Read .csv file in R

Question

I am a beginner to R, I have a file like below.

state            population
Alabama             4779736
Alaska               710231
Arizona             6392017   
Delaware             897934
District of Columbia 601723

I saved it in notepad as "tab1.csv", then I use read_csv to read in R with

tab1 <- read_csv("tab1.csv")
tab1  

and the data after read like this:

tab1
# A tibble: 5 x 1
 `state   \t     population`   
  <chr>                         
1 "Alabama             4779736" 
2 "Alaska     \t         710231"
3 "Arizona    \t        6392017"
4 "Delaware     \t     897934"  
5 "District of Columbia 601723" 

My question is what "\t" mean and how to read this data and I hope I can get exact as input.
Thank you very much.