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Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 40: 2D Semiconductors and van der Waals Heterostructures IV

HL 40.6: Vortrag

Mittwoch, 19. März 2025, 17:00–17:15, H15

Pseudo-magnetotransport simulations in strained graphene — •Alina Mrenca-Kolasinska1 and Ming-Hao Liu21AGH University, Krakow, Poland — 2National Cheng Kung University, Tainan, Taiwan

Graphene, a 2D material consisting of carbon atoms, despite its simple structure and composition can host intriguing phenomena. Application of inhomogeneous strain can lead to pseudomagnetic field (PMF), predicted to have opposite sign in the K and K 0 valley. Special strain profiles have been designed to generate uniform pseudomagnetic field in graphene [1, 2].

In this work we consider transport in pseudo magnetic field in these strain configurations. By deforming the sheet we can control the PMF, and design geometries which allow us to demonstrate interesting transport phenomena. These include electron focusing and snake states observed without external magnetic field present. For efficient modeling of quantum transport within these scenarios in large-scale systems close to realistic size devices, we extend the scalable tight-binding model [3] to accurately capture the effect of displacement field in the Hamiltonian. Our investigations open new possibilities for control over the valley degree of freedom.

[1] F. Guinea, et al., Phys. Rev. B 81, 035408 (2010).

[2] F. Guinea, M. I. Katsnelson, and A. K. Geim, Nat. Phys. 6, 30 (2010).

[3] M.-H. Liu, et al., Phys. Rev. Lett. 114, 036601 (2015).

Keywords: pseudo magnetic field; strain; tight binding; quantum transport

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