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)
135 2023-07-10 16:00    Electronic structures of magnetic and non-magnetic ordering in d- and f-electrons systems
134 2023-07-11 11:00    Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
133 2023-07-12 11:00    Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
132 2023-07-14 11:00    Interfaces engineering of thin film oxides
131 2023-07-18 11:00    Non-Hermitian Casimir Effect of Magnons
130 2023-07-19 16:00    [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
129 2023-07-20 16:00    [CAPP Seminar] Cosmoparticle Physics of Dark Universe file
128 2023-07-26 10:00    [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio
127 2023-08-23 16:00    [High Energy Theory Seminar] A spacetime tensor network for AdS3/CFT2
126 2023-08-24 11:00    Advancing magnonic metamaterials: spin waves in nanomagnetic arrays
125 2023-08-24 12:00    2023 가을학기 콜로키움 전체 일정 file
124 2023-08-29 16:00    [High Energy Theory Seminar] Towards string loop corrections in Calabi-Yau orientifold compactifications.
123 2023-09-07 12:00    2023 가을학기 광학분야 및 응집물리 특별세미나 전체 일정 file
122 2023-09-13 16:00    [High Energy Theory Seminar] Cosmic Birefringence from Dark Photon
121 2023-09-14 16:00    [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
120 2023-09-18 11:00    Magic polarisation trapping of polar molecules for tunable dipolar interactions file
119 2023-09-18 16:00    [CAPP Seminar] Searching for axions in quantum vacuum birefringence file
118 2023-09-21 16:00    [CAPP seminar] Axion Magnetic Resonance file
117 2023-09-26 16:00    [High Energy Theory Seminar]A new step in interacting dark sector cosmologies
116 2023-09-27 16:00    Chiral Magnets: Domain-Wall Skyrmions and String Theory Realization