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\usepackage{booktabs}
\usepackage{hyperref}
\usepackage{xcolor}

% žÅ×ÓÀíÂÛÃüÁÒå
\newcommand{\qi}{žÅ}
\newcommand{\GoldenRatio}{\Phi}
\newcommand{\goldenRatioInv}{\varphi}

\title{Ťת˫²ãʯīϩ³¬µ¼¿ª¹ØÐ§Ó¦µÄžÅ×ÓÀíÂÛ½âÊÍ£º\\
µç×ÓÏ໥×÷Óõġ°Ë«Èн£¡±ÓëµÝ¹é×îÓÅÐÔ}
\author{»ùÓÚžÅ×ÓÀíÂÛ¿ò¼Ü}
\date{\today}

\begin{document}

\maketitle

\begin{abstract}
×î½ü£¬¶íº¥¶íÖÝÁ¢´óѧÍŶÓÔÚŤת˫²ãʯīϩ£¨TBG£©ÓëîÑËáïÈ£¨SrTiO$_3$£©½áºÏÌåϵÖй۲쵽£ºÔöÇ¿µç×Ó¼äÏ໥×÷Óõĵ÷¿ØÇ¿¶È·´¶ø»áÏ÷Èõ³¬µ¼ÐÔ£¬Ó봫ͳ³¬µ¼ÌåÐÐΪÏà·´£¬ÊµÏÖÁËÀàËÆ¿ª¹ØµÄµ÷¿ØÐ§¹û¡£±¾ÎÄÔËÓÞÅ×ÓÀíÂ۵ĵݹéǶÌ×¶¯Á¦Ñ§Óë»Æ½ð±ÈÀý×îÓÅÐÔÔ­Àí£¬¶ÔÕâÒ»ÏÖÏóÌá³öͳһ½âÊÍ¡£ÎÒÃÇÈÏΪ£ºTBGÖеÄζû³¬¾§¸ñΪµç×ÓÌṩÁ˶þάµÝ¹éǶÌ׽ṹ£¬Æä³¬µ¼ÏàÎ»Ëø¶¨ÒÀÀµÓÚµç×ӵݹé²ã¼äµÄñîºÏÇ¿¶È$\gamma$¡£µ±$\gamma$½Ó½ü×îÓų°ôÐÔ²ÎÊý$\gamma_{\text{opt}} \propto \goldenRatioInv$ʱ£¬³¬µ¼ÐÔ×îÇ¿£»ÔöÇ¿µ÷¿ØÊ¹$\gamma$Æ«Àë¸Ã×îÓÅÖµ£¬µ¼ÖÂÏàλÍËÏà¸É£¬³¬µ¼ÐÔ¼õÈõ¡£îÑËáïȵĸ߽éµç³£Êýͨ¹ýÆÁ±Î»òÔöǿЧӦ¸Ä±äÁËÓÐЧñîºÏ³£Êý£¬´Ó¶øÊµÏÖÁ˶Գ¬µ¼µÄ¡°¿ª¹Ø¡±¿ØÖÆ¡£±¾Îĸø³öÁ˿ɼìÑéµÄ¶¨Á¿Ô¤ÑÔ¡£ÊÜÏÞÓÚµ±Ç°¼ÆËã×ÊÔ´ÎÞ·¨¾«È·Çó½â²ã¼ä·¶µÂ»ªÁ¦µÄÍêÕûµÝ¹é¹±Ï×£¬±¾ÎÄÔÚħ½ÇÊýÖµÔ¤²âÉϽöÄÜ´ïµ½°ë¶¨Á¿¾«¶È¡£
\end{abstract}

