Manipulating Quantum Spins by a Spin-Polarized Current: An Approach Based Upon PT-Symmetric Quantum Mechanics

Abstract

We propose a quantum processor based upon single-molecule magnets and spin transfer torque described by PT-symmetric quantum mechanics. In recent years PT-symmetric Hamiltonians have been used to obtain stability thresholds of various systems out of equilibrium. One such problem is the magnetization reversal due to the spin transfer torque generated by a spin-polarized current. So far the studies of this problem have mostly focused on a classical limit of a large spin. In this work we are discussing spin tunneling and quantum dynamics of a small spin induced by a spin polarized current within a PT-symmetric theory. This description can be used for manipulating spin qubits by electric currents.

arXiv comment8 pages, 7 figures

References in corpus (13)

• Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry
• Spin Transfer Torques
• PT-Symmetric Quantum Mechanics
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Nonlinear waves in $\mathcal{P}\mathcal{T}$-symmetric systems
• Electric field control of deterministic current-induced magnetization switching in a hybrid ferromagnetic/ferroelectric structure
• Magnetic qubits as hardware for quantum computers
• Single-molecule Nanomagnets
• The Semiclassical Propagator for Spin Coherent States
• Parity-time symmetry breaking in magnetic systems
• Comparison of quantum and classical relaxation in spin dynamics
• Current-driven domain wall motion across a wide temperature range in a (Ga,Mn)(As,P) device
• Generation and Detection of Spin Currents in Semiconductor Nanostructures with Strong Spin-Orbit Interaction

Cited by in corpus (2)

• Spintronics meets density matrix renormalization group: Quantum spin torque driven nonclassical magnetization reversal and dynamical buildup of long-range entanglement
• Effects of the dynamical magnetization state on spin transfer