 2022-05-11 16:00  E6-2. #1323 & Zoom  Gravity as a phenomenon in quantum dynamics
365 2022-05-10 16:00  E6 1323  (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics
364 2022-05-09 16:00  E6, #1501  Searching for new electronic properties in correlated material flatland
363 2022-05-02 16:00  E6, #1501  What can we learn from the history of science and technology?(우리말강의)
362 2022-04-28 16:00  E6 1323  (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
361 2022-04-25 16:00  E6, #1501  Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)