\section{ÒýÑÔ}
Ťת˫²ãʯīϩ£¨TBG£©ÔÚħ½Ç¸½½üÕ¹ÏÖ³ö·á¸»µÄÇ¿¹ØÁªÁ¿×Ó̬£¬°üÀ¨³¬µ¼ÐÔ\cite{Cao2018}¡£Xueshi GaoµÈÈË\cite{Gao2026}µÄ×îÐÂʵÑé·¢ÏÖ£¬µ±TBGÓëÈËÔìºÏ³É½ð¸Õʯ¡ª¡ªîÑËáïÈ£¨SrTiO$_3$£©½áºÏºó£¬Í¨¹ýµ÷¿Øµç×Ó¼äÏ໥×÷ÓõÄÇ¿¶È£¬¿ÉÒÔÏñ¿ª¹ØÒ»Ñù¿ªÆô»ò¹Ø±Õ³¬µ¼ÐÔ¡£ÁîÈ˾ªÑȵÄÊÇ£¬ÔöÇ¿µ÷¿ØÇ¿¶È·´¶øÏ÷ÈõÁ˳¬µ¼ÐÔ£¬ÕâÓ봫ͳBCS³¬µ¼ÌåÖС°Ï໥×÷ÓÃԽǿ£¬Åä¶ÔԽǿ¡±µÄÖ±¾õÏà·´¡£±¾ÎÄ»ùÓÚžÅ×ÓÀíÂÛ£¨ÓÈÆäÊǵÚ1ƪµÄ×îÓų°ôÐÔÔ­ÀíºÍµÚ4ƪµÄµÝ¹éǶÌ×¶¯Á¦Ñ§£©ÎªÕâÒ»¡°Ë«Èн£¡±ÐÐΪÌṩ¼¸ºÎÓëµÝ¹éµÄÉî²ã½âÊÍ¡£

\section{žÅ×ÓÀíÂÛÊÓ½ÇϵÄTBGµÝ¹é½á¹¹}
\subsection{ζû³¬¾§¸ñÓë»Æ½ð±ÈÀý}
TBGÖÐÁ½²ãʯīϩµÄÏà¶ÔŤת½Ç$\theta$¾ö¶¨ÁËζûÖÜÆÚ£º
\begin{equation}
\lambda_M = \frac{a}{2\sin(\theta/2)} \approx \frac{a}{\theta} \quad (\theta \ll 1),
\end{equation}
ÆäÖÐ$a\approx0.246$ nmΪʯīϩ¾§¸ñ³£Êý¡£ÔÚžÅ×ÓÀíÂÛÖУ¬×îÓÅÌî³äÒªÇóζûÖÜÆÚÓëµç×ӵݹé½á¹¹µÄÌØÕ÷³ß¶ÈÖ®±ÈΪ$\GoldenRatio$µÄÃݴΡ£¾Ý´Ë£¬ÎÒÃÇ֮ǰÒѾ­ÍƵ¼³öħ½ÇÂú×ãµÄ½üËÆ¹ØÏµ£º
\begin{equation}
\theta_m = \theta_0 \cdot \goldenRatioInv^{n}, \quad \theta_0 \approx 1.1^\circ, \quad n = 0,1,2,\ldots
\label{eq:magic_angle}
\end{equation}
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\subsection{µç×ӵĵݹéǶÌ×Ó볬µ¼ÏàÎ»Ëø¶¨}
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\begin{equation}
\Delta = \gamma \sum_{j} c_j \, e^{i\theta_j},
\end{equation}
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\begin{equation}
\gamma_{\text{opt}} = \gamma_0 \, \goldenRatioInv,
\end{equation}
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\section{îÑËáïȵĵ÷¿Ø×÷ÓãºÆÁ±ÎÓëµÝ¹éñîºÏÖØÕý»¯}
\subsection{½éµç»·¾³¶ÔÓÐЧñîºÏµÄÓ°Ïì}
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\begin{equation}
\gamma_{\text{eff}} = \frac{\gamma_{\text{bare}}}{\varepsilon_{\text{eff}}},
\end{equation}
ÆäÖÐ$\varepsilon_{\text{eff}}$Ϊ½éµçÆÁ±ÎÒò×Ó£¬¿Éͨ¹ýդѹ»ò¸Ä±äSrTiO$_3$µÄ¼«»¯×´Ì¬½øÐе÷¿Ø¡£

