Quantum Spin Pump in S=1/2 Antiferromagnetic Chains : Holonomy of Phase Operators in sine-Gordon Theory(Condensed Matter : Structure, Mechanical and Thermal Properties)

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概要

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• In this paper, we propose the quantum spin pumping in quantum spin systems where an applied electric field (E) and magnetic field (H) cause a finite spin gap to its critical ground state. When these systems are subject to alternating electromangetic fields ; (E, H)=(sin(2πt/T), cos(2πt/T) and travel along the loop Г_<loop> which encloses their critical ground state in this E-H phase diagram, the locking potential in the sine-Gordon model slides and changes its minimum. As a result, the phase operator acquires 2π holonomy during one cycle along Г_<loop>, which means that the quantized spin current has been transported through the bulk systems during this adiabatic process. The relevance to real systems such as Cu-benzoate and Yb_4As_3 is also discussed.

• 社団法人日本物理学会の論文
• 2005-04-15

著者

• Shindou Ryuichi

  Department Of Applied Physics University Of Tokyo

• Shindou Ryuichi

  Department Of Applied Physics University Of Tokyo:riken (the Institute Of The Physical And Chemical

関連論文

• Geometrical Aspects of Gigantic Magneto-Electric Effect and Quantum Pump(Cross-disciplinary Physics and Related Areas of Science and Technology)
• Quantum Spin Pump in S=1/2 Antiferromagnetic Chains : Holonomy of Phase Operators in sine-Gordon Theory(Condensed Matter : Structure, Mechanical and Thermal Properties)

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