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초청 발표

양희준 교수

카이스트 물리학과

Atomic-scale thermopower in 2D topological and correlated materials

 

Heejun Yang1,*

 

1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST); Daejeon, 34141, Republic of Korea.

*h.yang@kaist.ac.kr

 

Thermoelectricity (i.e., thermopower generation) has been investigated mainly on the macroscopic scale despite its origin being linked to materials' local electronic band structure. Recently, the microscopic origins of thermopower have gained attention in the design of novel and efficient thermoelectric devices. In particular, distinct origins for thermopower have been expected with low-dimensional, strongly correlated, and topological materials. In this presentation, I will demonstrate our findings on thermoelectric puddles [1,2], phonon puddles [3], and thermal biasing effects to break the atomic lattice symmetry [4] in variously stacked graphene and 1T-TaS2, using our Scanning ThermoElectric Microscopy (SThEM). Based on the sensitive probe of the local density of states’ derivatives in SThEM, harnessing atomic-scale thermopower can be achieved above room temperature, distinguished from conventional low-temperature studies with scanning tunneling microscopy.

 

[1] M. Zhao et al., Nano Letters 19, 61 (2019)

[2] M. Zhao et al., ACS Nano 15, 5397 (2021)

[3] D. Kim et al., Nature Communications 13, 4516 (2022)

[4] D. Kim et al., Nature Communications 16 ,1879 (2025)

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