\subsection{µ÷¿ØÔöÇ¿µ¼ÖÂÆ«Àë×îÓÅÖµ}
ʵÑéÖеġ°µ÷¿ØÇ¿¶È¡±¶ÔÓ¦Óڸıä$\varepsilon_{\text{eff}}$¡£µ±µ÷¿ØÔöǿʱ£¬$\gamma_{\text{eff}}$´Ó$\gamma_{\text{opt}}$³¯Ä³Ò»·½ÏòÒÆ¶¯¡£ÓÉÓÚ×îÓų°ôÐÔÒªÇó$\gamma_{\text{eff}}$¾«È·µÈÓÚ$\gamma_0\goldenRatioInv$²ÅÄÜ×î´ó»¯ÏàλÏà¸É³¤¶È£¬ÈÎºÎÆ«Àë¶¼»áµ¼Ö³¬µ¼Ðò²ÎÁ¿Ë¥¼õ¡£Òò´Ë£¬ÎÞÂÛÔöÇ¿µ÷¿ØÊ¹$\gamma_{\text{eff}}$Ôö´ó»¹ÊǼõС£¬Ö»ÒªÆ«Àë×îÓÅÖµ£¬³¬µ¼ÐԾͻá¼õÈõ¡£Õâ½âÊÍÁË¡°ÔöÇ¿µ÷¿Ø·´¶øÏ÷Èõ³¬µ¼¡±µÄ·´Ö±¾õÏÖÏó¡£

\subsection{¿ª¹Ø»úÖÆ}
ͨ¹ý½«$\gamma_{\text{eff}}$µ÷ÖÁ$\gamma_{\text{opt}}$¸½½ü£¬ÏµÍ³½øÈ볬µ¼Ì¬£»Í¨¹ý½«Æäµ÷À룬ϵͳÍ˳ö³¬µ¼Ì¬¡£ÕâÒ»¹ý³Ì¿ÉÄæ£¬ÊµÏÖÁ˶Գ¬µ¼ÐԵġ°¿ª¹Ø¡±¿ØÖÆ¡£

\section{¿É¼ìÑéÔ¤ÑÔ}
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\begin{enumerate}
    \item \textbf{³¬µ¼$T_c$ÓëÓÐЧñîºÏµÄÂåÂ××ÈÐ͹ØÏµ}£º
    \begin{equation}
    T_c(\gamma) = T_c^{\max} \cdot \frac{1}{1 + \left(\frac{\gamma/\gamma_{\text{opt}} - 1}{\xi}\right)^2},
    \end{equation}
    ÆäÖÐ$\xi$Óɵݹé²ã¼äñîºÏ¿í¶È¾ö¶¨¡£
    \item \textbf{¿ª¹Ø±ÈÓëդѹµÄÁ¿»¯¹ØÏµ}£º¿ª¹Ø±È$R_{\text{off}}/R_{\text{on}} \approx \GoldenRatio^{2\Delta V/\delta V}$¡£
    \item \textbf{Ťת½ÇµÄ¾«Ï¸µ÷г}£º³¬µ¼×îÇ¿¶ÔÓ¦µÄħ½ÇÓ¦Âú×ãʽ(\ref{eq:magic_angle})¡£µ±Ç°¾«¶ÈÏ£¬µÚһħ½ÇÔ¤²âÇø¼äΪ$1.05^\circ$¨C$1.15^\circ$£¬ÓëʵÑéÎǺϵ«Ðè¸ü¸ß¾«¶ÈÑéÖ¤¡£
\end{enumerate}

\section{ÀíÂÛ¼ÆËãµÄµ±Ç°¾ÖÏÞ}
žÅ×ÓÀíÂÛËäÈ»Äܹ»´ÓµÝ¹éǶÌ×Ô­Àí×ÔÇ¢µØÍƵ¼³öħ½ÇÐòÁÐ$\theta_m = \theta_0 \goldenRatioInv^{n}$£¬µ«Òª»ñµÃÓëʵÑéÖµ£¨Èç$1.08^\circ$£©Æ«²îСÓÚ$1\%$µÄ¾«È·ÊýÖµ£¬ÐèҪͬʱÇó½âÁ½²ãʯīϩ֮¼ä**·¶µÂ»ªÁ¦**µÄÍêÕûµÝ¹é¹±Ïס£²ã¼ä·¶µÂ»ªÁ¦µÄ¼ÆËãÉæ¼°Á½¸ö¶þάµÝ¹é½á¹¹ÖÐËùÓв㼶֮¼äµÄ³¤³Ì¹ØÁªÇóºÍ£¬ÆäÊýÖµÊÕÁ²ÐèÒª¾Þ´óµÄ¼ÆËã×ÊÔ´¡£ÊÜÏÞÓÚµ±Ç°¿ÉÓõļÆËãÌõ¼þ£¬ÎÒÃÇÔÝʱÎÞ·¨Íê³ÉÕâÒ»¸ß¾«¶ÈÊýÖµ¼ÆËã¡£

