Chapter 10: Physical Review Letters and the Empty Mailbox
Days quietly slipped by within Caltech's seemingly unchanging rhythm.
During the day, David immersed himself in lab work and office duties; evenings, he hung out with his friends and colleagues.
Encouraged by Leonard and the others, he finally took that forward-thinking idea about topological insulator transport measurements—which he'd proposed during his "showdown" with Sheldon—and meticulously organized and expanded it into a complete draft paper.
He knew that obtaining data perfectly supporting his theory would be extremely difficult given 2007's experimental limitations. So he cleverly positioned it as a prospective paper focusing on "Theory and Experimental Methodology."
The paper's core argument wasn't presenting ironclad data, but boldly proposing a new analytical framework: when facing complex scattering mechanisms in topological insulators (like the difficulty distinguishing phonon scattering from magnetic impurity scattering), traditional single-variable measurements might be insufficient.
Instead, employing multi-parameter space scanning (like systematic combinations of parallel magnetic field B‖ and vertical gate voltage Vg) combined with emerging pattern recognition algorithms might provide a more powerful, universal solution for isolating different scattering mechanism contributions.
Simply put, traditional experimental methods were like trying to fix all the different shaped screws inside a complex machine using only one tool—ineffective and prone to causing damage.
David's paper argued we should wheel in an entire toolbox containing various screwdrivers, wrenches, and even inspection cameras (multi-parameter scanning), then bring in a sharp-eyed master mechanic (pattern recognition algorithm) to examine everything.
By observing how the screws reacted under different tool combinations (data variations), the mechanic could more accurately determine which screw was stripped and which was cross-threaded, thereby finding more appropriate repair methods.
The paper's focus wasn't how many machines had already been fixed, but demonstrating that this "new tool combination + expert mechanic" approach was extraordinarily powerful with infinite future potential.
He cautiously used the term "pattern recognition algorithm," avoiding direct introduction of "machine learning"—a concept that hadn't yet gained traction in physics circles in 2007.
He managed to obtain some preliminary experimental data from colleagues at a collaborating lab—imperfect data showing faint trends—to support his framework's feasibility.
After repeated revisions and polishing, David, feeling both excited and nervous, submitted the paper through the online system to the top physics journal, Physical Review Letters (PRL).
The following days became textbook "waiting for Godot" torture.
David developed a habit of refreshing his email dozens of times daily. Even the peeling paint mailbox at the Caltech Physics Department entrance became his daily "pilgrimage site."
That afternoon, as the workday ended, David, Leonard, Sheldon, Howard, and Raj walked toward the parking lot together.
Passing the department building entrance, David habitually detoured, skillfully opened the small compartment bearing his name, and found it still empty. He sighed and gently closed the door.
"I don't understand," Sheldon finally spoke, his tone dripping with impatience. "Your paper was submitted through an online system. Receipt confirmation, editor assignment, even peer review feedback will, without exception, arrive via email.
There's zero logical basis for them sending acceptance or rejection notices via physical mail. So why must we waste a precious 73 seconds daily on this meaningless ritual of checking an empty metal box?"
David explained, "Sheldon, this is my first truly significant paper since arriving at Caltech, so naturally I value it. Checking the physical mailbox—first, it's just in case, since systems can glitch. Second..." He paused, his tone tinged with longing,
"If I could receive a letter from PRL, printed on official letterhead with an editor's signature, wouldn't that physical texture, that sense of ceremony holding it, be more worth treasuring than a cold email? It's a keepsake."
Sheldon scoffed, his tone mixing superiority with pity. "Oh, you apparently harbor considerable confidence regarding your paper's prospects. Very well, maintain that mindset. Let's hope the content of that 'ceremonial' letter doesn't shatter your precious emotions when it arrives."
"David, ignore him," Leonard immediately countered, offering comfort. "Top journals like PRL are extremely careful about papers that might open new directions.
Your method is not only novel but offers a completely fresh perspective and toolset for solving old problems.
I bet the editors are currently debating internally or hunting for reviewers who are both authoritative and sufficiently open-minded to evaluate your work. A long wait often means they see massive potential, not that they're planning to reject it easily. That's a good sign."
Howard chimed in, attempting to "comfort" him in his signature way. "Exactly, buddy. Think about it: if your paper gets accepted, you can frame the acceptance letter and hang it on your wall. How many women will think you're brilliant because of that... assuming, of course, they first understand what a topological insulator is." He shrugged.
Raj added, "And... the waiting process itself is sweet torture, right? Like waiting for your first crush to text back." After saying this, he seemed to find it overly sentimental, stepped back slightly, and scratched his head.
Everyone piled into Leonard's car. Leonard started the engine but, instead of driving toward the apartment, turned onto a different street.
Sheldon immediately noticed the route deviation. "Leonard! Your navigation has a serious error! This isn't the route home! According to the schedule, it's Wednesday evening, and we should be returning to the apartment to enjoy my homemade Three-Cheese Penne, which adheres to the Wednesday Menu Protocol!"
Leonard gripped the steering wheel, his tone carrying a hint of pleading. "Sheldon, listen, the Cheesecake Factory also has pasta.
They've got Spaghetti Bolognese, Chicken Parmesan, Shrimp Scampi Linguine... all kinds of stuff. Didn't we just eat there last night? You even accepted their loaded potato soup and burgers.
That means the Cheesecake Factory has been added to your 'Database of Acceptable Dining Establishments.' Can't we just switch up the menu tonight? Just this once?"
Sheldon's expression suggested he'd just heard the most absurd proposition in existence. His eyes widened, voice rising with shock. "Have you only known me for one day,
Leonard Hofstadter? Replacing the fixed, perfectly calculated, nutritionally and flavor-optimized Three-Cheese Penne for Wednesday with the Cheesecake Factory's 'alternative pasta'—where ingredient ratios are unknown, sauce consistency is questionable, and cooking time depends on the chef's mood? Good Lord! Listen to yourselves!
Why don't we just change pi to 3.2 to simplify calculations? Why don't we decree all planets must orbit in perfect circles to spare Kepler the effort? Why don't we just declare chaos theory the sole truth of the universe?! Now, turn around immediately, take me back to the apartment so I can prepare my penne, and after that, I don't care what you people eat!"
Leonard was also provoked, retorting stubbornly. "Turn around? Sheldon, the Cheesecake Factory is literally between campus and our apartment! I am not driving back to the apartment first just to turn around and come back for dinner! You have two choices:
One, come with us to the Cheesecake Factory, sit there while we eat, then we all go home together. Two, get out right now and Uber back to the apartment yourself. Whether you get to eat your precious penne on schedule tonight, I don't care! You choose!"