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<p>We demonstrate symmetry-selective control of nonlinear photoconductivity in monolayer MoSe<sub>2</sub>, where near-resonant, linearly polarized light induces transition-specific symmetry breaking and topological phase transitions without violating time-reversal symmetry. Combining Floquet theory with first-principles modeling, we show that <i>x</i>-polarized light breaks both the threefold rotation <i>C</i><sub>3</sub> and the antiunitary mirror <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\mathcal{T}}{M}_{x}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi class="MJX-tex-caligraphic" mathvariant="script">T</mi> <msub> <mrow> <mi>M</mi> </mrow> <mrow> <mi>x</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation>, whereas <i>y</i>-polarized light preserves <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\mathcal{T}}{M}_{x}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi class="MJX-tex-caligraphic" mathvariant="script">T</mi> <msub> <mrow> <mi>M</mi> </mrow> <mrow> <mi>x</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation>, enabling polarization-resolved generation of interband Berry curvature dipoles. This selective symmetry breaking yields a circular photogalvanic current whose direction and magnitude are tunable via the pump frequency, offering a direct ultrafast probe of Floquet-induced band inversion. These findings establish a viable pathway for detecting light-driven topological currents in nonchiral two-dimensional semiconductors and advancing terahertz optoelectronic applications.</p>

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Transition-selective photocurrents in Floquet-driven monolayer MoSe2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月29日

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  • Hong-Guk Min,
  • Chang Jae Roh,
  • Changyoung Kim,
  • Youngkuk Kim

摘要

We demonstrate symmetry-selective control of nonlinear photoconductivity in monolayer MoSe2, where near-resonant, linearly polarized light induces transition-specific symmetry breaking and topological phase transitions without violating time-reversal symmetry. Combining Floquet theory with first-principles modeling, we show that x-polarized light breaks both the threefold rotation C3 and the antiunitary mirror \({\mathcal{T}}{M}_{x}\) T M x , whereas y-polarized light preserves \({\mathcal{T}}{M}_{x}\) T M x , enabling polarization-resolved generation of interband Berry curvature dipoles. This selective symmetry breaking yields a circular photogalvanic current whose direction and magnitude are tunable via the pump frequency, offering a direct ultrafast probe of Floquet-induced band inversion. These findings establish a viable pathway for detecting light-driven topological currents in nonchiral two-dimensional semiconductors and advancing terahertz optoelectronic applications.