Quantum magneto-transport behaviour and spin-wave dynamics in two dimensional van der Waals heterostructure

Sushant Kumar Behera and Pritam Deb*

Advanced Functional Material Laboratory (AFML), Department of Physics,
Tezpur University (Central University), Tezpur, Assam 784028, India
*Corresponding Author: pdeb[at]tezu.ernet.in

Abstract
Spin-wave ensembles in quantum regime coupled together to form an exciting prospect of observing complex behaviour interlinking the microscopic spin features with macroscopic spin ensembles [1]. This feature is quite evidence in two dimensional van der Waals heterostructure systems [2]. In those systems, spin-transfer torque plays a major role to explain the induced magneto-transport phenomenon for potential device applications [3]. The phenomenon of electron tunneling has been known since the advent of quantum mechanics, but continues to enrich our understanding of many fields of physics, as well as creating sub-fields on its own. Spin-dependent tunneling in magnetic tunnel junctions has recently aroused enormous interest and has developed in a vigorous field of research. Quantum magneto-transport phenomena is to be initiated within a short period to have a realization about the transport properties of van der Waals heterostructure. Besides, the spin conversion phenomenon is accompanied by spin-mediated phenomena like spin-transfer-torque of electronic angular momentum of the system. Spin conversion occurs at the nanoscale in the regions near the interface of two diverse varieties of materials, such as magnets, non-magnets, semiconductors and insulators. Here, we demonstrate the collective interactions in an ensemble of spin-waves to unravel the dynamics and magneto-transport studies in quantum region of van der Waals heterostructure system. We model a time-adaptive vibrational renormalization group method supported via first principle based non-equilibrium Greens function method implemented in the density functional calculations that accurately captures the underlying spin-wave dynamics and magneto-transport behaviour with positive signature of device application [4].

References

1.      H. Huang and F. Liu, Phys. Rev. Lett. 121, 126401 (2018)

2.      C. Cardoso, D. Soriano, N. A. Garcia-Martinez, and J. Fernandez-Rossier, Phys. Rev. Lett. 121, 067701 (2018).

3.      L. M. Woods, D. A. R. Dalvit, A. Tkatchenko, P. Rodriguez-Lopez, A. W. Rodriguez, and R. Podgornik, Rev. Mod. Phys. 88, 045003 (2016).

4.      S. K. Behera and P. Deb, arXiv: 1808.04418 (2019)

Acknowledgement

Department of Science and Technology, Govt. of India for DST-INSPIRE SRF Fellowship (IF150325). Tezpur University for providing HPCC Facility to perform simulation.