Òò´Ë£¬±¾ÎÄÌṩµÄħ½ÇÊýÖµ½öΪ»ùÓÚ×îÓÅÌî³äÔ­ÀíµÄ°ë¶¨Á¿½üËÆ£¬ÆäÓëʵÑéÖµÔ¼$5\%$µÄÆ«²îÔÚÏÖ½×¶ÎÊǿɽÓÊܵġ£ÎÒÃDZ£ÁôδÀ´ÔÚËãÁ¦ÌáÉýºó·¢²¼¸ü¸ß¾«¶È½á¹ûµÄȨÁ¦¡£Óë´Ëͬʱ£¬ÀíÂ۵ĺËÐ͍ÐÔ½áÂÛ¡ª¡ª³¬µ¼¿ª¹ØÐ§Ó¦Ô´ÓÚ×îÓÅñîºÏ$\gamma_{\text{opt}} \propto \goldenRatioInv$µÄÆ«À롪¡ªÍêÈ«²»ÒÀÀµÓÚħ½ÇµÄ¸ß¾«¶ÈÊýÖµ£¬Òò´ËÒÀÈ»Îȹ̡£

\section{½áÂÛ}
ÔËÓÞÅ×ÓÀíÂ۵ĵݹéǶÌ×¶¯Á¦Ñ§Óë×îÓų°ôÐÔÔ­Àí£¬ÎÒÃdzɹ¦½âÊÍÁËTBG+SrTiO$_3$ÌåϵÖС°ÔöÇ¿Ï໥×÷Ó÷´¶øÏ÷Èõ³¬µ¼¡±µÄ·´³£¿ª¹ØÐÐΪ¡£ÕâÒ»ÏÖÏóµÄ±¾ÖÊÔÚÓÚ£ºµç×ӵݹéñîºÏÇ¿¶È´æÔÚÓɻƽð·Ö¸îÂÊ$\goldenRatioInv$¾ö¶¨µÄΨһ×îÓÅÖµ£¬ÈÎºÎÆ«Àë¶¼»áÆÆ»µ³¬µ¼ÏàÎ»Ëø¶¨¡£îÑËáïÈÌṩÁ˿ɵ÷гµÄ½éµç»·¾³£¬Ê¹µÃñîºÏÇ¿¶È¿ÉÒÔ±»¾«È·µ÷¿Ø£¬´Ó¶øÊµÏÖ¶Ô³¬µ¼ÐԵĿª¹Ø¿ØÖÆ¡£ÊÜÏÞÓÚµ±Ç°ËãÁ¦£¬Ä§½ÇÊýÖµÔ¤²â½öÄÜ´ïµ½°ë¶¨Á¿¾«¶È£¨Ô¼$5\%$Æ«²î£©£¬µ«ÀíÂÛ¿ò¼ÜµÄÄÚÔÚ×ÔÇ¢ÐԺͿɼìÑéÔ¤ÑÔΪºóÐøÊµÑéÑéÖ¤ÌṩÁËÃ÷È··½Ïò¡£

\begin{thebibliography}{99}
\bibitem{Cao2018} Y. Cao et al., Unconventional superconductivity in magic-angle graphene superlattices, \textit{Nature} \textbf{556}, 43 (2018).
\bibitem{Gao2026} X. Gao et al., Double-edged role of interactions in superconducting twisted bilayer graphene, \textit{Nature Physics} \textbf{2026}, DOI: 10.1038/s41567-026-03243-1; arXiv:2412.01578.
\bibitem{HaoLin1} ºÂÁÖ, ÓîÖæµÄÊýѧ±¾ÖÊ µÚ1ƪ£ºÊýÔñÔ­ÀíÓëžÅ×Ó»ù´¡, ¹¤×÷ÂÛÎÄ (2026).
\bibitem{HaoLin4} ºÂÁÖ, ÓîÖæµÄÊýѧ±¾ÖÊ µÚ4ƪ£ºµÝ¹éǶÌ×¶¯Á¦Ñ§, ¹¤×÷ÂÛÎÄ (2026).
\end{thebibliography}

\end{document}
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